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Unit 6 Exam

Total questions: 37

Worksheet time: 26mins

Name
Class
Date
1.

What happens to the equilibrium if we add methane (CH4)?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

2.

What happens to the equilibrium if we remove water (H2O)?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

3.

What happens to the equilibrium if we add hydrogen (H2)?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

4.

What happens to the equilibrium if we remove carbon monoxide (CO)?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

5.

What happens when sodium ions (Na+) are added?

a)

The reaction shifts left, towards the reactants

b)

The reaction shifts right, towards the products

c)

There is no shift

6.

What happens when fluoride ions (Na+) are removed?

a)

The reaction shifts left, towards the reactants

b)

The reaction shifts right, towards the products

c)

There is no shift

7.

What happens when sulfur trioxide (SO3) is added?

a)

The reaction shifts left, towards the reactants

b)

The reaction shifts right, towards the products

c)

The reaction does not shift

8.

What happens when oxygen (O2?) is removed?

a)

The reaction shifts left, towards the reactants

b)

The reaction shifts right, towards the products

c)

The reaction does not shift

9.
Increase in temperature of the reactants can do one of the following
a)
Slow collision frequency
b)
Allow less effective collision between the particles
c)
Neutralise the reaction
d)
increase collision between the particles thus increasing the rate.
10.
Why does a catalyst increase the rate of reaction?
a)
it produces extra energy for the reactants
b)
it increases the speed of the reactant particles
c)
it increases the frequency of particle collisions
d)
it reduces the activation energy of the reaction 
11.
Which of the following increase the reaction rate?
a)
less surface area
b)
lower temperature
c)
an inhibitor
d)
increased concentration
12.
Why don't all collisions between particles cause a reaction?
a)
the particles also need to collide with a catalyst
b)
not all the particles collide with enough energy
c)
not all the particles collide at a high enough temperature
d)
the particles need to collide with each other twice
13.
To slow down a chemical reaction you will do one of the following:
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
14.
A substance that increases speed of chemical reaction without being being changed is called:
a)
Catalyst
b)
Acid
c)
Base
d)
pressure
15.
Activation energy is required to start a chemical reaction. What is activation energy?
a)
The energy needed for a reaction to occur
b)
The minimum amount of energy needed for a reaction to potentially occur
c)
The energy added by a catalyst
d)
The energy possessed by the products
16.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
17.
If more reactants are used in a chemical reaction, more products will be produced. This is because
a)
More reactants cause the reaction to heat up
b)
More reactants take up the same volume
c)
More reactants have more atoms to react to form more products
d)
Too many products can slow down the reaction
18.
This helps to speed up a reaction but does not take part in the chemical reaction. 
a)
coeffiecents
b)
reactants
c)
catalyst
d)
combustion
19.

In the reaction aA + bB cC + dD, the lowercase letters represent:

a)

the concentration in moles per liter

b)

the coefficients of the balanced reaction

c)

the number of moles of each component in the reaction vessel

20.

When a chemical reaction occurs, the physical and chemical properties of the reactants are the same as the properties of the products.

a)

true

b)

false

21.

"Rate" is related to:

a)

volume

b)

time

c)

distance

d)

percentage

22.

The rate of a reaction is measured by how fast a reactant is used up or how fast a _______is formed.

a)

product

b)

catalyst

23.

The rate of chemical reactions generally as the temperature is raised.

a)

increases

b)

decreases

24.

A substance is found to have the following characteristics:


Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water


In what category would the substance be classified?

a)

acid

b)

base

c)

enzyme

d)

fatty acid

25.

HF is...

a)

an acid

b)

a base

c)

a salt

d)

an ionic compound

26.

HNO2

a)

a base

b)

a salt

c)

an acid

d)

an ionic compound

27.
Releases hydrogen in an aqueous solution.
a)
base
b)
strong base
c)
acid
d)
weak base
28.

KOH is ...

a)

an acid

b)

a base

c)

a salt

d)

an ionic compound

29.
Which of the following statements is correct?
a)
Blue litmus paper turns red when placed in a base.
b)
Red litmus paper turns blue when placed in a base.
c)
Blue litmus paper stays blue when placed in an acid.
d)
Red litmus paper stays red when placed in a base.
30.

Bases have a pH of

a)

7

b)

Less than 7

c)

More than 7

31.

Which of these pH values represent an acid?

a)

4

b)

8

c)

10

d)

12

32.

Milk is a very weak acid. What might its pH value be?

a)

6.5

b)

7.8

c)

4.2

d)

12.2

33.

Which of the following is an acid?

a)

vinegar

b)

bleach

c)

sugar in water

d)

starch in water

e)

toothpaste in water

34.

Which of the following pH values represents a base?

a)

2.1

b)

4.6

c)

6.8

d)

8.1

35.

Which of the following is a base?

a)

baking soda in water

b)

orange juice

c)

vinegar

d)

lemonade

36.

Ocean water is only slightly basic. What might its pH value be?

a)

5

b)

8

c)

12

d)

2

37.

If the substance is neutral, what would the pH be?11

a)

3

b)

5

c)

7

d)

9

e)

11

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