1. which of these is a chemical property of a substance?

a. reactivity

b. color

c. boiling point

d. melting point

question 2

which of these is true of a chemical reaction?

a. energy is always released.

b. energy is always absorbed.

c. energy is either released or absorbed.

d. energy is not transferred.

question 3

which of these is an example of a chemical change?

a. leaving cheese out to get moldy

b. smelling sprayed perfume

question 3

which of these is an example of a chemical change?

a. leaving cheese out to get moldy

b. smelling sprayed perfume

c. feeling ice melt on your skin

d. crushing ice with a hammer

question 4

which of these is an example of a physical change?

a. melting a substance

b. breaking chemical bonds

c. forming chemical bonds

d. nuclear decay

question 5

which of these is an example of a physical change?

a. gasoline burning

b. metal denting

c. iron rusting

d. silver tarnishing