1.) What is the chemical reaction of heat and light?
A)melting
B)evaporation
C)condensation
D)combustion
2.Which causes physical or chemical changes in a substance?
A)matter
B)heat
C)sound
D)light
A)melting
B)evaporation
C)condensation
D)combustion
2.Which causes physical or chemical changes in a substance?
A)matter
B)heat
C)sound
D)light
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Answer:
In no. 1 the answer is D.
and in no 2. the answer is A.