More Chemical Reaction Review: Question Preview (ID: 6003)


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What does the law of conservation of mass mean during a chemical reaction?
a) The total mass of the reactants is greater than the total mass of the products. b) The total mass of the reactants and products cannot be measured. c) The total mass of the reactants is less than the total mass of the products. d) The total mass of the reactants is the same as the total mass of the products.
A chemical reaction in which heat energy is given off.
a) Endothermic reaction b) Precipitate c) Homogeneous mixture d) Exothermic reaction
A mixture that is evenly mixed; also called a solution.
a) Compound b) Homogeneous c) Precipitate d) Heterogeneous
A pure substance that is created by 2 or more elements chemically reacting and joining together.
a) Compound b) Heterogeneous mixture c) Element d) Homogeneous mixture
The number attached to an element’s symbol in a chemical formula that cannot be changed or added is called a
a) subscript. b) product. c) reactant. d) coefficient.
If the reactants contain 12 carbon atoms and 4 oxygens atoms, what must be true of the products?
a) The product must contain 4 carbon atoms and 12 oxygen atoms. b) The products must contain a total of 16 atoms. c) The product must contain 12 carbon atoms and 4 oxygen atoms. d) The product must consist of carbon to oxygen atoms in a 1:1 ratio
A material that increases the rate of a reaction by lowering the activation energy.
a) Inhibitor b) Precipitate c) Temperature d) Catalyst
A mixture that is unevenly mixed.
a) Compound b) Homogeneous c) Heterogeneous d) Element
A chemical reaction in which heat energy is absorbed.
a) Endothermic reaction b) Synthesis c) Exothermic reaction d) Decomposition
When two elements in different compounds trade places.
a) Synthesis b) Double replacement c) Exothermic reaction d) Single replacement
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