A scientific theory is .What have chemists done to help people conserve energy?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.