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SMS 8th Grade Science Semester Review

Total questions: 59

Worksheet time: 32mins

Name
Class
Date
1.
____________ is anything that has mass and takes up space.
a)
matter
b)
compound
c)
particle
d)
subatomic
2.

All matter is composed of __________.

a)

compounds

b)

atoms

c)

water

d)

H2O

3.
_____________ are the smallest unit of matter that retains the identity of the substance.
a)
compounds
b)
atoms
c)
water
d)
H2O
4.
All atoms have a ___________ in the center.
a)
electron
b)
cloud
c)
nucleus
d)
particle
5.
The nucleus of the atom has  the 
___________ and ___________ in it.
a)
protons and neutrons
b)
electrons and neutrons
c)
protons and electrons
6.
A proton has a ___________ charge.
a)
positive
b)
negative
c)
neutral
7.
The electrons are in the electron _________.
a)
region
b)
area
c)
cloud
8.
An electron has a ___________ charge.
a)
positive
b)
negative
c)
neutral
9.
Protons, neutrons, and electrons are called ____________ particles.
a)
atomic
b)
subatomic
c)
nucleus
10.

Microwave ovens heat food through the process of

a)

conduction.

b)

convection

c)

radiation.

d)

stratification

11.

What 2 elements make up water?

a)

Hydrogen and Carbon

b)

Carbon and Oxygen

c)

Hydrogen and Oxygen

d)

Oxygen and Helium

12.

What is the atomic mass for this element?

a)

6

b)

12.0107

c)

6.0107

d)

18.0107

13.

How many neutrons are in an Calcium atom?

a)

20

b)

40.08

c)

60

14.
Which of the following is a chemical change?
a)
Iron rusting 
b)
Glass breaking
c)
Clothing ripping
d)
Hair cut
15.
Which of the following is evidence of a chemical change?  
a)
Change in state
b)
No new substance is formed
c)
Bubbles forming
d)
Change in shape
16.
Which of the following is an example of a physical change, and why? 
a)
Fire burns in fireplace, because a new substance is formed. 
b)
Clothes are folded, because there is a color change. 
c)
A mirror is broken, because there is a change in shape/size.
d)
cookies are baked, because there is a change in temperature
17.
How many hydrogen atoms are in this chemical formula: 
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
18.

The atomic number of oxygen is

a)

8

b)

15.9994

c)

16

d)

O

19.

The number of electrons in a Lithium atom is

a)

3

b)

4

c)

6

d)

7

20.

Electrons are

a)

Positively charged particles

b)

Negatively charged particles

c)

Neutral

21.

If an atom has 3 electrons, how many protons does it have?

a)

1

b)

2

c)

3

d)

4

22.

What is made up two or more elements that are chemically combined?

a)

Atom

b)

Element

c)

Compound

d)

Mixture

23.

Metals are located on what size of the periodic table?

a)

left

b)

right

c)

the stairway

d)

the bottom

24.
Which pair of elements have the same number of valence electrons?
a)
Lithium and Beryllium
b)
Magnesium and Sodium
c)
Lithium and Sodium
d)
Magnesium and Lithium
25.
Which element would have similar properties to Sulfur?
a)
Nitrogen
b)
Oxygen
c)
Flourine
d)
Chlorine
26.
According to the Law of Conservation of Mass,
a)
matter is always created in a chemical reaction.
b)
matter is always destroyed in a chemical reaction.
c)
matter is created and then destroyed in a chemical reaction
d)
matter is not created or destroyed in a chemical reaction.
27.
How many oxygen products are listed in the chemical equation below,
2Mg + O2 ------> 2MgO
a)
0
b)
1
c)
2
d)
4
28.
_____________ are characteristics that help identify substances and tell them apart
a)
Properties
b)
Qualities
c)
Reactions
d)
Molecules
29.
A piece of gold has a mass of 40g and a volume of 2 cm3. What is its density?
a)
1/20 g/cm3
b)
80 g/cm3
c)
20 g/cm3
d)
40 g/cm3
30.
Bananas turning rotten: chemical change or physical change? 
a)
Chemical Change
b)
Physical Change
31.
Ionically bonded compounds are made of atoms that 
a)
share electrons
b)
shoot their electrons out into space
c)
move their electrons to the nucleus of the atom
d)
give electrons to and accept electrons from each other
32.
The compounds on the left side of a chemical equation are called the _____.
a)
Ingredients
b)
Reactants
c)
Total
d)
Products
33.
The compounds on the right side of a chemical equation are called the _____.
a)
Ingredients
b)
Reactants
c)
Total
d)
Products
34.

Which is a compound?

a)

Nitrogen (N2)

b)

Neon (Ne)

c)

Ozone (O3)

d)

Ammonia (NH3)

35.

How many atoms of oxygen are in a molecule of glucose, C6H12O6?

a)

1

b)

6

c)

12

d)

24

36.

Which of these is an element?

a)

KBr

b)

O2

c)

2KCl

d)

FeO2

37.

What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?

a)

very high melting point

b)

gas state at room temperature

c)

good conductor of electric current

d)

extremely brittle solid at room temperature

38.

Where are the most reactive metals located on the periodic table?

a)

the uppermost complete row of the table

b)

the rows at the bottom of the table connecting two sections

c)

the column at the far left side of the table

d)

the second column from the right side of the table

39.

Which task in the kitchen is an example of a physical change?

a)

frying an egg

b)

baking a cake

c)

melting butter

d)

toasting bread

40.
This is a molecules of methane. What types of elements are present and how many of each?
a)
Hydrogen (5)
b)
Hydrogen (4) and Carbon (1)
c)
Carbon (5)
d)
Hydrogen (1) and Carbon (4)
41.
What is a molecule?
a)
Two or more atoms bonded together
b)
Three or more atoms bonded together made of different elements
c)
It is the same thing an an atom
42.

An atom of gold with 79 protons, 79 electrons and 118 neutrons would have a mass number of .....

a)

39

b)

158

c)

197

d)

276

43.

On the Periodic Table, a horizontal row is called.....

a)

atomic mass

b)

a family

c)

a group

d)

a period

44.

Which of the following is true for valence electrons?

a)

Valence electrons are always located in the innermost energy level.

b)

Valence electrons may be lost or gained by an atom when bonding occurs with another atom.

c)

Each element in the periodic table has a different amount of valence electrons.

d)

Valence electrons are only found in radioactive isotopes.

45.

In the periodic notation above, what information does the 40.08 tell you?

a)

It is the number of protons.

b)

It is the number of neutrons.

c)

It is the atomic number.

d)

It is the atomic mass.

46.

An atom that has an electric charge is

a)

an element

b)

an isotope

c)

an ion

d)

a compound

47.

A vertical column on the periodic table is called...

a)

group

b)

tower

c)

period

d)

crew

48.

Why is water NOT on the periodic table?

a)

It is naturally occuring

b)

It is a compound, not an element

c)

It exists as a solid, a liquid, and a gas

d)

Its chemical formula doesn't fit

49.

Suppose a neutral atom were to lose an electron. What would happen to the atom?

a)

It would become negatively charged.

b)

It would become positively charged.

c)

It would remain neutral.

d)

It would also lose a proton.

50.
In ___ bonds, the electrons are being SHARED, usually between 2 non-metals.
a)
Ionic
b)
Compound
c)
Covalent
d)
Created
51.
Usually between metals and non-metals, ___ bonds attract due to positive and negative charges of the different elements involved.
a)
Ionic
b)
Compound
c)
Covalent
d)
Created
52.
What's the chemical formula for salt (Sodium Chloride)?
a)
H2O
b)
CO2
c)
NaCl
d)
O2
53.
What's the element name for K?
a)
Helium
b)
Potassium
c)
Magnesium
d)
Calcium
54.
What are the elements that run along the zig zag line called?
a)
Metalloids
b)
Metals
c)
Nonmetals
55.
What's the chemical formula for rust?
a)
CH3COOH
b)
Fe2O3
c)
N2O
d)
N2
56.
Volume is the amount of space an object takes up.
a)
True
b)
False
57.
The ability of a substance to be pounded into sheets.
a)
State
b)
Density
c)
Malleability 
58.
The atomic number of Sulfur is:
a)
32.06
b)
16
c)
32
59.

Sodium

a)

Na

b)

Hg

c)

Pb

d)

He

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