What effects do catalysts have on chemical reactions? 1.Catalysts slow down chemical reactions
2.Catalysts reverse chemical reactions
3.Catalysts speed up chemical reactions
4.all of the above

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.