1-How does the Law of Conservation of Energy explain why ice cubes melt in water? 2-What are the two differences between mass and weight?

3-Why does an object’s weight change on the moon but its mass stays the same?

4-Explain how two objects that have the same mass can have different densities.

5-How can you tell if a mixture is homogeneous (solution) or heterogeneous (not a solution)?
6-Identify each of the following examples below as either a homogeneous mixture (solution) or a heterogeneous mixture.
7-What are 3 methods you can use to separate a mixture? Give an example of each.
8-What is the difference between an atom and a molecule?
9-Is a compound a mixture or a pure substance?
10-How are elements arranged on the Periodic Table? by increasing
atomic number.