Answer:
It is the sum of internal energies of two or more substances
Explanation:
<span>C. Their direction of motion is south and north. </span>
Answer:
B
Explanation:
i think with exothermic reactions heat is released
this is what i looked up
hope this helps i took chem last year and think this is what i learned
A chemical element is a substance that is made up of only one kind atom.