Two compounds are mixed and light is emitted, the color changes, and heat is liberated.
which activity has occurred?
a) chemical reaction
b) chemical mixture
c) chemical nucleus exchange
d) chemical compromise
fast if possible
!

A

Explanation:

The only possible answer is a chemical reaction.

It can't be a mixture. There is too much activity.

I have no idea what a chemical compromise is.

I can't think of a way that just the nuclei can be exchanged.

A is your only answer.

Chemical reaction has occurred when two compounds are mixed and light is emitted, the color changes, and heat is liberated.

Option A

Explanation:

Chemical mixture is a combination of two or more elements or substances and since here light s also emitted, hence that cant be the answer. Chemical nucleus exchange and chemical compromise doesn't deal with the emission of light as they act as intermediate and transfer of nucleus takes place.

Chemical reaction is when two or more compounds mix and the output comes as a result of bombardment. Hence chemical reaction is the best option.

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.