Chemical Reaction Review: Question Preview (ID: 6002)

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In the formula H2SO4, how many atoms are there?
a) 2 b) 4 c) 6 d) 7
The number of each kind of atom in the reactants of a chemical reaction is
a) greater than the number of each kind of atom in the products. b) equal to the number of each kind of atom in the products. c) less than the number of each kind of atom in the products. d) equal to the number of some of kinds of atoms in the products.
A reaction in which one element is substituted for another in a compound is called a(n)
a) replacement reaction. b) synthesis reaction. c) decomposition reaction. d) exothermic reaction.
The minimum amount of energy required to start a chemical reaction is the
a) exothermic energy. b) activation energy. c) endothermic energy. d) reactant energy.
A material that increases the rate of a chemical reaction by lowering the activation energy is called a(n)
a) catalyst. b) deactivator. c) inhibitor. d) precipitate.
Which of the following is the best evidence for a chemical reaction?
a) gas bubbles b) formation of a new substance c) change of state d) change in temperature
You can balance a chemical equation by changing the
a) subscripts. b) coefficients. c) reactants. d) products.
A chemical reaction in which two elements combine to form a compound is called a
a) synthesis reaction. b) replacement reaction. c) decomposition reaction. d) precipitation reaction.
The scientist found that 2 grams of hydrogen reacted completely with 16 grams of oxygen. What was the total mass of water produced?
a) 8 grams b) 14 grams c) 18 grams d) 32 grams
Salt water is an example of
a) an element. b) a homogeneous mixture. c) a compound. d) a heterogeneous mixture.
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