Classify each of the following as a pure substance or a mixture. Gold is a pure substance. mixture.

Why does his teacher ask him to balance the equation by including the correct coefficient

What are the two largest greenhouse gases

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.