which is radioactive decay

Answer:

See explanation below

Explanation:

a) First, as the KCl is a salt, this will ve completely dissociated by water in solution and the reaction taking place would be:

KCl <-----------> K⁺ + Cl⁻

b) According to the above reaction, the Ksp or constant of solubility product will be just the concentration of the products. This is because solid compounds do not contribute in the equilibrium expression, cause they have a constant concentration near to 1. Same thing happens with liquid compounds. So, based on this the Ksp expression for the above reaction is:

KCl(s) <-----------> K⁺(aq) + Cl⁻(aq)

Ksp = [K⁺] [Cl⁻]

c) To find this solubility we need to write the Ksp expression from above, use the given Ksp value and then solve for the solubility:

KCl(s) <-----------> K⁺(aq) + Cl⁻(aq)

Ksp = [K⁺] [Cl⁻]

21.7 = s * s

21.7 = s²

s = 4.66 mol/L

d) To know this, we need to see the concentration of the KCl in solution with the given data of 21.5 moles and the 5 liters of solution:

[K⁺] = [Cl⁻] = 21.5 / 5 = 4.3 mol/L

If we want to calculate the Ksp at this conditions we have:

Ksp2 = (4.3)²

Ksp2 = 18.49

As this value is lower than the actual Ksp value, we can conclude that this solution is undersaturated.

Hope this helps

Answer:

i am dancing and you ok hom

Answer:

Explanation:

YONG ISA PO ETO HINDI KO PO ALAM TOH

Explanation:

Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag

Cu is oxidized

Ag+ is reduced

Cu is the reducing agent

To solve such this we must know the concept of displacement reaction. The balanced reaction of silver nitrate with copper is of  displacement type of reaction.

AgNO[tex]_3[/tex] + Cu [tex]\rightarrow[/tex] Cu(NO[tex]_3[/tex])[tex]_2[/tex] + Ag

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

The reaction between silver nitrate and copper is example of displacement reaction. Copper displaces silver from silver nitrate. to form copper nitrate.

Therefore, the balanced equation is of displacement type of reaction.

AgNO[tex]_3[/tex] + Cu [tex]\rightarrow[/tex] Cu(NO[tex]_3[/tex])[tex]_2[/tex] + Ag

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Answer:

Explanation:

Não sei desculpa

Answer:

can not be determined

Explanation:

because when I tried to calculate it it didn't give me the answer options that was in the pic so it's definitely C

Answer:

Earth

Explanation:

Earth is unique in the fact that we have an oxygen-rich atmosphere

Answer:

Greenhouse gases absorb some of the energy and trap it in the lower atmosphere. Less heat radiates into space, and Earth is warmer. Many greenhouse gases occur naturally. Carbon dioxide, methane, water vapor, and nitrous oxide are naturally present in Earth's atmosphere. Since some of the extra energy from a warmer atmosphere radiates back down to the surface, Earth's surface temperature rises.

Hope this helped! :)

Answer:

milliliters

Explanation:

Is going to be milliliters because in the metric system of measurement,the most common unit of volume are milliliters and liters

Answer:ee

Explanation:

Answer:

can u explain a little more then i will help like what are the four

Explanation:

Answer:

d) U-238

Explanation:

edg 2021

Answer:

91150 g

Explanation:

First we convert 2.5x10³ g of hydrogen gas into moles, using its molar mass:

Then we convert 1250 moles of H₂ into HCl moles, using the stoichiometric coefficients of the reaction:

Finally we convert 2500 moles of HCl into grams, using its molar mass:

Answer:

hot water is thinner than cold water.

Explanation:

The rate of diffusion of a substance has a lot to do with the temperature of a body.

Let us take water for instance, cold water has a greater density than hot water. As a result of this, the molecules in cold water are slower when in motion and more sluggish.

On the other hand, the molecules of hot water are quite faster since hot water has a lower density(thinner than cold water).

Thus, an  increase in temperature will cause an increase in diffusion rate because hot water is thinner than cold water.

Answer:

2. Hydrogen Bonds

Explanation:

Since water is a polar covalent molecule, there is a slight negative and positive end. Due to this, the oxygen end of one water molecule gravitates towards the hydrogen molecules of another water molecule. This accounts for a bunch of weird properties of water, like why ice floats. It's also what makes water the "universal solvent," and gives all life on earth the ability to even exist.

The primary forces of attraction between water molecules in H₂O (I) are hydrogen bonds.

Hydrogen bonding is present in water molecule due to which it exhibits an excellent property of adhesion to itself and to other substances.The hydrogen bonding is a result of electrostatic forces of attraction which are generated by the difference in charge between slightly positive hydrogen ions and slightly negative other ions.

In case of water,hydrogen bonds are formed  between neighboring  hydrogen and oxygen atoms  of the nearby water molecules.The attraction between water molecules itself results in a formation of a bond called as a hydrogen bond.  

It is a type of covalent bond which is formed  between hydrogen and oxygen atoms as one oxygen atom  shares its two electrons with two hydrogen atoms .The positive charge  of one hydrogen atom associates with negative charge of  oxygen atom.These are weak interactions  which are formed between a hydrogen atom each with a partial positive charge and an oxygen atom which is more electronegative than hydrogen.

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Answer:

Explanation:

The net force on electron is electrostatic force between electron and proton in the nucleus .

Fc = [tex]\frac{1}{4\pi\epsilon} \times \frac{e\times e}{r^2}[/tex]

This provides the centripetal force for the circular path of electron around the nucleus .

Centripetal force required = [tex]\frac{m\times v^2}{r}[/tex]

So

[tex]\frac{m\times v^2}{r}=\frac{1}{4\pi\epsilon} \times \frac{e\times e}{r^2}[/tex]

[tex]v^2=\frac{e^2}{4\pi \epsilon m r}[/tex]

[tex]v=(\frac{e^2}{4\pi \epsilon m r})^{\frac{1}{2} }[/tex]

Answer:

Following are the solution to the given question:

Explanation:

For question 1:

For question 2:

A supersaturated solution contains more solute at a given temperature than is needed to form a saturated solution.

Increased temperature usually increases the solubility of solids in liquids.

For example, the solubility of glucose at 25 °C is 91 g/100 mL of water. The solubility at 50 °C is 244 g/100 mL of water.

If we add 100 g of glucose to 100 mL water at 25 °C, 91 g dissolve. Nine grams of solid remain on the bottom. We have a saturated solution.

Hope it helps u

Plz mrk me brainlest

Answer:

2.475 mol of O2  formed.

Explanation:

Given 1.65 moles of KClO3 as the target amount in the reactant, used the coefficient of the balanced chemical reaction involved to determine the number of moles of O2 molecules formed.

x mole of  O2   = 1.65 mol  KClO3 x [(3 mol O2)/ (2 mol KClO3)] = 2.475 mol of O2

x mole of  O2 formed  = 2.475 mol of O2

Answer:

See Explanation

Explanation:

The equation of the reaction is;

ZnO(s) + 2HNO3(aq) --------> Zn(NO3)2(aq) + H2O(l)

a) When you first add ZnO to aqueous HNO3, the powder dissolves as it mixes with the acid.

b) If the student keeps on adding more ZnO powder to the HNO3 after the  reaction between the acid and metal oxide was complete, the powder will no longer dissolve in the acid. At this point, the reaction has attained equilibrium.

Answer:The answer is c

Explanation:

Answer:

True

Explanation:

The tertiary structure of a protein is a complex arrangement formed as the polypeptide chain folds and twists.

This folding & twisting of polypeptide chain leading to its complex structure, is true about tertiary structure of protein. It occurs due to different interactions between side chains of amino acids.

Answer:

you need a theripist or maybe just your girl if this is your question.

Explantion: you are clearly very weird but very cute and ily.

Answer: There are 0.0129 moles of silver present in 1.4 grams of silver (Ag).

Explanation:

Given: Mass of silver = 1.4 g

Number of moles is the mass of substance divided by its molar mass.

As molar mass of silver is 107.86 g/mol. Therefore, moles of silver are calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{1.4 g}{107.86 g/mol}\\= 0.0129 mol[/tex]

Thus, we can conclude that there are 0.0129 moles of silver present in 1.4 grams of silver (Ag).

Answer:

When an electron is hit by a photon of light, it absorbs the quanta of energy the photon was carrying and moves to a higher energy state. So the electron moves to a different orbital where once again its own wavelength is in phase with its self.

hope this helps

have a good day :)

Explanation:

Answer:

In the Bohr atom electrons can be found only in allowed orbits, and these allowed ... that the angular momentum of an electron in orbit, like everything else in the quantum world,

Plants!

No doubt the answer is plants they are one maintaining the temperature, responsible for rains too...

Answer:

Explanation:

\we must convert the mass of NaCl in grams into moles. We do this by dividing by the molecular weight of NaCl (58.4 g/mole). Then, we divide the number of moles by the total solution volume to get concentration. The NaCl solution is a 0.1 M solution.

Answer:

0.125

Explanation:

boom