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1.   What type of intermolecular bonding is found between adjacent molecules of butane?a)   Ionic

b)   Covalent

c)   London forces

d)   Coordinate covalent


2.   When a particular reaction can be expressed as the sum of other reactions the heat of the reaction is the algebraic sum of heats of these reactions. This statement is referred to as:

a)   Nobel's Law

b)   Hess's Law

c)   Boyle's Law

d)   Priestley's Law


3.    In an exothermic reaction:

a)   Potential energy is transformed into bonding energy

b)   Heat is transformed into potential energy

c)   Potential energy is transformed into kinetic energy

d)   Kinetic energy is transformed into bonding energy


4.   The overall rate of any chemical reaction is most closely related to

a)   The number of steps in the reaction mechanism

b)   The overall reaction

c)   The fastest step in the reaction mechanism

d)   The slowest step in the reaction mechanism


5.    Increasing the concentrations of the reactants in a chemical reaction increases the rate of reaction because the:

a)   Collisions become more effective

b)   Frequency of collision increases

c)   Average kinetic energy increases

d)   Activation energy decreases.


6.    In chemical kinetics the sequence of steps by which chemical reactions may occur is called the reaction

a)   Velocity

b)   Rate constant

c)   Mechanism

d)   Order


7.    The activation energy of a reaction may be defined qualitatively as:

a)   The energy supplied to a catalyst

b)   The energy supplied by the attractive forces between molecules

c)   The heat content of the products minus that of the reactants

d)   The energy required by reactant molecules to undergo a reaction


8.    A catalyst speeds up a reaction by:

a)   Lowering the rH for the reaction

b)   Lowering the activation energy for the reaction

c)   Raising the kinetic energy of the particles

d)   Raising the enthalpy of the reactants


9.    The increase in vapour pressure of a liquid caused by an increase in temperature is best explained by which one of the following statements?

a)   More molecules can exist in the gaseous state at a higher temperature, but the average kinetic energy is not changed

b)   More molecules can exist in the gaseous state at a higher temperature and the average kinetic energy is higher

c)   The same number of molecules can exist in the gaseous state at a higher temperature, but the average kinetic energy is lower

d)   The increase in temperature causes an increase in mass of each molecule and therefor a higher pressure


10. Consider the following systems:

I.              A container is half-filled with alcohol, stoppered and allowed to stand for several days

II.           Crystals of KMnO4 are dissolved in water until the water becomes a uniform purple colour and a constant amount of crystal remains in the container.

III.         An ice cube floats in a beaker of water in a normal classroom

IV.         Moth balls are placed in an empty flask which is then stoppered and allowed to stand for several days.


Which of the above are in an equilibrium state?


a)   I and II only

b)   I, II and IV only

c)   II and III only

d)   I, II, III, and IV


11. The equilibrium constant for a chemical reaction can be changed by:

a)   Increasing the temperature

b)   Adding a catalyst

c)   Increasing the concentration of the products

d)   Increasing the concentration of the reactants


12. Consider the following system:

H2(g)    +     I2(g)          ⇔              2HI(g)

A quantity of pure HI(g) was placed in an empty flask at 731 K, stoppered and allowed to come to equilibrium. If a sample of H2(g) is added to the system at equilibrium

a)   [HI] increase and [I2] decreases

b)   [HI] decreases and [I2] increases

c)   [HI] increases and [I2] does not change

d)   [HI] increases and [I2] increases



13.In the reaction A(aq)    +    2B(aq)         ⇔       C(aq)     the equilibrium concentration of A, B and C were found to be 2, 4 and 1 mol/L respectively. The equilibrium constant for the reaction is:

a)   1/32

b)   1/16

c)   8

d)   16


14.A Bronsted-Lowry base is defined as:

a)   A hydroxide ion

b)   A proton donor

c)   An electron pair acceptor

d)   A proton acceptor


15. Which of the following statements about the following equation is correct?

3Cu(s)     +     8HNO3((aq)        ⇔        3Cu(NO3)2(aq)      +    2NO(g)    +     4H2O(l)


a)   Nitrogen is reduced and copper is oxidized

b)   Nitrogen is reduced and oxygen is oxidized

c)   Nitrogen is oxidized and copper is reduced

d)   Hydrogen is oxidized and oxygen is reduced


16. The oxidation number of Sulphur in Na2S2O3 is:

a)   -2

b)   +2

c)   -3

d)   +3


17. In a Galvanic cell oxidation occurs:

a)   At the salt bridge

b)   At the cathode

c)   At the anode

d)   Does not occur in electrolytic cells

 



18. In a Galvanic cell the cathode:

a)   Increases in mass

b)   Decreases in mass

c)   Does not change

d)   Is in equilibrium with the anode


19. For an exothermic reaction:

a)   The heat of the reactants is higher than that of the products

b)   The heat of the reactants is equal to the activation energy of the reaction

c)   The heat of the products is lower than that of the reactants

d)   The heat of the products is equal to the activation energy



THANK YOU

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