During a phase change such as melting or boiling, the energy added to a substance A. does not change the temperature of the substance
B. decreases the temperature of the substance
C. increases the temperature of the substance
D. causes the molecules to bond together more tightly

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of