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 high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..