Samuels PS Chemical Reactions: Question Preview (ID: 31557)


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The number of molecules of a substance involved in a reaction is indicated by the
a) coefficient
b) catalyst
c) reactant
d) product

The total mass of the reactant equal the total mass of the products is the
a) Law of Conservation of Mass
b) Law of Conservation of Charge
c) Law of Conservation of Matter
d) Law of Conservation of Energy

What does the arrow in a chemical reaction mean?
a) yield
b) products
c) reactants
d) equals

The new substances produced by a reaction are the _______?
a) products
b) catalysts
c) reactants
d) coefficients

What principle/law states that every chemical reaction causes a decrease in usable energy and an increase in entropy?
a) second law of thermodynamics
b) first law of thermodynamics
c) second law of kinetic energy
d) first law of kinetic energy

A chemical reaction that releases thermal energy is a ______ reaction.
a) exothermic
b) endothermic
c) balanced
d) kinetic

Entropy means _____.
a) disorder
b) heat
c) mass
d) catalyst

In thermodynamics, the part of the universe being studied is called the _____.
a) system
b) surroundings
c) area
d) section

A chemical reaction that has the same number of each type of atom on each side of the arrow is said to be ______.
a) balanced
b) spontaneous
c) yielded
d) equal

If a chemical reaction can occur by itself, without continuing outside help is it called ______.
a) spontaneous
b) balanced
c) yielded
d) equal

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