Your little sister, who is constantly hungry, begs you to make macaroni and cheese. As you heat up water on the stove, you think back to science class when you studied the changes in states of matter. Tell your sister what change in state occurs when water boils. Then explain to her why this change happens. (Hint: Think about the movement of the particles.)

Which statements best describe the work of marie and pierre curie? check all that apply. they discovered radioactivity. they came up with the term “radioactivity.” they conducted experiments with uranium-containing minerals and pure uranium. they conducted experiments with uranium-containing minerals and photographic plates. they discovered two new radioactive elements.