CHEMISTRY HIGH SCHOOL

Which reaction occurs spontaneously?(1) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq)
(2) Cl2(g) + 2NaF(aq)--> F2(g) + 2NaCl(aq)
(3) I2(s) + 2NaBr(aq)--> Br2(l) + 2NaI(aq)
(4) I2(s) + 2NaF(aq)--> F2(g) + 2NaI(aq)

Answers

Answer 1
Answer:

The answer is: (1) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq).

In this chemical reaction chlorine change oxidation number from 0 to -1 (reduction) and bromine change oxidation number from -1 to 0 (oxidation).

Chlorine is stronger oxidation reagent than bromine.

In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessin(Ts).

They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.  

Going down in the group, element are weaker oxidazing reagent and less reactive.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
Answer 2
Answer: The reaction occurs spontaneously is Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq). The answer is number 1. The rest of teh choices do not asnwer the question above.

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Although Rutherford is credited with the famous gold foil scattering experiment, he didn’t actually conduct this experiment himself. It was done by two of his assistants, Hans Geiger and Ernest Marsden. Do you think it was fair to name the experiment after Rutherford while ignoring the other two scientists? Why or why not?

Answers

if he was the primary scientist doing it as he did alot of the heavy lifting then yes its ok, but i also think how the others should also me at least mentioned. Or they could just not name the experiment by a person just so its not too biased

Predict what happens when zinc is added to water

Answers

As far as I know Zinc doesn't react with water, but I'm not sure. If it were, Zinc hydroxide and hydrogen would be the products, so it only happens if Zinc is more reactive than hydrogen.

Answer:

Zinc doesn't react with water.

Explanation:

It forms a layer of insoluble zinc hydroxide.

An atom of argon in the ground state tends not to bond with an atom of a different element because the argon atom has (a)a total of two valence electrons (b)more protons than neutrons (c)more neutrons than protons or (d)a total of eight valence electrons

Answers

Answer: Option (d) is the correct answer.

Explanation:

Atomic number of argon is 18 and its electronic configuration is 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6).

Also, it is known that number of electrons in K, L and M shells of argon are 2, 8, 8.

Thus, we can conclude that an atom of argon in the ground state tends not to bond with an atom of a different element because the argon atom has a total of eight valence electrons.

So, as per the octet rule, last sub-shell of argon is completely filled. Hence, it will not form any bond with any other atom.
the answer is a total of eight valence electrons
hope this help

When dilute sulphuric acid is added to barium chloride solution then what happens in a balanced equation?

Answers

Answer:

H2SO4 + BaCl2 = BaSO4 + 2HCl

Explanation:

Writing just the chemical compounds:

H2SO4 + BaCl2 = BaSO4 + HCl

Note that there are 2 Cl ions on the reactant side, but only 1 on the product side.  So lets add a coefficient of 2 to the HCl product:

H2SO4 + BaCl2 = BaSO4 + 2HCl

This had the consequence of adding another H ion to the product side, but we are in luck:  The reactant side contributes 2 H ions from the sulfuric acid, H2SO4.  I wish the rest of life was that easy.

The other elements also balance:

        Reactant     Product

H             2                 2

S              1                  1

O             4                 4

Ba            1                 1

Cl             2                 2

The balanced equation is:

H2SO4 + BaCl2 = BaSO4 + 2HCl

Which fuel is used for nuclear power?a. coal
b. oil
c. natural gas
d. uranium

Answers

Hello,

The fuel used for nuclear power is Uranium.

So uranium is used for nuclear power.

Thanks for using brainly.
Correct option is D. Uranium because atoms of uranium helps to replaces the burning of coal or gas.

Hope this helps you..  :)

The atomic mass unit (amu) isa. the mass of a single atom of carbon
b. one millionth of a gram
c. approximately the mass of a proton
d. approximately the mass of an electron

Answers

That would be c. approximately the mass of a proton
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