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Daily Concept Quiz
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1

Which of the following is an oxide of an element?
A)Rust
B)Water
C)Granite
D)All of these
E)None of these
2

A mole of a substance
A)is a specific number of molecules of that substance.
B)is a quantity that varies from one element to the next.
C)depends on the atomic mass of the substance.
D)is smaller for gases than for liquids.
3

If a substance is 2.0 u, how many grams is this?
A)12.04×1023 g
B)3.32×10-24 g
C)2.0 g
D)You can’t find this until you know what kind of substance it is.
4

In the chemical formula 2SO2+O2+2H2O → 2H2SO4, the “2” in front of SO2 represents
A)the number of molecules of SO2.
B)the number of moles of SO2.
C)neither of these.
D)both of these.
5

If you dissolve a substance in water and the container turns very cold, what kind of reaction occurred?
A)Endothermic
B)Exothermic
C)Both of these
D)Neither of these
6

The reaction needed to form the stable compound H2O2 (hydrogen peroxide)
A)is strongly endothermic and the electrons in the atoms have a higher potential energy after formation than before.
B)is strongly exothermic and the electrons in the atoms have a higher potential energy after formation than before.
C)is strongly endothermic and the electrons in the atoms have a lower potential energy after formation than before.
D)is strongly exothermic and the electrons in the atoms have a lower potential energy after formation than before.
7

The energy that must be supplied to split up a hydrogen molecule (H2) to allow the constituent hydrogen atoms to form new molecules is
A)chemical energy.
B)activation energy.
C)fusion energy.
D)fission energy .
E)potential energy.
8

When a reaction reaches a state of chemical equilibrium
A)the reaction stops.
B)the amounts of each material in the reaction are the same.
C)the amounts of each material in the reaction don’t change.
D)a reverse reaction just begins running.
9

If a system is in chemical equilibrium and the temperature is increased
A)the system will eventually reach a new equilibrium state.
B)the endothermic reaction will dominate.
C)the exothermic reaction will dominate.
D)the reaction will stop completely.
10

A fuel cell is
A)a battery such as you might find at a grocery store.
B)does not produce energy using oxidation-reduction reactions.
C)is in wide use in the public today.
D)all of these.
E)none of these.





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