a dissolution process is exothermic if the amount of energy released in bringing about ? interactions is greater than the sum of the amounts of energy absorbed in overcoming ? and ? interactions. 1. solvent-solute; solute-solute; solventsolvent 2. solute-solute; crystal lattice; solventsolvent 3. solute-solute; solvent-solvent; solventsolute 4. solvent-solvent; solute-solute; solventsolute 5. solvent-solute; solute-solute; crystal lattice

Presently, the annual average concentration of CO2 is about 400 ppm, and the concentration is increasing by about 2-3 ppm per year.

The concentration of CO2 in the atmosphere has been increasing steadily due to human activities, such as burning fossil fuels, deforestation, and industrial processes. The rate of increase in CO2 concentration varies from year to year, but on average, it is increasing by about 2-3 ppm per year. This rate of increase has been accelerating over the past few decades due to increased emissions from human activities.

This increase in CO2 concentration is a major contributor to global climate change, as CO2 is a greenhouse gas that traps heat in the Earth's atmosphere and contributes to global warming. Reducing greenhouse gas emissions and finding ways to remove CO2 from the atmosphere are critical steps in addressing the challenge of global climate change.

Learn more about global warming here:

https://brainly.com/question/12908180

#SPJ11

The acid dissociation constant (Ka) for uric acid is [tex]1.0 x 10^-5.[/tex]

The dissociation of uric acid can be represented as follows:

H2UA ⇌ H+ + HUA

The equilibrium expression is given by:

Ka = [H+][HUA-]/[H2UA]

where Ka is the acid dissociation constant, [H+] is the concentration of hydrogen ions, [HUA-] is the concentration of the urate ion, and [H2UA] is the concentration of uric acid.

At equilibrium, the concentration of H2UA is equal to the initial concentration minus the concentration of H+ ions that have been consumed:

[H2UA] = 0.110 - [H+]

The concentration of HUA- can be calculated from the equation:

[HUA-] = [H+]

Substituting the above expressions into the equilibrium expression for Ka, we get

[tex]Ka = ([H+]^2) / (0.110 - [H+])[/tex]

Substituting [H+] = 3.4 x 10^-2 M, we get:

[tex]Ka = [(3.4 x 10^-2)^2] / (0.110 - 3.4 x 10^-2)[/tex]

[tex]Ka = 1.0 x 10^-5[/tex]

Therefore, the acid dissociation constant (Ka) for uric acid is [tex]1.0 x 10^-5.[/tex]

Learn more about dissociation constant

https://brainly.com/question/28197409

#SPJ4

The volume of the sample of wood is 110.9 mL.

Volume is the measure of the amount of space which is occupied by an object or the substance. It is usually expressed in units such as liters, milliliters, cubic meters, or cubic centimeters. The volume of a solid can be calculated by measuring its dimensions and using mathematical formulas, while the volume of a liquid can be measured directly using a graduated cylinder or a pipette.

To find the volume of the sample of wood, we can apply the following formula;

Density = Mass/Volume

Rearranging the formula, we get;

Volume = Mass/Density

Substituting the given values, we get:

Volume = 95.1 g / 0.857 g/mL

Volume = 110.9 mL

To know more about volume here

https://brainly.com/question/1578538

#SPJ4

Ozone  is the primary absorber of UV radiation in the 150-200 nm range in the upper atmosphere, and its depletion can have significant consequences for life on Earth.

UV radiation with wavelengths between 150-200 nm is highly energetic and can cause damage to living cells by breaking chemical bonds and damaging DNA. Therefore, it is important to prevent most of this radiation from reaching the Earth's surface where it can harm living organisms.

In the upper atmosphere, ozone (O3) plays a crucial role in absorbing this harmful UV radiation through the process of photodissociation. When a molecule of ozone absorbs a photon of UV radiation, it undergoes photodissociation or photolysis, which results in the dissociation of the ozone molecule into an oxygen molecule (O2) and an oxygen atom (O):

O3 + hv -> O2 + O

This process is highly efficient and can absorb more than 97% of the incoming UV radiation in the 150-200 nm range. The oxygen atoms produced in this process can then react with other oxygen molecules to form more ozone, thereby replenishing the ozone layer and continuing this protective cycle.

While other molecules such as nitrogen (N2) and oxygen (O2) can also absorb UV radiation in this range, they are much less efficient at doing so compared to ozone. Therefore, ozone is the primary absorber of UV radiation in the 150-200 nm range in the upper atmosphere, and its depletion can have significant consequences for life on Earth.

Visit to know more about Ozone:-

brainly.com/question/5019112

#SPJ11

We can conclude that the value of A must be less than the value of B. Based on the graph, the value of B is around 0°C. So, we can estimate that the value of A is likely to be around -10°C to 0°C.

What is Temperature?

Temperature is a physical quantity that measures the degree of hotness or coldness of an object or substance. It is a measure of the average kinetic energy of the particles that make up a system.

In simpler terms, temperature is a measure of how fast the atoms and molecules in a substance are moving. When the particles are moving faster, the temperature is higher, and when they are moving slower, the temperature is lower.

Based on the given information, we know that at time 0 minutes, the temperature is labeled as A. Therefore, to find the temperature value of A, we need to look at the y-axis at time 0 minutes.

Since the temperature scale is not given, we cannot determine the numerical value of A directly. However, we can make some observations about the graph to infer the approximate value of A.

Learn more about Temperature from the given link

https://brainly.com/question/26866637

#SPJ1

The most dangerous airborne particulates are known as PM2.5 (particulate matter 2.5 micrometers or smaller in diameter).

These fine particles can be inhaled deep into the lungs, potentially causing severe health problems, such as respiratory and cardiovascular issues. Due to their small size and ability to bypass our body's natural defenses, PM2.5 particulates pose a significant risk to human health.

The following are a few of the riskiest airborne particulates:

Fine particulate matter (PM2.5) is a term used to describe microscopic particles having a diameter of 2.5 micrometres or less that have the ability to enter the bloodstream and go deep into the lungs. Asthma, heart attacks, and lung cancer are just a few of the respiratory and cardiovascular issues that PM2.5 can bring on.

Paints, cleaning supplies, and building materials all include volatile organic compounds (VOCs), which are organic substances that can vaporise into the air at room temperature. VOCs can irritate the eyes, nose, and throat, induce headaches, and occasionally even lead to cancer.

The incomplete combustion of fossil fuels results in the deadly gas carbon monoxide (CO), which is present in gas heaters, stoves and vehicle exhaust. CO can lead to headaches, lightheadedness,

Learn more about airborne here:

https://brainly.com/question/20332086

#SPJ11

The most dangerous airborne particulates are those that are small enough to reach the deepest parts of the lungs, such as the alveoli, where they can cause damage and inflammation. These particulates are referred to as fine particulate matter (PM2.5) and ultrafine particulate matter (PM0.1).

PM2.5 consists of particles with a diameter of 2.5 micrometers or less, while PM0.1 consists of particles with a diameter of 0.1 micrometers or less. These particulates can come from a variety of sources such as vehicle exhaust, industrial emissions, and wildfires.

Exposure to PM2.5 and PM0.1 has been linked to a range of health effects, including respiratory and cardiovascular disease, as well as premature death. These particulates can also carry toxic chemicals and heavy metals that can further increase their harmful effects on human health.

For more question on airborne particulates click on

https://brainly.com/question/30929564

#SPJ11

The velocity of the 10 M¤ star will be 1/2 times the velocity of the 5 M¤ star of binary star system.

In a binary star system, the velocity of each star depends on their masses and distances from each other. According to Kepler's laws, the more massive star will have a smaller orbit radius and a faster orbital velocity. Therefore, in this binary star system with stars of 10 m¤ and 5 m¤, the velocity of the 10 m¤ star will be higher than that of the 5 m¤ star. The exact ratio of their velocities cannot be determined without additional information about their distances and orbits.
In a binary star system, the stars orbit around a common center of mass. According to Kepler's laws of planetary motion, the velocities of the two stars are inversely proportional to their masses.

Let v1 be the velocity of the 10 M¤ star and v2 be the velocity of the 5 M¤ star. Using the inverse proportionality of velocities and masses, we can write the following equation:

v1 / v2 = M2 / M1

where M1 is the mass of the 10 M¤ star and M2 is the mass of the 5 M¤ star. Now, we can plug in the given values:

v1 / v2 = (5 M¤) / (10 M¤)

Simplify the equation:

v1 / v2 = 1 / 2

So, the velocity of the 10 M¤ star will be 1/2 times the velocity of the 5 M¤ star.

Learn more about binary star system here:

https://brainly.com/question/29912300

#SPJ11

The velocity of the 10 m¤ star will be approximately 0.71 times the velocity of the 5 m¤ star in this binary star system.

v = √(GM/r)

[tex]v_10m / v_5m[/tex]= √(G(5m¤) / r) / √(G(10m¤) / r)

Simplifying the equation, we get:

[tex]v_10m / v_5m[/tex] = √(5/10) = √0.5 ≈ 0.71

The star system is a way to represent the electronic configuration of an atom. It is also known as the "Hund's rule star notation" or "star diagram." The star system is used to show the distribution of electrons in different orbitals of an atom. In this notation, each orbital is represented by a circle, and each circle is divided into sections (or lobes) representing the different possible values of the angular momentum quantum number (l).

The sections are labeled using the corresponding values of l, such as s, p, d, f, and so on. Electrons are represented by arrows, with the direction of the arrow indicating the spin of the electron. The arrows are placed in the sections of the orbital circles according to Hund's rule, which states that electrons will fill the orbitals with the same energy level singly and with the same spin before pairing up.

To learn more about Star system visit here:

brainly.com/question/17046229

#SPJ4

The sample of pure carbon would contain approximately 2.135 x 10²⁴ carbon atoms.

The majority of carbon atoms—98.93%—have masses of 12 atomic mass units. A mass of 13.00 atomic mass units is present in 1.07% of the carbon atoms. 14.) Identify one distinction between the nuclei of carbon-12 and carbon-13 atoms in terms of the subatomic particles that can be discovered there.

First, using the atomic mass of carbon, we must determine how many moles of carbon are present in the sample:

1 mole of carbon atoms = 12.01 g of carbon atoms (atomic mass of carbon)

42.552 g of carbon atoms / 12.01 g/mol = 3.545 moles of carbon atoms

Using Avogadro's number, we can then determine how many carbon atoms are present in the sample:

Number of carbon atoms = 3.545 moles of carbon atoms x 6.022 x 10²³ atoms/mole

Number of carbon atoms = 2.135 x 10²⁴ atoms

To know more about carbon atoms visit:-

https://brainly.com/question/30507533

#SPJ1

At 300 K, some of the donors will ionize, releasing electrons into the conduction band. The concentration of extrinsic conduction electrons can be calculated using the equation [tex]n = N_D * exp(-E_D/kT),[/tex] where n is the concentration of electrons, [tex]N_D[/tex] is the donor concentration, [tex]E_D[/tex] is the binding energy of the donors, k is Boltzmann's constant, and T is the temperature in Kelvin.

(b) At 300 K, some electrons will also be thermally excited into the conduction band, creating intrinsic conduction. The concentration of intrinsic conduction electrons can be calculated using the equation [tex]n_i = N_C * exp(-E_G/2kT)[/tex] , where [tex]n_i[/tex] is the concentration of electrons, [tex]N_C[/tex] is the effective density of states in the conduction band, and [tex]E_G[/tex] is the bandgap energy.

(c) The contribution of intrinsic conduction is generally smaller than that of extrinsic conduction, as the concentration of dopants is usually much higher than the intrinsic carrier concentration at room temperature.

Learn more about electrons ,

https://brainly.com/question/1255220

#SPJ4

The alkene addition reaction that occurs specifically in an anti addition is bromination  in CH₂Cl₂ (dichloromethane solvent).Bromine is a liquid that is more easily handled than chlorine gas, many halogen additions are carried out with bromine. Inert solvent such as methylene chloride (CH₂Cl₂)  is typically used for halogen additions because these solvents dissolve both halogens and alkenes.

Attack of the alkene on bromine  gives the bromonium ion, which is attacked at the backside by bromide ion to give the trans-dibromo product. Note that the bromines are delivered to opposite sides of the alkene (“anti” addition). The bromines add to opposite faces of the double bond (“anti addition”). Sometimes the solvent is mentioned in this reaction – a common solvent is CH₂Cl₂ (dichloromethane solvent). CH₂Cl₂ actually has no effect on the reaction, it’s just to distinguish this from the reaction where the solvent is H₂O, in which case a bromohydrin is formed.

Learn more about bromination here:

https://brainly.com/question/28938775

#SPJ11

The total number of joules of heat energy needed to raise the temperature of 10 grams of water from 20°C to 30°C is 418.4 J. The specific heat capacity of water is 4.184 J/g·°C.

To find the total heat energy needed, we can use the formula:

Q = m·c·ΔT

where:

Q = heat energy (in Joules)

m = mass of the water (in grams)

c = specific heat capacity of water (4.184 J/g·°C)

ΔT = change in temperature (in °C)

Substituting the values given, we get:

Q = 10 g × 4.184 J/g·°C × (30°C - 20°C)

Q = 418.4 J

Therefore, the total number of joules of heat energy needed to raise the temperature of 10 grams of water from 20°C to 30°C is 418.4 J.

Learn more about heat energy

https://brainly.com/question/29210982

#SPJ4

A specific safety concern when handling the TLC developing solvent used in this experiment is to keep it away from open flames or hot surfaces. Option 2 is correct.

The TLC developing solvent used in this experiment is often a flammable organic solvent such as ethyl acetate or hexane. These solvents have a low flash point, which means they can ignite easily and burn rapidly if exposed to an ignition source such as an open flame or hot surface.

Therefore, it is important to keep the solvent away from open flames or hot surfaces to prevent fires and explosions. In addition, it is recommended to handle these solvents in a well-ventilated area to minimize the risk of inhalation or skin exposure. It is also important to avoid contact with reactive metals, as some solvents can react with metals to form hydrogen gas, which can be flammable or explosive.

Finally, these solvents should not be mixed with water, as they are immiscible and can form separate layers, which can cause splattering or other hazards. Hence Option 2 is correct.

To learn more about TLC developing solvent, here

https://brainly.com/question/17562109

#SPJ4

Answer:

mass of NH₃ formed when 22g of H₂ react completely = 124.67 grams

Explanation:

3H₂ + N₂ → 2NH₃

The ratio of coefficients of reactants and products in the above reaction equation (3 : 1 : 2), is known as the stoichiometry of the reaction.

A stoichiometric amount of a reagent is the the optimum amount or ratio where, assuming that the reaction proceeds to completion, all of the reagent is consumed, there is no deficiency of the reagent, and there is no excess of the reagent. Thus if the stoichiometry of a reaction is known, as well as the mass of one of the substances, then it is possible to calculate the mass of any of the other substances.

The mole is a unit of amount of substance established by the International System of Units, to make expressing amounts of reactant or product in a reaction more convenient. As defined by Avogadro's Constant, a mole is 6.022×10²³ amounts of something. The mole is used in stoichiometric calculations, instead of the mass.

To convert from mass to moles, we need to divide the mass present in grams, by the molar mass of the substance (the sum of the molar masses of the individual elements comprising the compound), in g/mol, to get the moles. This can be represented by the formula: n = m/M, where n = number of moles, m = mass, M = molar mass.

So if we have 22 g of H₂ gas, which reacts completely, and therefore is a stoichiometric amount, then converting this to moles:

n(H₂) = m/M = 22/2 = 11 mol.

Using our stoichiometry, we can see that the ratio of H₂ to NH₃ = 3 : 2.

Therefore, for every 3 moles of H₂ used, we produce 2 moles of NH₃.

n(NH₃) = 2/3 × n(H₂) = 2/3 × 11 = 7.333 mol.

Finally, converting moles back to mass we get:

m(NH₃) = n×M = 7.333×17 = 124.67 grams

∴ mass of NH₃ formed when 22g of H₂ react completely = 124.67 grams

You should add 370.75g of ce2(so4)3 to 475ml of water to make a saturated solution at 30°C. Since the density of water is 1g/ml, the final volume of the solution will be approximately 845ml.

To make a saturated solution of ce2(so4)3 at 30°C, you would need to dissolve as much of the solute as possible in 475ml of water. The solubility of ce2(so4)3 at 30°C is approximately 77g/100ml of water. Therefore, to calculate how much solute you should add to 475ml of water, you need to use the following equation:

Solute mass = solute solubility x volume of solvent
Solute mass = (77g/100ml) x 475ml
Solute mass = 370.75g

Learn more about saturated solution here: brainly.com/question/1851822

#SPJ11

The average repeat unit molecular weight for average molecular weight of 229,500 g/mol and a number degree of polymerization of 4,000 is equals to the 57.4 g/mol. So, option(c) is right one.

Polymers are large molecules made up of repeating structural units linked together. The degree of polymerization (DP) is the number of repeating units in the polymer molecule. The average molecular weight is the degree of polymerization (MP) multiplied by the molecular weight of the repeat unit (m) is written as [tex] \bar M_n = (DP)(m)[/tex]

We have a random copolymer produced by polymerization of vinyl chloride and propylene.

Average molecular weight= 229500 g/mol

Number degree of polymerization = 4000

Using the above formula, the average repeat unit molecular weight = 229500 g/mol/ 4000

= 57.37 ~ 57.4 g/mol

Hence, required value is 57.4 g/mol.

For more information about degree of polymerization, visit :

https://brainly.com/question/30751495

#SPJ4

The correct statement is: the most probable molecular speed decreases as the molar mass of the gas increases. The relationship observed between the most probable molecular speed and the molar mass of the gas is that the most probable molecular speed decreases as the molar mass of the gas increases. This is because heavier molecules have more inertia and therefore move more slowly than lighter molecules. So, the larger the molar mass, the slower the molecular speed.

This relationship can be explained by the equation for the most probable molecular speed (V_p), which is derived from the Maxwell-Boltzmann distribution:

V_p = √(2 * R * T / M)

where:
- V_p is the most probable molecular speed
- R is the ideal gas constant
- T is the temperature in Kelvin
- M is the molar mass of the gas

As you can see from the equation, the most probable molecular speed (V_p) is inversely proportional to the square root of the molar mass (M). This means that when the molar mass increases, the most probable molecular speed decreases, and vice versa.

Learn more about molar mass at https://brainly.com/question/837939

#SPJ11

The relationship observed between the most probable molecular speed and the molar mass of the gas is the most probable molecular speed decreases as the molar mass of the gas increases.

This relationship can be explained by the following steps:
1. Molecular speed refers to the velocity of individual molecules in a gas sample.
2. Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol).
3. The most probable molecular speed can be estimated using the Maxwell-Boltzmann distribution, which describes the distribution of molecular speeds in a gas.
4. According to this distribution, lighter molecules (with lower molar mass) tend to have higher molecular speeds than heavier molecules (with higher molar mass) at the same temperature.
5. Therefore, as the molar mass of a gas increases, the most probable molecular speed decreases.

To learn more about molecular speed, refer:-

https://brainly.com/question/19243977

#SPJ11

The given statement "A fractional distillation that involves the use of the fractionating column and to provide the multiple condensation or the evaporation cycles over the given distance" is true as it involves the separation of the miscible liquids.

The Fractional distillation is the type of the distillation that will involves the separation of the miscible liquids. This process will involves the repeated distillations and the condensations. The mixture is separated into the component parts. The separation that happens when the mixture will be heated at the certain temperature and the fractions of the mixture will start to vaporize.

The more will be the volatile components will  increase in the vapor state after the heating, and when it  is liquefied, the  volatile components increase in the liquid state.

To learn more about Fractional distillation here

https://brainly.com/question/27004370

#SPJ4

The Elements in groups 11 through 14 lose electrons to form an outer energy level containing full s, p, and d sublevels. These relatively stable electron arrangements are referred to as "noble gas configurations" or "pseudo-noble gas configurations."

The elements in the groups 11 through 14, which include copper, silver, gold, and lead, lose electrons to form an outer energy level containing full s, p, and d sublevels. These stable electron arrangements are commonly referred to as the noble gas configurations, as they resemble the electron configuration of the noble gases located in the group 18 of the periodic table.

Learn more about stable electron here: brainly.com/question/2845051

#SPJ11

The pH of the solution after 3.2 mL of NaOH have been added to the HNO3 is 12.33.

To solve this problem, we need to use the equation:

M(acid)V(acid) = M(base)V(base)

Where M is the molarity of the solution and V is the volume in milliliters.

First, we need to calculate the moles of HNO3 in the initial solution:

0.25 M x 20.0 mL = 0.005 moles HNO3

Next, we need to determine how many moles of NaOH were added to the solution:

0.15 M x 3.2 mL = 0.00048 moles NaOH

Since NaOH is a strong base, it will completely react with the HNO3, forming water and a salt. This means that the number of moles of HNO3 is reduced by the number of moles of NaOH:

0.005 moles HNO3 - 0.00048 moles NaOH = 0.00452 moles HNO3 remaining

Now, we can use the equation for the dissociation of HNO3 in water:

HNO3 + H2O → H3O+ + NO3-

The concentration of H3O+ can be found using the equation for the ion product of water:

Kw = [H3O+][OH-]

Kw is a constant equal to 1.0 x 10^-14 at 25°C. At this point, we have added enough NaOH to completely react with the HNO3, which means that all of the H3O+ initially present in the solution has been neutralized.

Therefore, [OH-] = (moles of NaOH added) / (total volume of solution)

[OH-] = 0.00048 moles / (20.0 mL + 3.2 mL) = 0.0214 M

Using Kw, we can calculate [H3O+]:

1.0 x 10^-14 = [H3O+][OH-]

[H3O+] = 4.67 x 10^-13 M

Finally, we can convert this concentration to pH:

pH = -log[H3O+] = -log(4.67 x 10^-13) = 12.33

To learn more about : NaOH

https://brainly.com/question/28504849

#SPJ11

(a) If one of the reaction products was the then unknown neutron, what was the other product is the C -12.

(b) The q-value of this reaction is the 5.9 × 10⁸ J.

The James Chadwick was discovered the neutron during the experiment involving the nuclear reaction in that the beryllium, bombarded with the alpha particles. The equation of the reaction is as :

⁴Be₉  +  ²He₄  ---->  ⁶C₁₂  +  ⁰n₁

(a) If one of the reaction products was the then unknown neutron, what was the other product is the C -12.

(b) The q-value of this reaction is as :

q = mc²

Where,

The m is the mass

The c is the speed of the light.

m = 4.002603 + 2.014102

m = 1.988501

q = 1.988501  × 3 × 10⁸

q = 5.9 × 10⁸ J

To learn more about James Chadwick here

https://brainly.com/question/14559793

#SPJ4

The given statement, if something is oxidized, it is formally losing electrons. if something is oxidized, it is formally losing electrons is true.

When something is oxidized, it means that it is undergoing a chemical reaction where it loses electrons. This process can be represented using oxidation numbers, which are used to keep track of the transfer of electrons between atoms during a reaction. In general, oxidation is defined as the process by which an atom, ion or molecule loses one or more electrons. This leads to an increase in the oxidation state of the atom, ion or molecule.

There are various examples of oxidation reactions that occur in everyday life. For instance, when iron rusts, it is undergoing an oxidation reaction where it loses electrons to oxygen in the air. Similarly, when a potato is cut and exposed to air, it turns brown due to an oxidation reaction between the oxygen in the air and the enzymes in the potato. In both cases, the process of oxidation involves the loss of electrons from one substance to another.

know more about oxidation numbers here

https://brainly.com/question/29257381#

#SPJ11

Answer:

Answer (Detailed Solution Below)

Explanation:

Option 3 : Substance in solid phase has the least entropy.

The maximum mass of sodium bromide that can be produced in this reaction is 4.05 g. So, the correct answer is option C.

This is because the limiting reagent, or the reagent with the least amount, is the hydrobromic acid, which has a mass of 4.05 g.

HBr + NaOH →  NaBr + H2O is the reaction equation for this reaction. The total mass of the products and reactants must be equal in order for the rule of conservation of mass to apply.

Since hydrobromic acid has a mass of 4.05 g, the maximum mass of sodium bromide that can be produced is the same.

This quantity of sodium bromide is created when both reactants are used up entirely in the reaction and none are left behind.

Complete Question:

A aqueous hydrobromic  acid (HBr) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water (H2O). If 4.05 g of hydrobromic acid is mixed with 3.7 g of sodium hydroxide, what is the maximum mass of sodium bromide that could be produced by the chemical reaction?

A. 2.75 g

B. 3.7 g

C. 4.05 g

D. 4.75 g

To learn more about sodium visit:

https://brainly.com/question/28580895

#SPJ4

This experiment aims to observe the temperature changes during the phase changes of water and formulate hypotheses based on the observations.

The purpose of suspending the thermometer in the ice is to measure the temperature of the ice. It should not touch the bottom of the beaker because the bottom may be warmer than the ice, which could give an inaccurate reading.

It is important to record the states in the beaker (solid ice, melting ice, liquid water, boiling water, steam) because the temperature remains constant during the phase changes. The states indicate the changes in the internal energy of the system, which is not reflected in the temperature.

Learn more about temperature here:

https://brainly.com/question/31055263

#SPJ1

The nuclear reactions involving uranium-235. When uranium-235 is struck by a slow neutron, it can undergo nuclear fission, forming krypton-92 and barium-141 as well as releasing three neutrons. This process is a method of generating these isotopes.

(a) The second nucleus formed in this reaction is barium-141.

(b) In the fission process, a significant amount of energy is released, approximately 200 MeV (million electron volts) per fission event.

This energy is released in the form of kinetic energy of the fission products, kinetic energy of the released neutrons, and the release of gamma photons. The energy released comes from the binding energy of the uranium nucleus, which is converted into these other forms of energy during the fission process. Nuclear fission is used in nuclear power plants to generate electricity due to the large amount of energy it produces.

Know more about Nuclear reactions here :

brainly.com/question/984564

#SPJ11

Answer:

B. fibromyalgia

Explanation:

The chemical symbol for the ion with an atomic anion and a charge of -1, and electron configuration of 2s22p5 is Cl⁻. The Cl⁻ ion has 18 electrons.

This is because the electron configuration matches that of the element chlorine, which is found in group 7 of the periodic table. The Cl⁻ ion is formed when chlorine gains an extra electron to fill its valence shell and achieve a stable octet configuration.

The Cl⁻ ion has 18 electrons in total, as it has gained one extra electron compared to the neutral chlorine atom. The ion now has a full outer shell with 8 electrons, making it stable and less reactive than its neutral counterpart.

The Cl⁻ ion is commonly found in nature, particularly in the form of sodium chloride (NaCl) or table salt. The Cl⁻ ion is also used in various chemical processes, such as in the production of bleach and other disinfectants. Overall, the Cl⁻ ion plays an important role in many chemical reactions and is essential for maintaining the balance of charges in various compounds.

know more about electron configuration here

https://brainly.com/question/29757010#

#SPJ11

The volume of 4.50 moles of nitrogen gas at STP is approximately 101 L. So, the correct answer is 101 L.

At STP (standard temperature and pressure), the volume of one mole of any gas is 22.4 liters. Therefore, to find the volume of 4.50 moles of nitrogen gas at STP, we can simply multiply the number of moles by the molar volume:

At STP (Standard Temperature and Pressure), the volume of 4.50 moles of nitrogen gas (N2) can be calculated using the ideal gas law:

PV = nRT

Where P is the pressure (which is 1 atm at STP), V is the volume, n is the number of moles, R is the gas constant, and T is the temperature (which is 273.15 K at STP).

Rearranging this equation to solve for V, we get:

V = (nRT)/P

Substituting the values for n, R, P, and T, we get:

V = (4.50 mol x 0.08206 L atm K^-1 mol^-1 x 273.15 K)/1 atm

V = 101.3 L

For such more questions on STP:

https://brainly.com/question/27100414

#SPJ11