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Multiple Choice
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1

Which statement is not true?
A)Since electrons, atoms, molecules and ions are moving, they possess kinetic energy.
B)Energy is being converted between potential energy and kinetic energy as particles within chemicals bump into each other.
C)The energy released by chemical reactions is due to the change of mass to energy.
D)Chemical reactions either release or absorb energy.
2

Which of the following is true regarding endothermic and exothermic reactions?
A)a reaction which releases energy is exothermic
B)a reaction which absorbs energy is endothermic
C)in an exothermic reaction, heat is released
D)in an endothermic reaction, heat is absorbed
E)all of the above are true
F)only a and c are true
G)only b and d are true
3

Since every chemical change involves a gain or loss of energy
A)energy is transferred from the chemicals into the surroundings
B)energy from the surroundings is transferred into the chemicals
C)energy is transferred either from the surroundings into the chemicals or from the chemicals to the surroundings
D)energy is not transferred
4

Entropy is a measure of
A)energy of the particles
B)disorder of the particles
C)order of the particles
D)compactness of the particles
5

The specific heat of aluminum is 0.214 cal/g·°C. Calculate the heat necessary to raise the temperature of 55.5 g of aluminum from 23.0 to 48.6 °C.
A)109 cal
B)273 cal
C)577 cal
D)304 cal
E)347 cal
6

All of the following are factors that affect reaction rate except
A)temperature of reactants
B)concentration of reactants
C)physical state of reactants
D)density of reactants
7

A catalyst is effective because
A)it increases the number of molecules with energy equal to or greater than the activation energy
B)it increases the temperature of the molecules in the reaction
C)it increases the number of collisions between molecules
D)it lowers the activation energy for the reaction
8

What is the correct equilibrium expression for the following reaction? 2Cu(s) + O2(g) ---> 2CuO(s)
A)K = 1/[O2]2
B)K = [CuO]2/[Cu]2
C)K = [CuO]2/[Cu]2[O2]
D)K = 1/[O2]
E)K = [O2]
9

Consider the following reaction in the gas phase: H2 + I2 --> 2 HI When the pressure is increased by decreasing the volume of the flask:
A)more HI will be produced
B)more H2 and I2 will be produced
C)the results will depend on what the amounts of each are.
D)the amount of HI remains the same
10

Identify the following that is a spontaneous process_____________.
A)ice melting at room temperature
B)an iron nail rusting
C)water evaporating at room temperature
D)all of the above





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