1) What do we call the substances that are at the start of a chemical reaction? a) Products b) Reactants c) Yields d) Equations 2) Which of the following are the products of this chemical equation? a) Na b) O2 c) Na2O 3) Fill in the blank: If matter is allowed to escape during a chemical reaction, then it is an example of a(n)... a) Closed System b) Constant System c) Chemical System d) Open System 4) Which of the following is an example of a closed system? a) A jar with a lid on top b) An open ziploc bag c) A beaker without a lid d) An open fire pit 5) What does the law of conservation of mass/ matter state? a) Matter can be destroyed b) Matter can be created c) Matter cannot be created or destroyed d) Matter does not matter 6) Is the following equation balanced or unbalanced? a) balanced b) unbalanced 7) Is the following equation balanced or unbalanced? a) unbalanced b) balanced 8) If there are 6 atoms of carbon in the reactants, according to the law of conservation of mass, how many atoms should be in the products? a) 12 b) 2 c) 6 d) 8 9) Which chemical equation best represents the Law of Conservation of Mass? a) H + O → H2O b) H2 + O2 → H2O c) 2H2 + O2 → 2H2O d) H2 + O2 → 2H2O2 10) How does a balanced chemical reaction support the Law of Conservation of Mass? a) mass of reactants is equal to the mass of products b) mass of reactants is less than the mass of products c) mass of reactants is greater than the mass of the products

Chemical Equations

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