Chem Unit

Question 1

9 elements make up 3.9%:

Answer 1

Ca,
Na,
K,
P
S,
CI,
Mg,
I,
Fe.

Question 2

“energy can neither be created nor destroyed, but it can be changed from one form to another”
Example:

Answer 2

chemical bonds in food can be stored as potential energy for the body’s uses and motion