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8th Grade Unit 1 Review

Total questions: 69

Worksheet time: 1hrs 9mins

Name
Class
Date
1.

the basic structural unit of matter

a)

atom

b)

matter

c)

element

d)

nucleus

2.

a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means

a)

element

b)

subatomic particle

c)

electron

d)

matter

3.

the positively charged subatomic particle contained in the nucleus of an atom

a)

proton

b)

neutron

c)

electron

d)

matter

4.

a subatomic particle, contained in the nucleus of an atom, having the same mass as a proton but no electrical charge

a)

proton

b)

neutron

c)

electron

d)

matter

5.

a negatively charged subatomic particle that orbits the nucleus of an atom

a)

proton

b)

neutron

c)

electron

d)

matter

6.

an arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column and properties repeat from row to row

a)

Periodic Table of Elements

b)

Atomic Theory

c)

Isotopes

d)

Subatomic Particles

7.

one or two letters that represent the name of an element

a)

element name

b)

element symbol

c)

atomic number

d)

atomic mass

8.

a unique number for each element that equals the number of protons in an atom of that element

a)

element name

b)

element symbol

c)

atomic number

d)

atomic mass

9.

the mass of an atom, calculated by adding the number of protons and neutrons in the nucleus of the atom

a)

element name

b)

element symbol

c)

atomic number

d)

atomic mass

10.

a grouping of elements based on similar properties, arranged by columns in the periodic table; also known as a group

a)

family

b)

period

c)

row

d)

isotope

11.

a row on the Periodic Table of Elements

a)

family

b)

period

c)

row

d)

isotope

12.

an atom or group of atoms that has gained or lost one or more electrons and is now either positively or negatively charged

a)

isotope

b)

ion

c)

orbital

d)

nucleus

13.
How many different elements are in this chemical formula: C2H2ClK3
a)
6
b)
8
c)
2
d)
4
14.
Which of the following atomic symbols for bromine is written correctly?
a)
bR
b)
BR
c)
Br
d)
br
15.
Which of the following chemical formulas represents a compound? 
a)
C3
b)
O2
c)
CH3CHO
d)
H2
16.
What is water?
a)
element
b)
compound
c)
mixture
17.
When two or more elements chemically combine
a)
element
b)
compound
c)
mixture
d)
solution
18.
The Modern Periodic Table of Elements is arranged by
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
19.
Sodium (Na) is found in period 
a)
3
b)
2
c)
4
d)
1
20.
Sodium (Na) is found in group 
a)
1
b)
2
c)
3
d)
4
21.
What does the atomic mass tell you? 
a)
Basically,the number of electrons and protons
b)
The number of neutrons
c)
Basically, the number of protons and neutrons
d)
The number of protons.
22.
The atomic number tells you what?  READ THE ANSWERS CAREFULLY
a)
only the number of electrons
b)
 only the number of protons
c)
only the number of neutrons
d)
the number of both electrons and protons in an atom.
23.
What does the 6 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
24.
What does 12.011 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
25.
What does the C represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
26.
These are found on the Periodic Table.
a)
Compounds
b)
Elements
c)
Mixtures
27.
What is the name of this element?
a)
Helium
b)
Rubidium
c)
Hydrogen
d)
Mercury
28.
What is the atomic number of Oxygen?
a)
6
b)
7
c)
8
d)
9
29.
What is the name of this element?
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon
30.
What is the atomic number of this atom?
a)
2
b)
4
c)
6
d)
none of the above
31.
How many valence electrons?
a)
2
b)
3
c)
5
d)
10
32.

What is 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

33.

The innermost energy level has a maximum of how many electrons?

a)

1

b)

2

c)

6

d)

8

34.

What is this element?

a)

Beryllium (atomic #4)

b)

Boron (atomic #5)

c)

Carbon (atomic #6)

d)

Nitrogen (atomic #7)

35.

How many valence electrons?

a)

2

b)

3

c)

4

d)

5

36.

Which Bohr model represents Neon?

a)
b)
c)
d)
37.
How are electrons arranged in an atom?
a)
In groups of five
b)
In energy levels
c)
By color
d)
By shape
38.
How many electrons does potassium K contain? (click to see image)
a)
19
b)
39
c)
20
d)
40
39.

Which of the following is true about an ATOM?

a)

the number of PROTONS and the number of NEUTRONS are equal

b)

the number of PROTONS and the ATOMIC MASS are equal

c)

the number of PROTONS and the number of ELECTRONS are equal

d)

the number of protons, neutrons, and electrons are ALWAYS equal

40.

What is the ATOMIC NUMBER of Nitrogen?

a)

14

b)

7

c)

21

d)

15

41.

What is the ATOMIC MASS of Nitrogen rounded to the NEAREST WHOLE NUMBER?

a)

14

b)

21

c)

7

d)

15

42.

How many NEUTRONS does an atom of Nitrogen have? (Remember A=P=E M-A=N)

a)

21

b)

7

c)

14

d)

15

43.

How many PROTONS does an Atom of Nitrogen have? (Remember A=P=E M-A=N)

a)

14

b)

7

c)

15

d)

21

44.

How many ELECTRONS does an Atom of Nitrogen have? (Remember A=P=E M-A=N)

a)

21

b)

15

c)

7

d)

14

45.

How many VALENCE ELECTRONS does this Element have?

a)

2

b)

8

c)

10

d)

12

46.

The element Lithium has 3 protons, 3 electrons, and a mass number of 7. How many NEUTRONS are in this atom? (Remember: A=P=E M-A=N)

a)

3

b)

7

c)

4

d)

10

47.

In a Bohr Model, how many Electrons can the FIRST ENERGY LEVEL hold?

a)

2

b)

8

c)

1

d)

10

48.
How many elements are represented in the compound?
Na2CO3
a)
1
b)
2
c)
3
d)
4
49.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
50.
Water (H2O) freezing is an example of:
a)
A chemical change
b)
A physical change
51.
A chemical change always results in the formation of a:
a)
explosion
b)
big mess
c)
new substance
d)
new state of matter
52.
Is salt (NaCI) a compound or a element
a)
Compound
b)
element
53.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
54.
The smell your dog makes after eating to much people food.
a)
Chemical Change
b)
Physical Change
55.

You know that a chemical reaction has occurred if

a)

there is a precipitate (new solid)

b)

there is a color change.

c)

there is a temperature change.

d)

All of these answers are evidence.

56.

In chemical reactions, what does the Law of Conservation of Matter mean?

a)

Matter is 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.

57.
What is the difference between a natural and synthetic material?
a)
Natural material is made from chemicals and synthetic is made from nature
b)
Natural material is made directly from nature and synthetic material is made from chemicals
c)
Natural material is made from petroleum and synthetic material is made from wool
d)
Natural material is made from trees and synthetic materials are made from plastics
58.

What is a synthetic material?

a)

Any material that is man made

b)

Any material that is only made from natural resources

c)

Any material that is made of recycled materials

d)

Any material that is found in nature.

59.

A _____________________ is a natural resource that we can replace faster than we use it up.

a)

renewable resource

b)

nonrenewable resource

c)

synthetic material

d)

man made product

60.
What word means "manufactured in a lab or chemical plant"?
a)
macromolecular
b)
alloy
c)
synthetic
d)
ceramic
61.

Read the following statements. Select each answer choice that is a true statement about synthetic materials. Please select 4 answers.

a)

Synthetic materials are made from natural resources

b)

Synthetic materials are made by chemically changing natural resouces to create a material with different characteristics.

c)

Some examples of synthetic materials are plastics, medicines, and new fuels.

d)

A synthetic substance cannot be chemically identical to a naturally-occurring substance

e)

Making and using synthetic materials have both positive and negative impacts on society.

62.

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

63.

An atom with 3 valence electrons "wants" a full shell, so it can either gain 5 or lose 3. Which is more likely to occur?

a)

Gain 5

b)

Lose 3

c)

Nothing

64.

How many Aluminum atoms are in Al2O3?

a)

3

b)

5

c)

2

d)

1

65.

How do covalent bonds form?

a)

By donating and receiving valence electrons between atoms.

b)

Scientists still aren't sure.

c)

Opposite slight charges attract each atom in the compound.

d)

Sharing valence electrons between atoms

66.

When an atom loses an electron, it becomes a

a)

positive ion

b)

negative ion

c)

neutral ion

d)

neutral atom

67.
How are ionic bonds formed?
a)
Transfer of electrons
b)
Sharing of electrons
68.
Why do elements bond?
a)
To be friends
b)
To create a new element
c)
To become stable
69.
Atoms that gain electrons become...
a)
negatively charged
b)
positively charged
c)
remain neutrally charged
d)
21

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