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Unit 1: Matter and Chemical Equations Review 8th Grade Science

Total questions: 73

Worksheet time: 1hrs 14mins

Name
Class
Date
1.
Which is an example of a compound?
a)
Kool-Aid
b)
Water (H2O)
c)
Aluminum (Al)
d)
Air
2.

The Law of Conservation of Mass states Matter is NEITHER created nor destroyed.

a)

True

b)

False

3.
The number in front of a compound or element is a 
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
4.

The Coefficient (3) in the Chemical Formula, 3H2O, tells you how many _____________ there are.

a)

Atoms of Hydrogen

b)

Atoms of Oxygen

c)

Atoms of Water

d)

Molecules of Water

5.
The number to the lower side of an element is a 
a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
6.

How many oxygen atoms are in this chemical formula?

a)

6 oxygen atoms

b)

2 oxygen atoms

c)

3 oxygen atoms

d)

4 oxygen atoms

7.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
8.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
9.
How many elements does PbNO3 have?
a)
2
b)
3
c)
4
d)
5
10.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
11.
Which equation best represents the law of conservation of mass? 
a)
A
b)
B
c)
C
d)
D
12.

Is this equation balanced or unbalanced?

CH4 + 2O2--> CO2+ 2H2O

a)

balanced

b)

unbalanced

13.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
14.
Which is the stronger acid?
a)
pH 1
b)
pH 4
c)
pH 8
d)
pH 13
15.
Which of the following is most likely to be basic:
a)
Lemon juice
b)
Vinegar
c)
Laundry detergent
d)
Coke
16.

Weaker bases have a pH closer to...

a)

8

b)

14

c)

0

d)

4

17.

Stronger acids have a pH closer to...

a)

7

b)

14

c)

0

d)

9

18.

Bases turn blue litmus paper red.

a)

True

b)

False

19.
Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.
a)
Acids; pH less than 7
b)
Acids; pH greater than 7
c)
Bases; pH greater than 7
d)
Bases; pH less than 7
20.

Most foods would be considered

a)

bases

b)

acids

c)

neutral

21.
What does corrosive mean?
a)
That a substance is a strong base.
b)
That a substance is neutral.
c)
That a substance can easily wear away
d)
The substance is the strongest acid
22.

David was conducting a science experiment and found a substance with a pH greater than 7. This substance is a(n) _______.

a)

Base

b)

Acid

c)

Buffer

d)

Water

23.

A mixture that has visually distinguishable components

a)

homogenous mixture

b)

elemental mixture

c)

heterogeneous mixture

d)

compound mixture

24.

A mixture that appears uniform throughout

a)

homogenous mixture

b)

heterogenous mixture

c)

elemental mixture

d)

compound mixture

25.

What 2 types of matter are pure substances?

a)

elements and compounds

b)

elements and mixtures

c)

mixtures and compounds

d)

atoms and elements

26.

Which form of matter is represented by single argon atoms?

a)

Element

b)

Compound

c)

Mixture

d)

Colloid

27.

Which state of matter is represented by the double oxygen atoms?

a)

Element

b)

Compound

c)

Mixture

d)

Solution

28.

Which form of matter is represented in the image?

a)

element

b)

compound

c)

mixture

d)

solution

29.

Which form of matter is represented by the joined carbon and oxygen atoms?

a)

element

b)

compound

c)

mixture

d)

colloid

30.

The atoms of different elements can join together to form

a)

elements

b)

compounds

c)

mixtures

31.

Which type of mixture is represented in this image?

(Think: Are the particles spread out evenly throughout, or are the particles chunked together?)

a)

Compound mixture

b)

Heterogeneous mixture

c)

Homogeneous mixture

d)

Elemental mixture

32.

Which type of mixture is represented in this image?

(Think: Are the particles spread out evenly throughout, or are the particles chunked together?)

a)

Homogeneous mixture

b)

Elemental mixture

c)

Heterogeneous mixture

d)

Compound mixture

33.

Which is an example of a heterogenous mixture?

a)

Lucky Charms cereal

b)

cranberry juice

c)

brass metal

d)

salt dissolved in water

34.

Which is an example of a homogenous mixture?

a)

Lucky Charms cereal

b)

salt dissolved in water

c)

orange juice with LOTS of pulp

d)

trail mix

35.

How many atoms of Carbon are in this equation?


HʒC5O4

a)

3

b)

1

c)

5

d)

4

36.

Identify the Coefficient.

3BeH5Si8

a)

5

b)

3

c)

1

d)

8

37.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

38.

Coefficients in chemical formulas...

a)

Multiply just the first atom

b)

Add to the subscripts at the end of the molecule

c)

Multiply elements without subscripts

d)

Multiply EVERYTHING!

39.

How do you find how many nuetrons are in an atom?

a)

subtract the atomic number by the atomic mass

b)

its the same as the protons

c)

its the atomic mass

d)

add the atomic number and the atomic mass

40.

what part of the atom tells you what element it is?

a)

Protons

b)

nuetrons

c)

electrons

d)

electron cloud

41.

How do you find the amount of valence electrons in an atom?

a)

they are the same as the atomic mass

b)

they are the electrons on the outer shell of an atom

c)

they are on the very first shell of an atom

d)

they are the same as regular electrons

42.

how many groups are there on the periodic table?

a)

10

b)

15

c)

7

d)

18

43.

how many periods are on the periodic table?

a)

6

b)

7

c)

18

d)

10

44.

how can you tell an atoms reactivity?

a)

the valence electrons

b)

protons

c)

neutrons

d)

atomic number

45.

how can you tell the number of energy shells an atom has?

a)

the period number

b)

the group number

c)

the atomic mass

d)

the valence electrons

46.

What is the identity of Element III

a)

Hydrogen

b)

Krypton

c)

Calcium

d)

Argon

47.

What is the identity of Element II

a)

Hydrogen

b)

Magnesium

c)

Calcium

d)

Rubidium

48.

What is the identity of the of Element B atomic model?

a)

Phosphorus

b)

Hydrogen

c)

Nitrogen

d)

Oxygen

49.

How many valence electrons does Selenium (Se) have?

a)

78

b)

6

c)

34

d)

4

50.

What is the TOTAL number of elements/atoms in this Chemical Formula?

C12H24O12

a)

3

b)

24

c)

36

d)

48

51.

Surface tension is the property of water in which...

a)

water molecules at the surface tend to stick together.

b)

water spills easily.

c)

water tends to be see-through.

52.

Refer to the picture of water sticking to a leaf; this is occurring because of:

a)

Adhesion

b)

Cohesion

53.

Describe COHESION.

a)

Water molecules attracted to other substances.

b)

Water molecules climbing upwards against the force of gravity.

c)

Water molecules dissolving many substances because of its polarity.

d)

Water molecules attracted to other water molecules.

54.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
55.
tendency of molecules of the same kind to stick to one another
a)
cohesion
b)
adhesion
c)
solution
d)
polar molecule
56.
Water droplets take a spherical shape (as pictured) because of ____________
a)
adhesion
b)
cohesion
c)
capillary action
d)
solubility
57.
Water beads up on the surface of a penny because of this property.
a)
Adhesion
b)
High Surface Tension
c)
Universal Solvent
d)
Changes in Density
58.
Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water?
a)
adhesion
b)
surface tension
c)
solvent properties
d)
nonpolar
59.

Water's ability to stick to glass is

a)

adhesion

b)

cohesion

c)

surface tention

d)

capillary action

60.
What is adhesion?
a)
Water's ability to stick to itself
b)
Water's ability to stick to other substances
c)
The strength of the cohesion of all the water molecules combined
d)
Tape, glue and other adhesives
61.

Refer to the picture; this is occurring because of:

a)

Cohesion

b)

Adhesion

c)

Capillary action

d)

Surface tension

62.

Capillary Action can pull the water _____

a)

Upwards

b)

Downwards

63.

Which property of water allows water to climb up a tree's root system to the leaves?

a)

Cohesion

b)

water's density

c)

Polarity

d)

Capillary Action

64.
The tightness across the surface of water that enables paper clips to float is ____________.
a)
adhesion
b)
capillary action
c)
surface tension
d)
polarity
65.

What is the term for water's ability to defy gravity and climb up a tube?

a)

Capillary Action

b)

Specific Heat

c)

Universal Solvent

d)

Magic

66.

Water sticks well to many materials. What term relates to this property of water?

a)

cohesion

b)

adhesion

c)

density

d)

surface tension

67.

A measure of how difficult it is to stretch or break the surface of a liquid

a)

Cohesion

b)

Adhesion

c)

Surface Tension

68.

The pH of pure water is what?

a)

7

b)

8

c)

2

d)

14

69.

A process powered by adhesion that causes water molecules to move upward through a narrow tube such as the stem of a plant is called...

a)

polar molecule

b)

surface tension

c)

capillary action

d)

specific heat

70.

A measure of how difficult it is to stretch or break the surface of a liquid is called...

a)

specific heat

b)

polar molecule

c)

capillary action

d)

surface tension

71.

Water molecules ________ since the slightly positive portion of a water molecule is attracted to the slightly negative portion of the next water molecule.

a)

stick together

b)

spread out

72.
Which is the Law of Conservation of Matter?
a)
matter cannot be created or destroyed, it only changes form
b)
matter can be created but it cannot be destroyed, it never changes form
c)
matter can be destroyed but it cannot be created, it usually just changes form
d)
matter is an unproven theory created by Hans Geiger
73.

So, the Law of Conservation of Mass would tell us that the mass of all the REACTANTS must __________ the mass of all PRODUCTS in a chemical reaction.

a)

equal

b)

be greater than

c)

be less than

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