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C1,2,3 Exercises

Total questions: 23

Worksheet time: 19mins

Name
Class
Date
1.
Which is true for an exothermic reaction?
a)
The ∆H value is positive
b)
The products have less potential energy than the reactants
c)
The reactants have more kinetic energy than the products
d)
The reactants are below the products in the potential energy diagram
2.

Which statement is NOT TRUE?

Rate = k[A][B]²[C]

a)
Reaction is second order with respect to C.
b)
Reaction is second order with respect to B.
c)
Reaction is zero order with respect to D.
d)
Reaction is first order with respect to A
3.
During an endothermic reaction, heat is ________ and chemical bonds _______.
a)
released, formed
b)
released, broken
c)
absorbed, formed
d)
absorbed, broken
4.

By referring to the figure and overall equation below, which reaction occurs at the cathode?

a)
Ag⁺(aq) + é →Ag(s)
b)
Ni²⁺(aq) + 2 é → Ni(s)
c)
Ag(s) → Ag⁺(aq) + é
d)
Ni(s) → Ni²⁺(aq) + 2é
5.

Standard conditions for measuring enthalpies are as follows EXCEPT:

a)
Temperature of 298 K
b)
Pressure of 101 kPa
c)
Concentration of 1.0 mol dm⁻³
d)

24 degrees celcius

6.

Choose the correct definition of electrode potential.

a)
a measure of the ability of half-cell to remove electrons.
b)
a measure of the ability of half-cell to attract protons towards it.
c)
a measure of the ability of half-cell to attract electrons towards it.
d)
a measure of the potential energy of a half-cell.
7.

The following statements are true regarding electrolytic cells EXCEPT

a)
The electrolytes taken in the two beakers are different.
b)

The reactions taking place are non spontaneous.

c)

A salt bridge is not being used to set up this cell.

d)

It converts electrical energy to chemical energy.

8.
In an electrolytic cell, the negative terminal is the
a)
anode where reduction occurs.
b)
cathode where reduction occurs.
c)
anode where oxidation occurs.
d)
cathode where oxidation occurs.
9.
The standard reduction electrode potential for several half-reactions at 298 K are shown below. Which of the following species is the strongest oxidizing agent?
a)
X⁻
b)
Y³⁺
c)
Z
d)
X₂
10.

Given their standard reduction potentials, which of the species is going to be oxidized?

Cu2+/Cu = 0.34V

Zn2+/Zn = -0.76V

a)

Cu

b)

ZnSO4

c)

CuSO4

d)

Zn

11.

In a redox reaction, the species that loses electrons

a)

is called the cathode

b)

is oxidized

c)

gains mass at the electrode

d)

decreases in oxidation number

12.

In voltaic cells, the salt bridge _______ .

a)

is not necessary in order for the cell to work

b)

allows charge balance to be maintained in the cell

c)

drives free electrons from one half-cell to the other

d)

is tightly plugged with firm agar gel through which ions cannot pass

13.

In the standard notation for a voltaic cell, the double vertical line "||" represents:

a)

a phase boundary

b)

gas electrode

c)

a wire (metal) connection

d)

a salt bridge

14.

In the following reaction


Sn2+ + 2Fe3+ → Sn4+ + 2Fe2+


the oxidizing agent is....

a)

Sn4+

b)

Sn2+

c)

Fe3+

d)

Fe2+

15.

What reaction occurs at the anode?

Ag+/Ag = 0.80V

Ni2+/Ni = -0.25V

a)

Ni2+ + 2e- → Ni

b)

Ag+ + e- →Ag

c)

Ag → Ag+ + e-

d)

Ni → Ni2+ + 2e-

16.
If the enthalpy ter (ΔH) is negative the reaction is ____.
a)
Endothermic
b)
Exothermic
c)
Neutral
17.
A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure.
a)
endothermic; positive
b)
endothermic; negative
c)
exothermic; negative
d)
exothermic; positive
18.
For the formula:
 Q= m c ∆T
The  units for specific heat are:
a)
g /J C
b)
°C/g J
c)
kJ/g
d)
J/g°C
19.

The reaction A + 2B → products was found to have the rate law, k = k[A][B]2. Predict by what factor the rate of reaction will increase when the concentration of B is doubled and the concentration of A remained uncanged

a)

2

b)

4

c)

6

d)

8

20.

The catalyst alters the rate of a chemical reaction by,

a)

providing an alternative pathway with a lower Ea

b)

changing the products formed in the direction of the reaction

c)

providing a surface on which the molecules react

d)

increasing the frequencies of collisions between molecules

21.
More collisions correspond to a: 
a)
Faster reaction rate  
b)
Slower reaction rate
c)
Constant reaction rate 
d)
None of the above
22.

What happened to the rate of reaction, if concentration of reactant is 'zero order'.

a)

rate of reaction will become double

b)

rate of reaction will become triple

c)

rate of reaction will become quadrapel

d)

No affect to the rate of reaction

23.

What is meant by rate of reaction?

a)

Decrease in the quantity of a reactant or product during a chemical reaction

b)

Change in the quantity of a reactant or product over time

c)

Change in the quantity of a reactant or product during a chemical reaction

d)

Change in the quantity of a reactant or product per unit time

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