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Grade 8 Chemistry Final Review Quiz

Total questions: 60

Worksheet time: 30mins

Name
Class
Date
1.

Anything that has mass and takes up space

a)

Matter

b)

Energy

c)

Substance

d)

Chemistry

2.

What holds atoms together in a molecule?

a)

density

b)

gravity

c)

physical bonds

d)

chemical bonds

3.

When an atom loses an electron, it becomes

a)

positive

b)

negative

c)

neutral

d)

uncharged

4.

Mendeleev arranged the Periodic Table according to?

a)

name

b)

atomic mass

c)

atomic number

d)

charge

5.

The modern Periodic Table is arranged according to?

a)

name

b)

atomic mass

c)

atomic number

d)

charge

6.

What is a double bond?

a)

a bond between two atoms

b)

one pair of electrons shared between two atoms

c)

two pairs of electrons shared between two atoms

d)

two pairs of electrons shared between four atoms

7.

Density is

a)

matter/solids

b)

volume/mass

c)

gas/liquid

d)

mass/volume

8.

Thermal energy is transferred between objects when they have

a)

the same mass

b)

different masses

c)

different temperatures

d)

the same energy

9.

Which of these is a chemical change?

a)

melting butter

b)

mixing milk and chocolate syrup

c)

breaking glass

d)

burning fuel

10.

Electrons involved in bonding between atoms are

a)

valence electrons

b)

inside the nucleus

c)

closest to the nucleus

d)

positively charged

11.

11. A __________is a group of two or more atoms that are held together by chemical bonds

a)

atom

b)

chemical

c)

molecule

d)

element

12.

12. The fact that matter is not created or destroyed in any chemical or physical change is called the_________

a)

Law of Thermodynamics

b)

Newton's Law

c)

Law of Conservation of Mass

d)

Law of Superposition

13.

13. A(n)____________includes the symbol for the element surrounded by dots.

a)

Element symbol

b)

Clarence symbol

c)

Lewis symbol

d)

Bohr symbol

14.

14. A group of elements in the periodic table is also called a _________________

a)

family

b)

element

c)

period

d)

row

15.

15. Compared to ionic compounds, ____________ generally have lower melting points and boiling points

a)

elemental

b)

bonded

c)

double-bonded

d)

covalent

16.

A change that produces one or more new substances is called a physical change.

a)

True

b)

False

17.

A substance is a single kind of matter that has a specific composition/make-up

a)

True

b)

False

18.

When electrons are transferred between two atoms, a covalent bond is formed

a)

True

b)

False

19.

A polar bond is formed when two atoms share electrons unequally

a)

True

b)

False

20.

Every form of matter has two kinds of properties – physical properties and thermal properties.

a)

True

b)

False

21.

In a periodic table, rows are called

a)

Groups

b)

Families

c)

Periods

d)

Columns

22.

In a Periodic Table, columns are called

a)

Families

b)

Groups

c)

Periods

d)

Rows

23.

The symbol "H" represents which element?

a)

Helium

b)

Hydrogen

c)

Hopium

d)

Hexagen

24.

The symbol "Be" represents which element?

a)

Boron

b)

Bromium

c)

Beryllium

d)

Bismuth

25.

The symbol "Mg" represents which element?

a)

Molybdenum

b)

Maganese

c)

Mendelevium

d)

Magnesium

26.

The symbol "Li" represents which element?

a)

Neon

b)

Silver

c)

Lithium

d)

Lead

27.

The symbol "Au" represents which element?

a)

Gold

b)

Silver

c)

Copper

d)

Lead

28.

The symbol "Fe" represents which element?

a)

Lead

b)

Iron

c)

Nickel

d)

Copper

29.

The symbol "Ca" represents which element?

a)

Calcium

b)

Chlorine

c)

Carbon

d)

Potassium

30.

What is the difference between ionic and covalent bonding?

a)

Ionic bonds share electrons, covalent bonds transfer electrons

b)

Covalent bonds share electrons, ionic bonds transfer electrons

c)

Only ionic bonds can make double bonds

d)

Only ionic bonds can be polar

31.

Substances that are formed during a chemical change are known as:

a)

catalysts

b)

precipitates

c)

products

d)

reactants

32.

Substances that are used up during a chemical change are known as:

a)

catalysts

b)

precipitates

c)

products

d)

reactants

33.

A chemical reaction that absorbs energy in the form of heat is described as:

a)

unbalanced

b)

endothermic

c)

exothermic

d)

coefficient

34.

The only sure evidence for a chemical reaction is:

a)

the formation of a gas

b)

the production of one or more new substances

c)

a color change

d)

changes in properties

35.

In chemical reactions, what does the principle of conservation of mass mean?

a)

atoms are not created or destroyed

b)

the total mass of the reactants is greater than the total mass of the products

c)

the total mass of the reactants is less than the total mass of the products

d)

matter is not changed

36.

What information do you need to write a chemical equation?

a)

reactants

b)

products

c)

chemical formulas

d)

all of the above

37.

CH4 + 2O2 -> CO2 + XH2O. What coefficient must be placed in front of water to balance the equation?

a)

1

b)

2

c)

3

d)

4

38.

A material used to decrease the rate of a chemical reaction is a(n):

a)

inhibitor

b)

catalyst

c)

enzyme

d)

fuel

39.

The number in front of a chemical formula that tells how many molecules or atoms of each reactant takes part in a reaction is called a:

a)

symbol

b)

subscript

c)

coefficient

d)

concentration

40.

Chemicals that act as biological catalysts by speeding up reactions in living things are called

a)

inhibitors

b)

enzymes

c)

fuels

d)

reactants

41.

Which of the following is a synthesis reaction?

a)

2H2O -> 2H2 + O2

b)

2NO + O2 -> 2NO2

c)

2K + 2H2O -> 2KOH + H2

d)

CH4 + 2O2 -> CO2 + 2H2O

42.

Which of the following is a decomposition reaction?

a)

2H2O -> 2H2 + O2

b)

2NO + O2 -> 2NO2

c)

2K + 2H2O -> 2KOH + H2

d)

CH4 + 2O2 -> CO2 + 2H2O

43.

Chemical reactions involve changes in properties and changes in _______________ that you can often observe.

a)

catalyst

b)

energy

c)

activation energy

d)

decomposition

e)

chemical changes

44.

Changes in matter can be described in terms of physical changes and ____________________.

a)

catalyst

b)

energy

c)

activation energy

d)

decomposition

e)

chemical changes

45.

Three types of chemical reactions are synthesis, ________________, and replacement.

a)

catalyst

b)

energy

c)

activation energy

d)

decomposition

e)

chemical changes

46.

All chemical reactions need a certain amount of ________________ to get started.

a)

catalyst

b)

energy

c)

activation energy

d)

decomposition

e)

chemical changes

47.

A(n) _______________________ increases the reaction rate by lowering the activation energy needed.

a)

catalyst

b)

energy

c)

activation energy

d)

decomposition

e)

chemical changes

48.

A precipitate is a solid that forms from liquids during a chemical reaction.

a)

True

b)

False

49.

In a closed system, matter does not enter or leave.

a)

True

b)

False

50.

Factors that can affect rates of reactions include surface area, temperature, concentration, and the presence of coefficients and inhibitors.

a)

True

b)

False

51.

Activation energy is the maximum amount of energy needed to start a chemical reaction.

a)

True

b)

False

52.

When one element replaces another element in a compound, or if two elements in different compounds trade places, the reaction is called a decomposition.

a)

True

b)

False

53.

A mixture that contains a solvent and at least ine solute is called a

a)

mixture

b)

solute

c)

solution

d)

solvent

54.

The largest part of a solution is called the

a)

solution

b)

solvent

c)

solute

d)

colloid

55.

The substance that is dissolved by the solvent in a solution is called the

a)

colloid

b)

suspension

c)

solution

d)

solute

56.

A mixture that contains small, undissolved particles that do not fully dissolve is called a

a)

suspension

b)

soltuion

c)

colloid

57.

A mixture where the solute does not mix with the solvent and can easily be separated (example: creates a solid that collects on top of the mixture) is called a

a)

suspension

b)

colloid

c)

solution

58.

Ture/False: Adding solutes can change the boiling point of a solution

a)

True

b)

False

59.

True/False: Adding Ionic Solutes can make a solution conduct electricity

a)

True

b)

False

60.

True/False: When a solute is slightly mixed into a solvent we say that it is "dissolved"

a)

True

b)

False

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