What is the source of continuous heat and energy that we receive from the sun

For the following, determine the type of reaction and then give products.

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.