Which two changes can indicate that a physical change has occurred in a substance? a. change in color

b. change in temperature

c. change in smell

d. change in size

What are the major types of a chemical compound

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.

Carbon-14 undergoes radioactive decay in the reaction above. determine the type of radiation emitted in this reaction and describe what is happening to the nucleus during this reaction.