Question: A release of energy is a sign that

Answer: a chemical change is taking place

Question: alll of the following factors may speed up a chemical reaction except

Answer: smaller surface area

Question: The substance that is formed in a chemical reaction is called the

Answer: product

Question: which of the following occurs in an endothermic reaction but not in an exothermic reaction

Answer: energy is absorbed

Question: a type of reactions that produces an increase in temperature is

Answer: endothermic

Question: a reactions in which the products contain more chemical energy than the reactants is

Answer: endothermic

Question: which of these represents the release of chemical energy

Answer: burning charcoal in a grill

Question: in a balanced chemical equation, the mass of the reactants is equal to the

Answer: mass of the products

Question: what coefficient is missing in C(2) H(4) + (?) O(2) —> 2CO + 2H(2)O

Answer: 2

Question: Which of the following equations is not balanced?

Answer: Mg + O(2) —-> 2 MgO