PLEASE HELP Describe the best method for separating small pieces of iron from a mixture of sand and iron when the particles of sand and iron are identical in size.

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)