Physics? Am I correct?

Question 13

An ice cube is placed on a hot stove. Which of these statements best describes how heat moves between the ice cube and the stove?

a.) Heat moves from the ice cube to the stove through conduction.

b.) Heat moves from the stove to the ice cube through conduction.

c.) Heat moves from the ice cube to the stove through convection.

d.) Heat moves from the stove to the ice cube through convection.

I think it's a.

Question 14

How does the motion of particles in a gas change as the gas cools?

a.) They move more slowly.

b.) They move in a more circular pattern.

c.) They move faster.

d.) They move more randomly.

I think it's d.

Question 15

Neon (Ne) is very unreactive. Which of these elements most likely shares this property?

a.) sodium (Na)

b.) xenon (Xe)

c.) boron (B)

d.) phosphorus (P)

I think it's b.

Question 16

What happens to a sheet of copper as the average kinetic energy of the copper molecules decreases?

a.) It melts.

b.) It expands.

c.) It gets cooler.

d.) It gains energy.

I think it's c.

Question 17

Which describes how chemical changes are different from physical changes?

a.) Chemical changes can be measured, but physical changes cannot.

b.) Chemical changes involve the formation of a new substance.

c.) Chemical changes release energy, but physical changes absorb energy.

d.) Chemical changes cannot be caused by oxygen.

I think it's b.

Question 18

Which state of matter has both a fixed shape and a fixed volume?

a.) solid

b.) liquid

c.) gas

d.) plasma

I think it's d.

Question 19

Which best describes why scientific models change over time?

a.) Models can be changed by scientists who are more famous than previous scientists.

b.) As technology advances, new experiments often expose problems in accepted theories.

c.) Scientists tend to value new theories because they are more exciting.

d.) A newer theory is more valid because it uses more mathematics.

i think it's c.

Question 20

Why is having a scientific model of the atom important?

a.) The model allows us to predict how atoms will behave in certain situations.

b.) The atom is the smallest known particle in the universe.

c.) Models are used to prove which scientist is correct in a debate.

d.) It is impossible to predict how atoms behave in nature.

I think it's a.

Can someone please tell me if I am correct? I do not want to turn in my paper and have everything wrong.