A group of water molecules are held together by
A. salt.
B. double covalent bonds.
C. polar covalent bonds.
D. ionic bonds.
E. hydrogen bonds.
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Question 2) If the products of a chemical reaction contain less potential energy than the reactants,
A. energy has been stored in the molecular bonds of the product.
B. energy has been released by the breaking of molecular bonds.
C. the reaction will be reversible without additional energy input.
D. a synthesis reaction is likely to have occurred.
E. All of these choices are correct.
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Question 3) Enzymes are proteins that increase the rate of chemical reactions by
A. increasing the activation energy of the reaction.
B. increasing the concentration of the reactants.
C. decreasing the activation energy of the reaction.
D. adjusting the temperature of the reaction.
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Question 4) Which of the following factors will influence the rate of chemical reactions?
A. temperature
B. concentration of reactants
C. presence of catalysts
D. presence of enzymes
E. All of these factors will influence the rate of chemical reactions.
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Question 5) For most chemical reactions, an increase in temperature will cause the reaction rate to
A. remain unchanged.
B. increase.
C. decrease.
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Question 6) A substance that will increase the rate of a chemical reaction without being permanently changed is called a/an
A. oxidator.
B. reducing agent.
C. catalyst.
D. solute.
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Question 7) Kinetic energy is
A. movement of ions or electrons.
B. energy that moves in waves.
C. energy that flows between objects with different temperatures.
D. the form of energy that actually does work.
E. stored energy that could do work but is not doing so.
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Question 8) The conversion between different states of energy (e.g. potential energy to kinetic energy):
A. is not 100 efficent
B. is 100 efficent
C. typically generates heat
D. is not possible, energy can not change its state.
E.
is not 100 efficient and typically generates heat
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Question 9) Heat energy is
A. energy that flows between objects with different temperatures.
B. movement of ions or electrons.
C. stored energy that could do work but is not doing so.
D. energy that moves in waves.
E. the form of energy that actually does work.
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Question 10) The minimum amount of energy that reactants must have to start a chemical reaction is called
A. potential energy.
B. mechanical energy.
C. kinetic energy.
D. activation energy.
E. electromagnetic energy.
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