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Grade 8 Review Quiz -Unit 2

Total questions: 35

Worksheet time: 18mins

Name
Class
Date
1.

What is the atomic number of carbon?

a)

20

b)

12

c)

6

d)

30

2.

What is the chemical symbol for gold?

a)

Fe

b)

Ag

c)

Hg

d)

Au

3.

What is the process of a substance changing from a solid to a gas without passing through the liquid phase called?

a)

sublimation

b)

vaporization

c)

condensation

d)

melting

4.

What is the chemical name for table salt?

a)

Chlorine sodium

b)

Sodium chlorate

c)

Saltium chloride

d)

Sodium chloride

5.

What is the lightest element in the periodic table?

a)

Gold

b)

Carbon

c)

Hydrogen

d)

Oxygen

6.

What is the chemical symbol for iron?

a)

Io

b)

Fe

c)

In

d)

Ir

7.

What is the process of a substance changing from a gas to a liquid called?

a)

Solidification

b)

Evaporation

c)

Condensation

d)

Sublimation

8.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
a)
strongly acidic
b)
slightly acidic
c)
strongly basic
d)
slightly basic
9.

The table shows the pH of several solutions. Which solution is the most acidic?

a)

vinegar

b)

milk

c)

water

d)

bleach

10.

Zn(OH)2 is an example of a...

a)

acid

b)

base

c)

salt

d)

water

11.

Four substances were tested for pH, lemon juice (pH 2), baking soda (pH 9), bleach (pH 12), and milk (pH 6). Which of the following correctly lists the substances from most basic to acidic?

a)

lemon juice, milk, baking soda, bleach

b)

bleach, baking soda, milk, lemon juice

c)

milk, lemon juice, baking soda, bleach

d)

baking soda, bleach, lemon juice, milk

12.

Which of these is a property of acidic solutions?

a)

they taste sour

b)

they feel slippery

c)

they are in many cleaning products

d)

they taste bitter

13.

Which of the following statements is true concerning acids and bases?

a)

acids and bases don't react with each other

b)

acids mixed with bases neutralize each other

c)

acids mixed with bases make stronger bases

d)

acids mixed with bases make stronger acids

14.

Neutral solutions have a pH of:

a)

0

b)

1

c)

7

d)

14

15.

What element is represented in this Bohr Model?

a)

Carbon

b)

Hydrogen

c)

Aluminum

d)

Lithium

16.
What is the name of this element?
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon
17.
How many valence electrons?
a)
2
b)
3
c)
5
d)
10
18.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
19.
The horizontal row on the periodic table is called a
a)
group
b)
family
c)
period
d)
atomic number
20.

How many outer electrons does Carbon have?

a)

4

b)

5

c)

6

d)

7

21.
Ionic bonds form between two ions that have...
a)
ionic compounds
b)
negative charges
c)
positive charges
d)
opposite charges
22.

Covalent bonds are formed when_____________.

a)

electrons are transferred

b)

electrons are shared

c)

electrons vanish

d)

protons absorb electrons

23.

Which of the following is the correct Lewis dot structure for the molecule fluorine (F₂)?

a)

A

b)

B

c)

C

d)

D

24.

Why do all bonds form?

a)

so the number of protons equals the number of electrons

b)

so an atom can become unstable

c)

to fill the outermost energy level

25.

When atoms bond together, a _________ is formed.

a)

Mixture

b)

Compound

c)

Pair

d)

Solution

26.

Covalent bonds form between

1. Metal - Non-metal

2. Non-metal - Non-metal

3. Metal - Metalloid

4. Non-metal - Metalloid

a)

1 and 2

b)

2 and 3

c)

3 and 4

d)

2 and 4

27.

In ionic bonds, electrons are

a)

Gained or lost

b)

Shared

c)

Mixed randomly

d)

Negatively charged

28.

Which bond has HIGH melting and boiling point?

a)

Covalent

b)

Ionic

c)

Chemical

d)

James

29.

Solutions are made up of...?

a)

Solutes and insolubles

b)

Solubles and solutes

c)

Solutes and solvents

d)

Solubles and solvents

30.

In a solution of saltwater, what is the solute?

a)

Water

b)

Saltwater

c)

Salt

d)

There is no solute, it is insoluble

31.

What are the three types of mixtures?

a)

Suspension, colloid and solution

b)

Solution, solute and solvent

c)

Colloid, insoluble and soluble

d)

Distillate, colloid and suspension

32.

Name the separation technique

a)

Centrifuge

b)

Bunsen burner

c)

Distillation

d)

Evaporation

33.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
34.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
35.
The law of conservation of mass states that....
a)
Matter can be made
b)
Matter can be destroyed
c)
Matter can neither be made or destroyed
d)
Matter can evaporate

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