Enzymes are proteins that lower the activation energy of reactions in the body.

Which statement is true?

Responses

They increase the reaction rate by increasing the concentration of reactants.

They increase the surface area of the molecules.


They increase the reaction rate by decreasing the concentration of products.

They increase the reaction rate by acting as catalysts.

a. The number of moles of acid in the original sample is 0.00369. b. The molar mass of the organic acid is 0.135  M. c. The molarity of the unreacted HA remaining in the solution at pH 5.65 is 0.045 M

Calculation:

a. The equivalence point was reached after the addition of 27.4 mL of the 0.135 M NaOH.a.

Moles of NaOH = M × V = 0.135 M × 27.4 mL = 0.00369 moles

Using the balanced equation, we find that the number of moles of HA is equal to the number of moles of NaOH at the equivalence point. HA + NaOH → NaA + HOH0. 00369 moles of NaOH are needed to react with 0.00369 moles of HA.

b. Molar mass of HA = (mass of HA) / (number of moles of HA) = 0.682 g / 0.00369 moles = 184.7 g/molc. Calculate the molarity of the unreacted HA remaining in the solution at pH = 5.65.The pH of the solution was 5.65 after 10.6 mL of NaOH were added.

c. To calculate the molarity of the remaining HA, we first need to find the pKa of the acid.

pH = pKa + log([A-]/[HA])5.65 = pKa + log([A-]/[HA]). We know that at the equivalence point, [A-] = [HA] / 2.

Therefore,[A-] = 0.00369 moles / 2 = 0.00185 moles[Ligand] = (moles of ligand) / (liters of solution). We need to find [HA] in moles/L, so we need to find [A-] in moles/L. We can use the molarity of the NaOH solution to do this. [NaOH] = 0.135 M

moles of NaOH = [NaOH] × (liters of solution)moles of NaOH = 0.135 M × 0.0106 L.

moles of NaOH = 0.00144 moles

moles of HA at pH = 5.65 = moles of HA initially - moles of NaOH added = 0.00369 moles - 0.00144 moles

= 0.00225 moles[HA] = 0.00225 moles / 0.050 L = 0.045 M

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The volume of NaOH solution used in the titration is 22.50 mL or 0.0225 L. The molarity of the NaOH solution is 0.210 mol/L.

To determine the molarity of the NaOH solution, we can use the balanced chemical equation for the reaction between NaOH and KHP:

NaOH + KHP → NaKP + H2O

From the equation, we can see that one mole of NaOH reacts with one mole of KHP. Therefore, the number of moles of NaOH used in the titration can be calculated by:

moles NaOH = molarity of NaOH solution × volume of NaOH solution used (in liters)

The volume of NaOH solution used in the titration is 22.50 mL or 0.0225 L.

To calculate the molarity of the NaOH solution, we need to determine the number of moles of NaOH used in the titration. From the balanced equation, we can see that one mole of KHP reacts with one mole of NaOH. The mass of KHP used in the titration is 0.969 g, which corresponds to the number of moles of KHP used:

moles KHP = mass of KHP / molar mass of KHP

= 0.969 g / 204.22 g/mol

= 0.004738 mol

Since the stoichiometry of the reaction is 1:1, the number of moles of NaOH used in the titration is also 0.004738 mol. Substituting these values into the above equation, we get:

0.004738 mol = molarity of NaOH solution × 0.0225 L

Solving for the molarity of the NaOH solution, we get:

molarity of NaOH solution = 0.004738 mol / 0.0225 L

= 0.210 mol/L

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Answer: The most likely base is an amine or an organic base with a pKa value of approximately 6.4.

To determine the most likely base, one must examine the shape of the titration curve obtained from the titration of 1.000 g of a weak base with HCl. The shape of the curve would give an insight into the identity of the weak base.

The following information can be deduced from the given titration curve: The equivalence point (stoichiometric point) is located at approximately pH 6.4. This corresponds to the neutralization of the weak base with HCl to form the salt of the weak base.

At pH <6.4, the weak base is partially protonated (acidic) and exists in a conjugate acid form. When the pH is greater than 6.4, the weak base is partially deprotonated (basic) and exists in the conjugate base form.

In conclusion, the most likely base is an amine or an organic base with a pKa value of approximately 6.4.

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The compounds containing anions from the most basic to least basic are:1) B (Strongest base)2) C3) A (Weakest base)The order of basicity of anionic compounds can be determined using the periodic table. The correct answer is B>C>A.

Anions are larger than their corresponding atoms due to the addition of one or more electrons. As a result, anions have lower effective nuclear charges and therefore are more basic than their parent atoms. The larger the anion, the more basic it is. The order of basicity of anionic compounds is as follows:

B > C > A

Where, B is the most basic anionic compound, C is the second most basic anionic compound, A is the least basic anionic compound

Therefore, the order of the anionic compounds from the most basic to least basic is B > C > A. To order the anionic compounds from the most basic to least basic, follow these steps: Identify the anions present in each compound., Determine the conjugate acid of each anion, Compare the strength of the conjugate acids, Order the anionic compounds based on the strength of their conjugate acids (the weaker the conjugate acid, the stronger the base).

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b. Therapeutic. For treatment dosage therapy, the therapeutic anti-Xa level is between 0.5 and 1 units/mL. For prophylactic dosage treatment, the ideal anti-Xa level is between 0.2 and 0.4 units/ml.

The activity of heparin, including low molecular weight heparin, is measured using the anti-Xa assay. Anti Xa is an ambiguous name. Heparin activity is what the lab truly reports when it says "against Xa." Therefore, low anti-Xa correlates with lower heparin activity, whereas high Xa correlates with higher heparin activity. The medicine and the indication both affect the therapeutic anti-Xa activity. Unfractionated heparin has a different range than low molecular weight heparin. For the treatment of venous thromboembolism, a therapeutic range for unfractionated heparin is 0.35–0.7 and for low molecular weight heparin, it is 0.5–1. 10% less is the suggested goal for acute coronary syndrome.

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Complete Question:

A sample is sent to the laboratory for an anti-Xa assay. The result of the PTT is 65.7 seconds. The result of the anti-Xa assay is 0.9 U/mL of heparin. The patient is on Lovebox. Their anti-Xa level is:

a. subtherapeutic

b. therapeutic

c. supratherapeutic

d. prophylactic

The solubility of KHT (solid) in pure water compared with the solubility of KHT (solid) in a 0.1 M KCl solution is predicted to be higher in the 0.1 M KCl solution. This is because the KCl solution has a higher ionic strength, increasing the solubility of ionic compounds like KHT.

Let's understand this in detail:

What is solubility?

Solubility is defined as the ability of a substance to dissolve in a particular solvent under certain conditions. It measures the maximum amount of solute that can be dissolved in a given amount of solvent at a particular temperature, pressure, and other conditions.

Solubility of KHT in pure water:

KHT (Potassium hydrogen tartrate) is a weak acid salt that has low solubility in pure water. The solubility of KHT in pure water is affected by various factors such as temperature, pH, and pressure. The solubility of KHT in pure water is around 4.4 g/L at room temperature.

Solubility of KHT in 0.1 M KCl solution: The solubility of KHT in a 0.1 M KCl solution is predicted to be higher than in pure water. KCl is an ionic salt dissociating in water to produce K+ and Cl- ions. The presence of KCl increases the ionic strength of the solution. This ionic strength improves the solubility of other ionic compounds, such as KHT. KHT has a higher solubility in a 0.1 M KCl solution than in pure water due to this reason.

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Answer: the formula 2n2 :)

Explanation: To calculate the maximum number of electrons in each energy level, the formula 2n2 can be used, where n is the principal energy level (first quantum number). For example, energy level 1, 2(1)2 calculates to two possible electrons that will fit into the first energy level.

I hope it helped! :)

The electron configuration of Helium (He) is 1s², which means that it has two electrons in its outermost shell.

Helium is an inert gas and, like hydrogen, it also emits a line spectrum when it is energized.Helium has a more complex spectrum than hydrogen because it has more electrons.

As a result, it emits more lines than hydrogen. Helium has two electrons, which implies that it will have twice the number of lines than hydrogen.

The emission spectrum of helium will have more lines than that of hydrogen because helium has more electrons.

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Monitoring the temperature of the oil prior to adding the potassium methoxide solution is essential for predicting and controlling the reaction rate, as well as ensuring the safety of the process.

The temperature should be monitored with an accurate thermometer and recorded periodically to make sure it is not rising or falling significantly.

Calibrating the thermometer regularly is also important for obtaining accurate readings.

It is important to monitor the temperature of the oil prior to adding the potassium methoxide solution for several reasons.

Firstly, the addition of potassium methoxide into oil can cause a rapid exothermic reaction, which is the release of energy in the form of heat.

The rate of this reaction is largely dependent on temperature, so having accurate temperature readings is important for predicting and controlling the reaction.

Additionally, overheating can cause the potassium methoxide to decompose, which can lead to undesired products and potentially hazardous conditions.

Therefore, monitoring temperature is critical in ensuring the safety of the reaction.

In order to monitor temperature accurately, it is important to have an appropriate thermometer and have a general understanding of the expected temperature range for the reaction.

The thermometer should be inserted into the oil to a predetermined depth and left there for a predetermined period of time in order to get an accurate reading.

The temperature should be recorded periodically to make sure it is not rising or falling significantly. Additionally, the thermometer should be calibrated regularly to ensure that it is providing accurate readings.

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To calculate the Gibbs free energy change (ΔG_rxn) for the reaction at -73°C under the given standard conditions at equilibrium and pH 2, we would need the specific reaction equation, as well as the standard free energy change (ΔG°) and equilibrium constant (K) for that reaction.

Once we have those, we can use the equation ΔG_rxn = ΔG° + RTlnQ, where R is the gas constant, T is the temperature in Kelvin, and Q is the reaction quotient. However, without the specific reaction details, we cannot calculate ΔG_rxn.

To further elaborate, the Gibbs free energy change (ΔG_rxn) is a measure of the spontaneity of a chemical reaction, and it can tell us whether a reaction will occur spontaneously or not.

The ΔG_rxn can be calculated using the equation ΔG_rxn = ΔG° + RTlnQ, where ΔG° is the standard free energy change of the reaction at standard conditions (usually 298 K and 1 atm), R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin, and Q is the reaction quotient.

The reaction quotient (Q) is the ratio of the concentrations of the products to the concentrations of the reactants at any given point in the reaction. Under standard conditions, the reaction is at equilibrium, and the reaction quotient (Q) equals the equilibrium constant (K).

If Q < K, then the reaction will proceed spontaneously in the forward direction to reach equilibrium, and ΔG_rxn will be negative.

If Q > K, then the reaction will proceed spontaneously in the reverse direction to reach equilibrium, and ΔG_rxn will be positive. If Q = K, then the reaction is at equilibrium, and ΔG_rxn will be zero.

However, to calculate the Gibbs free energy change (ΔG_rxn) for a specific reaction, we need to know the specific reaction equation, as well as the standard free energy change (ΔG°) and equilibrium constant (K) for that reaction.

These values can be experimentally determined or obtained from reference tables. Therefore, without the specific reaction details, we cannot calculate ΔG_rxn.

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One way that the layers of the atmosphere help to maintain life on Earth is by absorbing and scattering harmful solar radiation, such as ultraviolet (UV) radiation.

The ozone layer, which is located in the stratosphere layer of the atmosphere, absorbs most of the Sun's harmful UV radiation, preventing it from reaching the Earth's surface where it can cause DNA damage and skin cancer. Additionally, the atmosphere helps regulate the Earth's temperature by trapping heat from the Sun through the greenhouse effect, which is essential for maintaining a stable and habitable climate. The atmosphere also contains oxygen, which is necessary for the survival of many living organisms.

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The C-Cl bond in the [tex]CCl_4[/tex] molecule is polar because the electronegativity difference between C and Cl is greater than 0.5. Since [tex]CCl_4[/tex] is tetrahedral in shape and symmetrical, the individual bond dipoles cancel each other out and the molecule is nonpolar overall.

The polarity of a bond in a molecule is determined by the electronegativity difference between the atoms that comprise the link. The larger the difference in electronegativity, the more polar the bond. In the case of [tex]CCl_4[/tex], chlorine has a higher electronegativity than carbon, resulting in a polar covalent bond between them.

Despite the polarity of the C-Cl bonds, the molecule as a whole is nonpolar due to its tetrahedral structure and symmetry. When a tetrahedral molecule like [tex]CCl_4[/tex] is considered as a whole, the bond dipoles formed by the polar bonds cancel each other out. This occurs because the four C-Cl bonds are symmetrically formed in a tetrahedral geometry around the carbon atom, with the same bond angle and bond length.

As a result, the total dipole moment of [tex]CCl_4[/tex] is zero, and the molecule has no overall dipole moment. [tex]CCl_4[/tex] is thus a nonpolar molecule despite the presence of polar bonds.

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The pH of a solution is 3.94 (option 2).

The pH of a solution that is 0.410 m in HOCI and 0.050 m in NaOCI can be determined by the following steps. The equation for the ionization of HOCI is given as follows:

HOCI + H2O ↔ H3O+ + OCI-The acid dissociation constant, Ka for the above equation is 1.2 × 10-8. We assume that the reaction is at equilibrium.

The equilibrium expression for the given equation is given below:Ka = [H3O+][OCI-]/ [HOCI]Initially, the concentration of HOCI and NaOCI is the same. Therefore, [HOCI] = 0.410 M and [OCI-] = 0.050 M.

The HClO is the acid and the ClO is the base. HClO is converted into ClO-.Consequently, the initial [H3O+] = 0 and the initial [ClO-] = 0. The equilibrium concentration of [H3O+] will be equal to [ClO-].

Let x be the change in concentration for H3O+ and OCI-. Therefore, we can write the expression for equilibrium concentrations as follows: [HOCI] = 0.410 - x [OCI-] = 0.050 - x [H3O+] = x [ClO-] = x

The equilibrium expression can be written as follows:Ka = [x][x]/ [0.410 - x] [0.050 - x]Ka = x²/ [0.410 - x] [0.050 - x]We can simplify the above equation by ignoring the x terms as it is less than 5% of the initial concentration.

Therefore, x = [H3O+] = [ClO-] = 1.95 × 10-3Thus, the pH of the solution can be determined as follows:pH = -log[H3O+]pH = -log[1.95 × 10-3]pH = 2.71Thus, the correct option is 2. 3.94.

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Total concentration of sodium ions is 3.00 moles/liter.

The concentration of sodium ions in a solution containing 0.750 moles of sodium sulfate dissolved in 0.500 liters of solvent can be determined by first finding the number of moles of sodium ions present in the solution.

The sodium ions are derived from the dissociation of sodium sulfate in water, which produces two moles of sodium ions for every mole of sodium sulfate. Since there are 0.750 moles of sodium sulfate in the solution, there are 1.5 moles of sodium ions present in the solution.

To calculate the total concentration of sodium ions, divide the number of moles of sodium ions by the volume of the solution in liters:Total concentration of sodium ions = moles of sodium ions / liters of solution

Total concentration of sodium ions = 1.5 moles / 0.500 liters = 3.00 moles/liter

Therefore, the total concentration of sodium ions present in the solution is 3.00 moles/liter.

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The statement that is correct about activation energy is that it is low for reactions that take place rapidly.

Activation energy refers to the least amount of energy needed for a reaction to take place. It is the amount of energy required to form an activated complex that breaks the bonds of reactants to form products.The significance of activation energy is that it provides information about the speed of chemical reactions. Reactions with high activation energy are slow, whereas those with low activation energy are rapid. The activation energy also determines the effectiveness of catalysts, which are substances that lower the activation energy of a reaction, allowing it to proceed more rapidly.

The Arrhenius equation is a mathematical equation that shows the dependence of reaction rate on temperature. The equation is expressed as:

[tex]k=Ae^{{\frac {-E_{a}}{RT}}}[/tex]

Where: k is the rate constant of the reaction, A is the frequency factor (a constant that depends on the reaction), Ea is the activation energy of the reaction, R is the gas constant, T is the temperature.

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If the astronomer's claim is correct and igneous rock was formed from material that was originally in sedimentary rock on the surface of Acer, then the process that likely occurred is called "igneous intrusion."

Igneous intrusion happens when molten rock, known as magma, is forced into layers of sedimentary rock, which is formed from the accumulation of sediments like sand, mud, or organic matter. As the magma intrudes into the sedimentary rock, it heats up the surrounding rocks and causes them to partially melt and recrystallize. Over time, as the magma cools and solidifies, it forms igneous rock.

The process of igneous intrusion can also cause the sedimentary rock layers to fold or deform, creating features like faults, folds, and uplifts. These changes in the sedimentary rock can be used by geologists to understand the history and geology of a particular region.

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Answer:

The octet rule is a guideline that suggests that atoms tend to combine in a way that allows each atom to have eight electrons in its outermost energy level (except for hydrogen, which is stable with two electrons). However, there are some molecules that do not obey the octet rule. Here are two common types of exceptions and examples of molecules that fall into each category:

Incomplete Octet: In this type of exception, the atoms in the molecule do not have a complete octet of valence electrons. Examples of molecules that have incomplete octets include beryllium chloride (BeCl2) and boron trifluoride (BF3).

In beryllium chloride, beryllium has only four valence electrons, while chlorine has seven. When the two atoms combine, beryllium shares its electrons with two chlorine atoms, but it still has only four electrons around it, which is fewer than the octet rule suggests. In boron trifluoride, boron has only three valence electrons, while fluorine has seven. When the two atoms combine, boron shares its electrons with three fluorine atoms, but it still has only six electrons around it, which is also fewer than the octet rule suggests.

Expanded Octet: In this type of exception, the atoms in the molecule have more than eight valence electrons. Examples of molecules that have expanded octets include sulfur hexafluoride (SF6) and phosphorus pentachloride (PCl5).

In sulfur hexafluoride, sulfur has six valence electrons, while each of the six fluorine atoms has seven valence electrons. When the atoms combine, sulfur shares its electrons with all six fluorine atoms, resulting in a total of 12 electrons around the sulfur atom, which is more than the octet rule suggests. In phosphorus pentachloride, phosphorus has five valence electrons, while each of the five chlorine atoms has seven valence electrons. When the atoms combine, phosphorus shares its electrons with all five chlorine atoms, resulting in a total of 10 electrons around the phosphorus atom, which is also more than the octet rule suggests.

In both cases, the atoms in these molecules are able to deviate from the octet rule due to the availability of empty d orbitals in the central atom that can accommodate additional electrons beyond the octet. Additionally, the size and electronegativity of the atoms involved in the bonding also play a role in determining whether the molecule will obey the octet rule or not.

Answer : Another compound composed of only carbon and hydrogen can have any carbon to hydrogen mass ratio, depending on the number of atoms in the molecule and the atomic weights of the elements.

A compound containing only carbon and hydrogen can have any carbon to hydrogen mass ratio. This is because each element has its own atomic weight, and when combined in a compound the ratio of atoms or molecules can be different from the ratios of elements. For example, methane (CH4) has a mass ratio of 12:1 (carbon to hydrogen), while ethane (C2H6) has a mass ratio of 6:3.

It is important to note that the mass ratio is not the same as the molar ratio, which is determined by the number of atoms in the molecule. For example, ethylene (C2H4) has a molar ratio of 1:2, but its mass ratio is 6:4.

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The molality of dichloromethane in this solution is 6.25 m.

The molality of dichloromethane in a solution of dichloromethane and 2-pentanone is calculated using the formula:

molality (m) = moles of solute (mol) / kilograms of solvent (kg)

In this case, the solute is dichloromethane (CH₂Cl₂) and the solvent is 2-pentanone (CH₃COC₃H₇). The mole fraction of dichloromethane is 0.350, so there are 0.350 moles of dichloromethane in one mole of the solution.

To get the mass of solvent, we need to convert the number of its moles to mass by multiplying it with its molar mass. The molar mass of 2-pentanone (CH₃COC₃H₇), is the sum of the atomic weights of each element, which is 86.13 g/mol. One mole of the solution contains 0.350 moles of dichloromethane and 0.650 moles 2-pentanone. Therefore, the mass of 2-pentanone is:

mass = moles x molar mass = 0.650 moles x 86.13 g/mol = 55.9845 g

Solving for the molality, we get:

m = 0.350 moles / (5.9845 g)(1 kg/1000g)

m = 6.25 mol/kg = 6.25 m

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The mass of sodium chloride that is required to create a 0.875 M solution 534 g of water is 27.291 g and 0.467 moles of NaCl is required.

Mass of water = 534 g

Molality of the solution = 0.875 m

Molality is the number of moles of solute per kilogram of solvent.

It is represented by the formula:

Molality = number of moles of solute / kilogram solvent

Its mathematical expression is:

m = n/kg

Now we will convert the g into kg.

Mass of water = 534 g× 1kg/1000 g = 0.534 kg

putting the values in formula:

0.875 m = n / 0.534 kg

n = 0.467 mol

Now we will calculate the mass of sodium chloride:

Mass = number of moles × molar mass

Mass = 0.467 mol × 58.44 g/mol

Mass = 27.291 g

Thus, the required mass and moles of NaCl are 27.291g and 0.467mol respectively.

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The given statement "a mixture of gases can be described as a solution because it is a homogeneous mixture that has a uniform composition throughout at the molecular level" is true because  properties of the mixture are the same throughout, and the composition of the mixture does not vary from one part to another.

A mixture of gases can be described as a solution because it is a homogeneous mixture, meaning that the composition is uniform throughout the mixture. This is true at the molecular level because the gases are thoroughly mixed, and the molecules of each gas are distributed evenly throughout the mixture.

Therefore, the properties of the mixture are the same throughout, and the composition of the mixture does not vary from one part to another.

Thus the given statement  "a mixture of gases can be described as a solution because it is a homogeneous mixture that has a uniform composition throughout at the molecular level" is true.

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Therefore, the mass of silver sulfide formed when 9.48 g of hydrosulfuric acid is reacted with 6.35 g of silver nitrate is 2.238 g.

When 9.48 g of hydrosulfuric acid is reacted with 6.35 g of silver nitrate, the reaction forms solid silver sulfide. The equation for this reaction is:

H₂S + 2 AgNO₃ → Ag₂S + 2 HNO₃.

To calculate the mass of silver sulfide formed, we need to use the mole ratio of the two reactants. We know that the molecular weight of silver nitrate is 169.88 g/mol and the molecular weight of hydrosulfuric acid is 34.08 g/mol.

Using the mole ratio, we can find the moles of each reactant:

9.48 g/34.08 g/mol = 0.2786 moles of H₂S and 6.35 g/169.88 g/mol = 0.0373 moles of AgNO₃.

Since the reaction forms 1 mole of Ag₂S for every 2 moles of AgNO3, we can calculate the moles of Ag₂S formed: (0.0373 moles of AgNO₃ x 1 mole of Ag₂S)/2 moles of AgNO₃ = 0.01865 moles of AgS.

Now, using the molecular weight of silver sulfide (119.97 g/mol), we can calculate the mass of silver sulfide formed: 0.01865 moles of Ag₂S x 119.97 g/mol = 2.238 g of Ag₂S.

Therefore, the mass of silver sulfide formed when 9.48 g of hydrosulfuric acid is reacted with 6.35 g of silver nitrate is 2.238 g.

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The response to a temperature change as a stress in a chemical reaction is different from the response to a change in concentration because temperature affects the rate of the reaction

Temperature: Temperature affects the rate of a reaction by increasing the number of molecules with enough energy to react. As the temperature rises, molecules move faster, collide more often and with more energy, and react more frequently. This increases the rate of a reaction. Concentration: Concentration affects the amount of reactants and products in a chemical reaction, not the rate. When the concentration of reactants increases, there is an increased chance of collisions, and the amount of product produced will increase as well. When the concentration of reactants decreases, the number of collisions decreases, and the amount of product produced decreases.

To summarize, the response to a temperature change as a stress in a chemical reaction is different from the response to a change in concentration because temperature affects the rate of the reaction, while concentration affects the amount of reactants and products.

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Answer: Hydrogen chloride is a diatomic molecule, consisting of a hydrogen atom H and a chlorine atom Cl connected by a polar covalent bond.

To determine how many milliliters (ml) of 0.280 m barium nitrate are required to remove all of the sulfate ions from 25.0 ml of 0.350 m aluminum sulfate, you can use the following equation:

Molarity (M) = moles/volume (V)

First, calculate the number of moles of sulfate ions in the given volume of aluminum sulfate.

M = 0.350 M = moles/25.0 ml

moles = 0.350 M x 25.0 ml = 8.75 moles

Next, calculate the number of moles of barium nitrate that are needed to completely remove the sulfate ions.

M = 0.280 M = moles/V

moles = 8.75 moles/V

V = 8.75 moles/0.280 M = 31.25 ml

Therefore, 31.25 ml of 0.280 m barium nitrate is required to remove all of the sulfate ions from 25.0 ml of 0.350 m aluminum sulfate.

This is because molarity (M) is a measure of concentration that is equal to moles of a substance divided by the volume of the solution (V). Thus, to remove the sulfate ions from the aluminum sulfate solution, you must calculate the molarity of the aluminum sulfate, calculate the number of moles of sulfate ions in the solution, and then calculate the number of moles of barium nitrate that are needed to completely remove the sulfate ions. The volume of barium nitrate required is equal to the number of moles of sulfate ions divided by the molarity of the barium nitrate.  

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In a first-order reaction, time required for completion of 99.9% is 10 times of half-life (t1/2) of the reaction.

In a first-order reaction, the rate of the reaction is inversely correlated with the concentration of the reactant. In other words, if the concentration doubles, so does the pace of the reaction. The half-life of a reaction is defined as the amount of time it takes for half of the reactant to be consumed. The half-life of a first-order reaction is given by:

t1/2 = 0.693/k

where k is the rate constant of the reaction.

The chemical kinetics rate law, which connects the molar concentration of reactants to reaction rate, uses the rate constant as a proportionality factor. The letter k in an equation designates it, which is also referred to as the reaction rate constant or reaction rate coefficient.

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If any combustion reaction generates 4.50 moles of carbon dioxide then the equivalant amount in grams will be 198 g (in 3 significant figures).

The molar mass of carbon dioxide (CO2) is qual to 44.01 g/mol.

In order to find the mass of 4.50 moles of CO2, we can use the following formula,

mass = number of moles × molar mass

Substituting the provided values, we will obtain,

mass = 4.50 mol × 44.01 g/mol

mass = 198.045 g

Therefore, after rounding to three significant figures, the mass of 4.50 moles of CO2 is obtaine to be 198 g.

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If any combustion reaction generates 4.50 moles of carbon dioxide then the equivalant amount in grams will be 198 g (in 3 significant figures).

The molar mass of carbon dioxide (CO2) is qual to 44.01 g/mol.

In order to find the mass of 4.50 moles of CO2, we can use the following formula,

mass = number of moles × molar mass

Substituting the provided values, we will obtain,

mass = 4.50 mol × 44.01 g/mol

mass = 198.045 g

Therefore, after rounding to three significant figures, the mass of 4.50 moles of CO2 is obtaine to be 198 g.

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One tube has a buffered solution + acid and the other tube has water + acid. To decide whether or not the solution is buffered, a simple pH test can be done. An acid-base indicator can be used to determine the pH of each solution.

A buffered solution is defined as a solution that can withstand minor changes in pH upon the addition of small amounts of an acid or base.

Consider the following steps:

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Answer: The defense mechanism in which self-justifying explanations replace the real, unconscious reasons for actions is Rationalization.

Rationalization is a type of defense mechanism where individuals create a logical explanation for their own behavior, even if the behavior is actually driven by emotions or unconscious thoughts.

This type of defense is used to protect the ego from the anxiety of a certain situation, usually one that is perceived to be too uncomfortable or overwhelming.

By rationalizing a behavior, the individual is able to tell themselves that they did the right thing, even if the choice was not made consciously or with the best intentions. Rationalization is a way to protect one’s ego by creating a logical justification for an action.

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Magnetite has a higher iron content than hematite, with a percentage of approximately 70% iron content per kilogram, compared to hematite which has approximately 50% iron content per kilogram.

Therefore, Magnetite provides the greater percent of iron per kilogram.

Hematite (Fe2O3) and Magnetite (Fe3O4) are two important ores of iron.

The greater iron content of Magnetite is due to its higher iron to oxygen ratio compared to hematite.

Specifically, the formula of Magnetite is Fe3O4, with three iron (Fe) atoms and four oxygen (O) atoms, while the formula of Hematite is Fe2O3, with two iron (Fe) atoms and three oxygen (O) atoms.

This difference in the ratio of iron to oxygen gives Magnetite a higher iron content.

The higher iron content of Magnetite makes it more desirable for use in various applications, such as in steel production.

Steel production requires a high amount of iron and therefore Magnetite is the more attractive option. Additionally, the high iron content also makes Magnetite more valuable than Hematite as it can be sold for a higher price.

Magnetite has a higher iron content than Hematite and thus provides the greater percent of iron per kilogram.

This makes Magnetite the preferred choice for various applications, including steel production and sale.

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