which of the follwoing acts to keep a rock solid (instead of melting)?
a. an increases in temp.
b. an increase in the vibration with lattice
c. an increase in confining pressure
d. none of these

Answer:

it's (A) I know bc i toke the test

Explanation: I hope this helps pls add me as a friend and mark me as brainiest

Answer:

A

Explanation:

The molar mass of copper (II) chlorate can be used to calculate how many moles of copper (II) chlorate are present in 1.45x1021. Copper (II) chlorate has a molar mass of 222.07 g/mol.

By dividing the mass of copper (II) chlorate by its molar mass, it is possible to determine how many moles of copper (II) chlorate are contained in 1.45x1021.

Accordingly, there are 6.57x1018 moles of copper (II) chlorate in 1.45x1021, which is the amount of copper (II) chlorate.

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1. The activation energy for the reaction is 80 KJ

2. The letter that represents the activation energy is E

3. The change in energy for the reaction is 20 KJ

4. The reaction is endothermic

5. The activation energy after the reaction was catalyzed is 50 KJ

6. The letter that represents the activation energy after the reaction was catalyzed is B

We can obtain the activation energy for the reaction as follow:

Activation energy = Peak energy - Energy of reactant

Activation energy = 80 - 0

Activation energy = 80 KJ

The letter which represent the activation energy is letter E

The change in energy can be obtain as follow:

Change in energy = Energy of product - energy of reactant

Change in energy = 20 - 0

Change in energy = 20 KJ

The change in energy obtained above is positive (i.e 20 KJ).

Thus, we can conclude that the reaction is endothermic reaction.

We can obtain the activation energy after the catalyst is added as follow:

Activation energy = Peak energy - Energy of reactant

Activation energy = 50 - 0

Activation energy for catalyzed reaction = 50 KJ

The letter which represent the activation energy after the catalyst is added is letter B

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In chemistry, a compound is formed when two or more different elements combine chemically. Compounds are named based on a set of rules called nomenclature, which involves specifying the types and numbers of atoms present in the compound.

When naming a compound, it is important to specify the charge of the compound if it is an ion. An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge. If a compound is an ion, then its charge must be specified in its name. For example, sodium chloride (NaCl) is a neutral compound, but if it loses an electron, it becomes a positively charged ion, known as a cation. The charge on this ion is indicated by writing the symbol of the element, followed by the charge in parentheses, such as Na+. Similarly, if a compound gains an electron, it becomes a negatively charged ion, known as an anion. The charge on this ion is indicated by writing the symbol of the element, followed by the charge in parentheses, such as Cl-. In general, the charge on an ion is indicated by a superscript after the element symbol. In summary, the charge on a compound must be specified in its name if it is an ion. The charge is indicated by a superscript after the element symbol, and this is an important part of the compound's nomenclature.

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1) The activation energy is 80 kJ

2) I represents the activation energy

3) The change in energy is 20 kJ

4) The reaction is endothermic

5) After the catalyst was added the activation energy decreased to 50 kJ

6) The activation energy after the catalyst was added is II

The very minimum of energy needed for a chemical reaction to take place is called activation energy. In order for reactant molecules to transform into products, the energy barrier must be broken.

Chemistry places a lot of emphasis on the idea of activation energy since it affects how quickly a reaction proceeds. The reaction moves more slowly the larger the activation energy.

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Nitrobenzene is a chemical compound with the molecular formula C6H5NO2. It is a pale yellow oily liquid with a sweet almond-like odor.

Nitrobenzene is widely used in the production of aniline, which is used in the manufacture of dyes, pharmaceuticals, and rubber chemicals. It is also used as a solvent for cellulose esters, resins, and oils, as well as a flavoring agent in the food industry. Despite its many uses, nitrobenzene is toxic and can cause harm to humans and the environment. It is classified as a Category 2 carcinogen and can cause damage to the liver, kidney, and central nervous system. Exposure to nitrobenzene can occur through inhalation, ingestion, or contact with the skin. Therefore, it is important to handle nitrobenzene with care and follow proper safety procedures when working with this compound. In summary, nitrobenzene is a widely used chemical compound with many industrial applications. However, due to its toxic nature, precautions must be taken when handling it to ensure the safety of individuals and the environment.

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After the benzoic acid has been formed, it can be further isolated through a variety of methods.

One common method is to perform a recrystallization process, which involves dissolving the crude benzoic acid in a solvent such as hot water and then allowing the solution to cool slowly which allows the benzoic acid to form crystals, which can be filtered and dried to yield a pure product. Other methods of isolation may include extraction with organic solvents or chromatography techniques. Overall, the goal of isolating the benzoic acid is to obtain a highly purified product that can be used for further study or applications. The gas condenses and forms a solid, which is then collected in a separate container.

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The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only transferred or converted from one form to another. The second law of thermodynamics states that the entropy (or disorder) of a closed system will tend to increase over time.

The first law of thermodynamics, sometimes referred to as the law of conservation of energy, holds that energy can only be transferred or changed from one form to another and cannot be created or destroyed.

The entropy (or disorder) of a closed system will often tend to rise with time, according to the second law of thermodynamics.

These rules significantly affect both chemical processes and living things. The first law of thermodynamics states that the system's total energy must not change throughout chemical processes and that any energy changes must be counterbalanced by oppositely polarised energy changes elsewhere in the system.

Contrarily, chemical reactions will tend to move in a manner that increases entropy, or disorder, according to the second law of thermodynamics.

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The reaction consumes 4.032 g of H₂ and 31.998 g of O₂.

When a spark is passed through a mixture of 1.00 g of H₂ and O₂, water is formed. The chemical equation for the reaction is:

2H₂ + O₂ → 2H₂O

According to the stoichiometry of the equation, 2 moles of H₂ react with 1 mole of O₂ to produce 2 moles of H₂O. The molar mass of H₂O is 18.015 g/mol.

1 mole of H₂ has a mass of 2.016 g, so 1.00 g of H₂ is equivalent to 0.496 mol.

1 mole of O₂ has a mass of 31.998 g, so the amount of O₂ present can be calculated as:

0.496 mol H₂ x (1 mol O₂ / 2 mol H₂) = 0.248 mol O₂

So, the total mass of H₂O formed can be calculated as:

2 mol H₂O x 18.015 g/mol = 36.03 g

This means that 36.03 g of water is formed in the reaction. The masses of H₂ and O₂ consumed can be calculated using their respective stoichiometric coefficients:

2 mol H₂ x 2.016 g/mol = 4.032 g H₂

1 mol O₂ x 31.998 g/mol = 31.998 g O₂

As a result, the reaction uses 4.032 g of H₂ and 31.998 g of O₂.

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In terms of Chalk , the  reflection and assumption  is that Chalk is a soft white rock used for writing, drawing, and various industries.

Assumptions: Chalk is seen as safe for schools, yet may have impurities/allergens causing health issues in large amounts. Also believed eco-friendly due to natural sources and biodegradability.

In terms of Vinegar, the  reflection and assumption  is that is an acidic liquid used in cooking, cleaning, and medicine. It's made by fermenting ethanol with acetic acid bacteria.

Vinegar's health benefits are assumed but not fully supported by science. Vinegar is a natural cleaning agent, but may not work as well as commercial products for some stains or germs.

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The monatomic ion with a charge of 1+ and the electron configuration of [Kr]4d105s2 is the ion of silver, Ag+. There is one unpaired electron in the ground state of this ion.

The electron configuration [Kr]4d105s2 corresponds to the neutral atom of silver (Ag). When silver loses one electron to form a 1+ ion, the electron is removed from the 5s orbital, leaving the ion with the electron configuration [Kr]4d105s1. The 4d and 5s orbitals are close in energy, so there is a possibility for one of the unpaired electrons in the 4d orbital to be promoted to the 5s orbital, resulting in a fully filled 4d subshell and one unpaired electron in the 5s orbital. In this case, since only one electron is removed from the neutral atom, there will be one unpaired electron in the ground state of the Ag+ ion.

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The correct options based on the information will be:

Enhanced boiling points can be attributed to heightened intermolecular forces since more energy is demanded to break the bonds between molecules in a liquid state and transform them into a gaseous phase.

The presence of strong intermolecular force characterizes Bromine. Fluorine, on the other hand, serves as a gas when under standard temperature and pressure conditions because it experiences weak intermolecular forces consequent to its nonpolar nature and limited size.

Due to the involvement of polarizable electrons and larger proportions, Bromine remains in its liquid state while kept at standard temperature and pressure, attesting thereby to a stronger intermolecular bond compared with Fluorine's relatively weaker bonding property.

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Ethers can be formed between alcohols by dehydration reactions. In a dehydration reaction, two alcohol molecules react together, resulting in the formation of an ether molecule and the release of a water molecule.

Let us discuss more on dehydration reactions in detail.

1. Two alcohol molecules come in close proximity.
2. A proton (H⁺) from one alcohol molecule is transferred to the oxygen of the other alcohol molecule.
3. The oxygen with the extra proton forms a water molecule (H₂O), leaving behind a carbocation (a carbon with a positive charge).
4. The oxygen from the second alcohol molecule forms a bond with the carbocation, creating an ether molecule.
5. The water molecule is released as a byproduct.

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Therefore, the pH of the solution is 2.668, rounded to three decimal places.

The pH of the solution, we need to find the concentration of H+ ions in the solution, which is determined by the dissociation of HCl and [tex]HClO_2[/tex] in water.

HCl dissociates completely in water to form H+ and Cl- ions:

HCl → H+ + Cl-

So the concentration of H+ ions in the solution due to the HCl is simply equal to the concentration of HCl:

[H+] = 1.10× [tex]10^{-2[/tex]

On the other hand, [tex]HClO_2[/tex] is a weak acid, which only partially dissociates in water according to the equation:

[tex]HClO_2[/tex] +[tex]H_2O == H_3O+ + ClO_2^{-}[/tex]

The dissociation constant (Ka) for this reaction is 1.1×[tex]10^{-2[/tex] .

Using the expression for the Ka of a weak acid, we can write:

[tex]K_a = [H_3O+][ClO_2^{-}][/tex]/[ [tex]HClO_2[/tex]]

Assuming that the dissociation of [tex]HClO_2[/tex] is small compared to its initial concentration, we can approximate [ [tex]HClO_2[/tex]] as its initial concentration, and simplify the expression to:

[tex]K_a = [H_3O+][ClO_2^{-}][/tex] / (1.10× ×[tex]10^{-2[/tex] )

Rearranging and solving for [[tex]H_3O[/tex]], we get:

{[tex]H_3O^{+}[/tex]] = √(Ka x [ [tex]HClO_2[/tex]])

{[tex]H_3O^{+}[/tex]]  = √(1.1 ×[tex]10^{-2[/tex] M x 1.10×[tex]10^{-2[/tex] M)

{[tex]H_3O^{+}[/tex]]  = 1.05×[tex]10^{-3[/tex] M

Now, we can find the total concentration of H+ ions in the solution by adding the concentration due to HCl to the concentration due to the dissociation of  [tex]HClO_2[/tex]:

[H+] = [HCl] + {[tex]H_3O^{+}[/tex]]

[H+] = 1.10×[tex]10^{-3[/tex] M + 1.05×[tex]10^{-3[/tex] M

[H+] = 2.15×[tex]10^{-3[/tex] M

Finally, we can calculate the pH of the solution using the formula:

pH = -log[H+]

pH = -log(2.15×[tex]10^{-3[/tex])

pH = 2.668

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Answer:
A Compound

Explanation:

got it right

0.32mm is the vertical length between 1 mL divisions on the graduated cylinder. The mass of the graduated cylinder is 0.070g.

Inner Diameter = 23 mm

Outer Diameter= 25 mm

Density = 2. 23 [tex]g/cm3[/tex]

Volume =  100 mL

The volume of a cylinder is calculated by:

v = 2 * (π) * r * r * h

Here radius r is the unknown term. To calculate the radius of the cylinder,

r = (Outer Diameter - Inner Diameter) /2

r = (25 mm - 23 mm)/2

r = 1 mm

Calculating the height of the cylinder,

h = 100 mL / π*r*r

h  = 100 mL / π*1

h = 100 / π mm

height  = 31.8 mm x 100 = 0.32mm

To calculate the mass of the cylinder

m = ρV

V = π * r* r* h

V = π*(1 mm)*(100 mm) / 1000

V= 0.0314 [tex]cm^3[/tex]

m = ρV = 2.23 [tex]g/cm^3[/tex] × 0.0314 [tex]cm^3[/tex]

m = 0.070 g

Therefore, we can conclude that the mass of the graduated cylinder is 0.070g.

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The Gibbs energy change is a better parameter which is used to determine the spontaneity or feasibility of a process. If the value of Gibbs free energy change is negative, then the process is spontaneous.

The maximum amount of energy available to the system that can be converted into useful work during a process is called the Gibbs energy. It is denoted by G.

The equation connecting equilibrium constant and G is:

ΔG° = -RT lnK

-8.314 × 298 × ln 4.6 × 10⁻² = 7.62 kJ

E°cell = 0.0592/n log K

0.0592 / 2 log 4.6 × 10⁻² = -0.022 V

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The temperature in Celsius of 308 K is 35°C. Option A is correct.

Temperature in Celsius (°C) is a unit of measurement used to express the amount of thermal energy or heat present in a substance or environment, relative to the freezing and boiling points of water.

In the Celsius scale, the freezing point of water is defined as 0°C, and the boiling point of water is defined as 100°C, at standard atmospheric pressure.

To convert temperature from Kelvin (K) to Celsius (°C), you subtract 273.15 from the given temperature in Kelvin.

308 K - 273.15 = 34.85°C (rounded to two decimal places)

Since the temperature 308 K is slightly less than 35°C.

Hence, A. is the correct option.

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Toxic gases and radioactive gases are the two categories of materials that require special engineering for chemical hoods.

The design and construction of the hoods must take into consideration the potential hazards of these materials to ensure the safety of workers and prevent any release of harmful substances into the surrounding environment. Chemical hoods are a critical component of laboratory safety and must be carefully designed and maintained to protect workers and the surrounding area from exposure to hazardous materials. Special engineering is needed to ensure that the hood is properly vented and that any radiation that is emitted is contained and not released into the environment.

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The given statement " In living systems, ionic compounds generally exist as ionic crystals" is true because ionic compounds can exist as dissolved ions in solution, such as in the case of electrolytes in the body.

Ionic chemicals commonly exist in living systems as solid ionic crystals rather than as individual molecules.

For instance, rather than existing as separate, discrete molecules, the sodium and chloride ions in table salt (NaCl) create a crystal lattice structure.

The presence of ionic connections in numerous biological components, including DNA and proteins, helps to stabilise their structures.

Ionic compounds, however, can occasionally exist as dissolved ions in solutions, as is the case with the body's electrolytes.

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The resulting pressure at 0°C is approximately 499.3 mm Hg.

To solve this problem, we can use the combined gas law equation, which relates the pressure, volume, and temperature of a gas:

(P1 × V1) / T1 = (P2 × V2) / T2

Where:

P1 = Initial pressure

V1 = Initial volume (assumed constant in this case)

T1 = Initial temperature

P2 = Final pressure (what we're trying to find)

V2 = Same volume as V1 (assumed constant in this case)

T2 = Final temperature

We can plug in the given values:

P1 = 545.0 mm Hg

V1 = constant

T1 = 24.0°C + 273.15 = 297.15 K (converted to Kelvin)

P2 = unknown

V2 = constant

T2 = 0°C + 273.15 = 273.15 K (converted to Kelvin)

Now we can solve for P2:

(P1 × V1) / T1 = (P2 × V2) / T2

P2 = (P1 × V1 × T2) / (V2 × T1)

Since V1 and V2 are constant (the volume is assumed to stay the same), we can simplify the equation:

P2 = (P1 × T2) / T1

Plugging in the values:

P2 = (545.0 mm Hg × 273.15 K) / 297.15 K

P2 = 499.3 mm Hg (rounded to 3 significant figures)

Therefore, the resulting pressure at 0°C is approximately 499.3 mm Hg.

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The order in which the anions will be precipitated when soluble Pb2+ is added to a solution will depend on their respective solubility product constants (Ksp).

An anion with a lower Ksp value will precipitate first, followed by the anion with the next lowest Ksp value and so on. Therefore, without knowing the specific anions present in the solution and their respective Ksp values, it is impossible to determine the exact order in which they will be precipitated.

Solubility is a term used in chemistry to describe a material's capacity to mix with another substance, the solvent. The opposing property is called insolubility, or the solute's inability to produce such a solution.

The term "solubility" is used to describe the greatest quantity of a chemical that may dissolve in a given amount of solvent at a particular temperature, using the chemical AgCl (silver chloride) as an example. Due to its limited solubility in water, silver chloride only partially dissolves to form a saturated solution. On the other hand, molar solubility is the quantity of AgCl that may dissolve in a litre of solvent to form a saturated solution.

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Answer:

The balanced chemical equation for the reaction of Na with H₂O is:

2Na + 2H₂O → 2NaOH + H₂

According to the given data, 4.00 x 10^2 mL of H₂ gas is produced at STP. We can use the ideal gas law to determine the number of moles of H₂ gas produced: PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

At STP, P = 1 atm and T = 273 K, so:

V = nRT/P = (1 mol)(0.0821 L atm/mol K)(273 K)/(1 atm) = 22.4 L

Therefore, 4.00 x 10^2 mL of H₂ gas is equal to 0.4 L.

We can use the stoichiometry of the balanced chemical equation to relate the moles of H₂ gas produced to the moles of Na required:

2 mol Na : 1 mol H₂

x mol Na : 0.5 mol H₂

x = 0.25 mol Na

The molar mass of Na is 22.99 g/mol, so:

0.25 mol Na x 22.99 g/mol = 5.75 g Na

Therefore, 5.75 grams of Na are needed to liberate 4.00 x 10^2 mL of H₂ gas at STP

The Ksp value for MgSO₃ is 5.5×10−21. The concentration of Mg²⁺ in solution is 8.9×10−11 M. To generate a precipitate, the concentration of SO₂⁻³ must exceed 6.2×10−11 M.

Ksp refers to the solubility product constant  that provides equilibrium constant for the dissolution of a particular solid substance into an aqueous solution. It projects the level at which a solute dissolves in solution. The greater the Ksp value of a substance.
It places  a mathematical relationship that states how the concentrations of the products differentiate with the concentration of the reactants. Furthermore, subscripts are placed to the equilibrium constant symbol K, such as K eq, K c, K p, K a, K b, and K sp.

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The density of the glucose solution is 0.951 g/mL.

To find the density of the glucose solution, we need to first calculate the mass of the solution.

We know that the sample of the solution had a mass of 10.483 g, and we can assume that the density of the solution is close to that of water (1 g/mL).  Therefore, the volume of the sample is:

Volume = Mass / Density = 10.483 g / 1 g/mL = 10.483 mL

Now, we can use the formula for density:

Density = Mass / Volume

The mass of the solution can be found by subtracting the mass of the glucose residue from the initial mass of the sample:

Mass of solution = 10.483 g - 0.524 g = 9.959 g

Substituting these values, we get:

Density = 9.959 g / 10.483 mL = 0.951 g/mL

Therefore, the density of the glucose solution is 0.951 g/mL.

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NOTE- The question seems to be incomplete, The complete question isn't available on the search engine.

Molarity is the number of moles of solute per liter of solution, while ppm is the mass of solute per million parts of the solution.

Fixation is a proportion of how much solute disintegrated in a dissolvable. Two familiar approaches to communicating focus are molarity and parts per million (ppm).

Molarity is characterized as the quantity of moles of solute broke up in one liter of arrangement. It is addressed by the image M and is determined as follows:

M = moles of solute/volume of arrangement (in liters)

For instance, on the off chance that 0.5 moles of NaCl is disintegrated in 1.0 L of water, the molarity of the arrangement would be:

M = 0.5 mol/1.0 L = 0.5 M

Parts per million (ppm) is a unit of fixation that communicates the proportion of the mass of solute to the mass of the arrangement, duplicated by 1,000,000. It is addressed by the image ppm and is determined as follows:

ppm = (mass of solute/mass of arrangement) x [tex]10^6[/tex]

For instance, on the off chance that 0.1 g of lead is disintegrated in 1.0 L of water, the ppm of lead in the arrangement would be:

ppm = (0.1 g/1000 g) x [tex]10^6[/tex] = 100 ppm

Molarity and ppm are both valuable approaches to communicating focus and are utilized in different fields, including science, science, and natural science. It is vital to comprehend how to ascertain and switch between these units of focus over completely to precisely plan and examine arrangements in the research facility.

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The complete question is:

SOLUTION CONCENTRATION WORKSHEET 1) If you dissolve 8.56 grams of sodium chloride in 25.09 grams of water, calculate the percent (m/m), of sodium chloride. [25.4%) 2) Calculate the molarity of a solution that contains 18.9 grams of sodium hydroxide in 3.67 L of solution. [O. 13mol/L) 3) How many moles of potassium hydroxide are in 4.82 mL of a 0.050 M solution of potassium hydroxide? [0.000241 mol) 4) If 35 g of copper (II) chloride is placed in 140 mL of water, what will be the percent (m/v) of the solution? (25%) 5) The (m/m)% of silver in sterling silver alloys is 92.5%. What mass of pure silver is found in a ring that has a mass of 6.45 g? [5.97g] 6) Health Canada's guideline for the maximum mercury content in commercial fish is 0.5 ppm. When a 1.6 kg salmon was tested, it was found to contain 0.6 mg of mercury. Would this salmon be safe to eat? [0.4ppm;salmon is safe to eat] 7) A saline solution contains 0.90 g of sodium chloride, dissolved in 100 mL of solution. What is the molar concentration of the solution? [0.15 mol/L) 8) Calculate the mass of solute needed to make 250 mL of a 0.50 M solution of NH,CI [6.79] 8) Calculate the mass of solute needed to make 250 mL of a 0.50 M solution of NH,CI [6.79] 9) A solution is made by mixing 50.0mL of ethanol with 50.0mL of water. Determine the percent by mass (m/m) of ethanol in this solution. The densities of ethanol and water are 0.789g/mL and 1.00g/mL respectively [44.1% m/m ethanol] 10) Calculate the molarity of a solution containing 0.750mol of HCI in 335mL of solution. [2.24 mol HCI/L) 11) Calculate the molarity of a solution that contains 13.5g of sodium sulphate in 850mL of solution. [O .112M Na So.] 12) A laboratory experiment calls for 0.300M KOH solution. Calculate the number of moles of KOH that would be in 150mL of the solution [0.0450 mol KOH] 13) Calculate the number of grams of solute in 150mL of 0.30M NaOH. [1.8gNaOH) 14) How many liters of 0.10M aluminum chloride will contain 0.45 mol of chloride ion? [1.5L] 15) If you had a 1.25M solution of hydrochloric acid, how much of it would you have to use to make 1.5L of a 0.25M solution? [300mL].

If we say 2p6, the 2 corresponds to the energy level, and the 6 corresponds to the number of electrons in those orbitals.

In the electron configuration notation, the term "2p6" describes the arrangement of electrons in an atom's valence shell. The "2" in this term refers to the principal quantum number, which indicates the energy level of the valence shell. The "p" refers to the type of orbital, specifically the "p" orbital. The "6" indicates the total number of electrons present in that set of "p" orbitals. Therefore, the term "2p6" tells us that the valence shell of the atom has two energy levels and contains six electrons in the "p" orbitals. Overall, electron configuration notation helps us understand the electronic structure of atoms and their chemical properties.

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