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What is conserved when one balances a chemical equation?


A) molecules
B) atoms
C) products
D) reactants

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How many moles are in 15.5 g of diphosphorous pentoxide?


A) 0.109
B) 0.330
C) 6.56 *1023
D) 2.20 *103

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In all chemical changes,


A) reactants disappear completely
B) all of the reactants must cease to exist
C) the weight of products and reactants must balance
D) products must be in the same physical state as the reactants

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Which is a statement of the Second Law of Thermodynamics?


A) energy can be converted from one form to another
B) things are getting more screwed up every day
C) there's no such thing as a free lunch
D) you can't get something for nothing

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