How much heat is needed to change 200 g of water at 100 degrees * C to steam at 100 degrees * C ? Give your answer in calories.

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)