Free Printable Chemistry: Reactions

1.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

2.

In an exothermic reaction, heat is ...

a)

taken in

b)

given out

3.

$6\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2$

a)

endothermic reaction

b)

exothermic reaction

4.

Solid sodium carbonate is added to vinegar in a beaker and stirred.

The water in the watch glass freezes.

Which statement about the reaction explains why the water freezes?

a)

It is a redox reaction.

b)

It is an endothermic reaction.

c)

It is catalysed by sodium carbonate.

d)

It is thermal decomposition.

5.

What letter represents the activation energy?

a)

A

b)

B

c)

C

d)

D

6.

Which factors increase the rate of a reaction.

a)

increasing temperature

b)

increasing concentration

c)

increasing surface area

d)

all of these

7.

Smaller particle size allows for a _________ surface area to be exposed for the reaction.

a)

larger

b)

smaller

8.

Why does a higher temperature increase the rate of a reaction?

a)

it increases both the frequency and energy of particle collisions

b)

it only increases the frequency of particle collisions

c)

it only increases the energy of particle collisions

d)

it reduces the activation energy of the reaction

9.

Why does a higher concentration increase the rate of reaction?

a)

it increases the amount of reactants

b)

it lowers the activation energy

c)

it increases the energy of particle collisions

d)

it increases the frequency of particle collisions

10.

Adding a catalyst ___________ the activation energy.

a)

Raises

b)

Lowers

c)

Doesn't affect

d)

Inreases

11.

How could we make this reaction happen more quickly?

a)

Decrease the concentration of the acid

b)

crush the chalk to increase the surface area

c)

Put the test tube in an ice bath

12.

A represents

a)

Potential Energy of Products

b)

Potential Energy of Reactants

c)

Change in Enthalpy

d)

Activation Energy

13.

D represents

a)

Potential Energy of Products

b)

Potential Energy of Reactants

c)

Change in Enthalpy

d)

Activation Energy

14.

Is the following reaction endothermic or exothermic

a)

endothermic

b)

exothermic

15.

Is the following reaction endothermic or exothermic

a)

endothermic

b)

exothermic

16.

4. When a system at equilibrium is subject to change the system tries to minimize the change by?

a)

dissappearing

b)

going to the direction where it will relieve the stress

c)

expand

17.

3. In change in pressure and volume, if the pressure decreases the system will shift to the?

a)

location of more moles

b)

shift to the left

c)

no shift

18.

9. This Law "states that any change to system at equilibrium wil result in an expected shift that countereact the change"

a)

Le Chatelier Principle

b)

Boyles Law

c)

Law of thermodynamics

19.

10. The factors that affect the system at equilibrium are the following exept

a)

Temperature

b)

Change in Matter

c)

Concentration

20.

2SO₂(g)+O₂(g)⇌2SO₃(g)

Removing O₂(g) will

a)

shift equilibrium right

b)

shift equilibrium left

c)

increase pressure

d)

have no change

21.

Changes in pressure will only affect substances that are in the __________ state.

a)

gaseous

b)

liquid

c)

solid

d)

plasma

22.

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the right, the concentration of O₂ will ___________.

a)

increase

b)

decrease

c)

remain the same

d)

double

23.

CoCI₄^2-+6H₂O →Co(H₂O)₆²⁺ + 4CI^-.

What would happen when H₂O is added?

a)

Position of equilibrium will shift to left (and become more blue)

b)

Position of equilibrium will shift to right (and become more pink)

c)

K_eq will increase as H₂O is added

d)

Position of equilibrium will shift to left to reduce the added H₂O

24.

1N₂ + 3H₂ →2NH₃

When the pressure on the system is increased, the equilibrium position shifts to the right. Why?

a)

To increase the amount of products

b)

To reduce the pressure, as the right side has fewer molecules of gas

c)

K_eq will increase when it is shifted to the right

d)

To increase the pressure, as the right side has more molecules of gas

25.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

26.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

27.

What reaction has the following general formula:
$C_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

28.

What type of reaction is the following:
$BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

29.

What type of reaction is the following:
$Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

30.

What type of reaction is the following:
$3CuS\ +2Al\ ->\ Al_2S_3+3Cu$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

31.

What type of reaction is the following:
$2C_4H_{10}\ +13O_2\ ->\ 8CO_2+10H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

32.

What type of reaction is the following:
$Na_2S\ +2HCl\ ->\ H_2S+2NaCl$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

33.

Identify the following chemical reaction.

Pb + FeSO₄ ----> PbSO₄ + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

Chemistry: Reactions

Total questions: 33

Worksheet time: 20mins

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