Sodium is a reactive metal. chlorine is a reactive gas. these two elements combine to form a a) stable compound called table salt. b) new element called sodium chloride. c) reactive compound that explodes in water. d) mixture that is easily separated by dissolving in water.

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