Reed is trying to create a model that represents the movement of the Earth's crust. He places a beaker with water in it on a heating source that has two wood blocks floating on the surface of the water. As the water heats up it rises to the surface causing the blocks to move away from each other.

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?