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Review: Atoms Unit--8th

Total questions: 95

Worksheet time: 8hrs 55mins

Name
Class
Date
1.

___________is the basic unit from which all matter is made.

a)

Element

b)

Atoms

c)

Molecule

d)

Matter

2.

Anything that has mass and takes up space is called ____________.

a)

Atom

b)

Element

c)

Molecule

d)

Matter

3.

What is the basic building block of matter (made of protons, electrons, and neutrons)?

a)

Matter

b)

Molecule

c)

Atom

d)

Crystal

4.

What has no charge?

a)

Protons

b)

Neutrons

c)

Electrons

5.

What has a negative charge?

a)

Protons

b)

Neutrons

c)

Electrons

6.
Subatomic particles with a positive charge
a)
neutrons
b)
atomic mass
c)
protons
d)
isotopes
7.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

8.
Subatomic particles that are neutral in charge
a)
Neutrons
b)
Protons
c)
Nucleus 
d)
Electrons
9.
How many protons does an O2 atom have?
a)
8
b)
24
c)
16
d)
When is lunch? 
10.

Found orbiting outside the nucleus, this subatomic particle has a negative charge.

a)

Neutron

b)

Proton

c)

Electron

d)

Idontknowatron

11.

How many protons does indium have?

a)

49

b)

66

c)

114

d)

115

12.

What is the atomic mass of barium

a)

56

b)

82

c)

137

d)

138

13.

How many neutrons does platinum have?

a)

78

b)

117

c)

195

d)

196

14.
If an atom has 3 electrons, how many protons does it have?
a)
1
b)
2
c)
4
d)
3
15.
What is the mass number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
16.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
17.
Which is an electron?
a)
A
b)
B
c)
C
18.
What is found in the nucleus of atoms?
a)
Protons and electrons.
b)
Protons, neutrons, and electrons.
c)
Protons and neutrons.
d)
Neutrons and electrons.
19.
What are the 3 subatomic particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
20.
Each energy level of an atom has a maximum number of   ____ it can hold
a)
neutrons
b)
protons
c)
quarks
d)
electrons
21.
Horizontal rows of the periodic table are called   .
a)
groups
b)
families
c)
clusters
d)
periods
22.

This particle determines the identity of an atom.

a)

number of electrons

b)

number of neutrons

c)

number of protons

d)

sum of protons and neutrons

23.

Atoms in which the number of electrons is not the same as the number of protons.

a)

isomers

b)

ions

c)

isotopes

d)

isoelectronic

24.
How many neutrons will an atom have it has an atomic number of 26, an atomic mass of 58 and a charge of +3?
a)
26
b)
58
c)
32
d)
3
25.

How many protons will an atom have it has an atomic number of 26, an atomic mass of 56 and a charge of +3?

a)

29

b)

30

c)

26

d)

3

26.
How many electrons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?
a)
20
b)
45
c)
18
d)
2
27.

How many electrons are in an atom that has an atomic number of 34, a mass number of 74 and a charge of -2?

a)

34

b)

72

c)

36

d)

2

28.

Which describes a cation?

a)

positive ion, # electrons = # of protons

b)

positive ion, # electrons < # of protons

c)

negative ion, # electrons > # of protons

d)

negative ion, # electrons < # of protons

29.

How many valence electrons does carbon have?

a)

4

b)

5

c)

6

d)

7

30.
Elements in the same column of the periodic table always have the same # of _______ as one another.
a)
Protons
b)
Neutrons
c)
Electrons
d)
Valence Electrons
31.
How many valence electrons are found in atoms of group 14?
a)
4
b)
3
c)
14
d)
16
32.

This is a correct dot diagram for carbon (C)

a)

true

b)

false

33.

What are valence electrons?

a)

The total number of electrons in an atom

b)

The number of electrons in the outermost shell

c)

The number of electrons in the second shell

d)

The number of protons in the outermost shell

34.

All atoms are most stable with (or would "prefer") how many electrons in their valence shell?

a)

1

b)

2

c)

8

d)

18

35.

The period that an element is in, tells you what?

a)

Number of protons

b)

Number of electrons

c)

Number of valence electrons

d)

Number of shells

36.
Elements in the same column of the periodic table always have the same # of _______ as one another.
a)
Protons
b)
Neutrons
c)
Electrons
d)
Valence Electrons
37.

USE THE PERIODIC TABLE

Find the element that has 5 Valence Electrons and 4 energy levels (hint: row 4).

a)

Arsenic - As

b)

Selenium - Se

c)

Calcium - Ca

d)

Vanadium - V

38.

Which model represents the most reactive atom?

a)
b)
c)
d)
39.

What element, based on the subatomic particles in the atom, is shown?

a)

Beryllium

b)

Helium

c)

Lithium

d)

Oxygen

40.

Based on the information, what is the identity of this atom?

a)

Fluorine (F)

b)

Cobalt (Co)

c)

Germanium (Ge)

d)

Nickel (Ni)

41.

Which student's claim about valence electrons in a sulfur atom is correct?

a)

Student 1

b)

Student 2

c)

Both Student 1 and Student 2

d)

Neither Student 1 nor Student 2

42.

Which statement best explains why protons are used to identify an element?

a)

Protons are the most easily identified subatomic particles

b)

Positive charges are more easily detected during an investigation than negative and neutral charges

c)

The number of protons is unique to each element and remains constant

d)

Protons alone cannot be used to identify an element. The number of electrons and neutrons must also be known.

43.

A group of students examines a Bohr model of an atom with 8 valence electrons. What conclusion can the students make about the chemical reactivity of the element?

a)

The element is extremely reactive because the outer energy level is full

b)

The element is nonreactive because the outer energy level is full

c)

The element is somewhat reactive because the outer energy level is full

d)

Additional information is necessary to determine reactivity

44.

Which area would be most useful in determining the identity of an element?

a)

Area 1

b)

Area 2

c)

Area 3

d)

Area 4

45.

How many valence electrons does Na have?

a)

1

b)

5

c)

6

d)

11

46.

Select the elements that has 8 valence electrons.

a)

Ne

b)

Br

c)

Kr

d)

Xe

47.

What is the chemical symbol for Potassium?

a)

Po

b)

P

c)

K

d)

Pm

48.

All of the elements has 4 valence electrons EXCEPT______

a)

Carbon

b)

Silicon

c)

Germanium

d)

Selenium

49.

Which particles change the charge in atoms when ions are formed?

a)

Protons

b)

Electrons

c)

Neutrons

50.

Why are ions formed?

a)

To make our lives difficult

b)

Because atoms want to be stable

c)

Because atoms have the same number of protons and electrons

d)

Because atoms gained neutrons

51.

An atom becomes _________ when it gains electrons.

a)

Positive

b)

Negative

c)

Neutral

52.

An atom becomes _______ when it loses electrons.

a)

Positive

b)

Negative

c)

Neutral

53.

Anions are...

a)

Positive

b)

Negative

c)

Neutral

54.

Cations are...

a)

Positive

b)

Negative

c)

Neutral

55.

When an atom loses a valence electron, it becomes a(n) _____________ ion.

a)

positive

b)

negative

c)

neutral

56.

When an atom gains a valence electron, it becomes a(n) _____________ ion.

a)

positive

b)

negative

c)

neutral

57.
Where are metals located on the periodic table?
a)
Blue
b)
Green
c)
Red
58.
Where are the nonmetals located on the periodic table? 
a)
Blue
b)
Red
c)
Green
59.
What is the charge of an atom that has lost one electron?
a)
-1
b)
-2
c)
+1
d)
+2
60.
What is the charge of an atom that has gained one electron?
a)
-1
b)
-2
c)
+1
d)
+2
61.

A Bromine ion gains 1 electron, which of the following is the correct symbol for a Bromine ion?

a)

Br-1

b)

Br+1

c)

Br+7

d)

Br-7

62.

What is the ion formed from Sulfur?

a)

S+2

b)

S-2

c)

S+6

d)

S-6

63.
How many carbon atoms (C) are in a CO2 molecule?
a)
1
b)
2
c)
3
d)
0
64.
How many Oxygen atoms (O) are in a  molecule  of CO2
a)
1
b)
2
c)
3
d)
0
65.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
66.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
67.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
68.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
69.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
70.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
71.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
72.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
73.
In this image, the symbols to the right of the arrow (in black) are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
74.
Na + MgF2 -->  NaF + Mg
What are the reactants?
a)
Na + MgF2
b)
Na
c)
NaF + Mg
d)
NaF
75.
NH3 ---> N2 + H2
What are the products?
a)
N2 + H2
b)
N2
c)
H2
d)
NH3
76.

Which of the following accurately describes the chemical formula of the molecule shown above?

a)

3CH8O

b)

C3H7O

c)

C4H8O2

d)

C3H8O

77.

Which of the following molecules has the formula CH2O?

a)
b)
c)
d)
78.

How many atoms of hydrogen are in the formula CH3CH2Br?

a)

5

b)

3

c)

2

d)

7

79.

How many different elements are in the formula CH3CH2Br?

a)

3

b)

5

c)

6

d)

2

80.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
81.
In this image, what are the symbols in red are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
82.
The law of conservation of mass states that....
a)
Matter can be created
b)
Matter is sometimes destroyed
c)
Matter cannot be created or destroyed
d)
Matter can be created but not destroyed
83.

How many sodium (Na) atoms are in 6Na2Cl ?

a)

6

b)

12

c)

2

d)

1

84.

Which of the following represent chemical equations? Check all that apply.

a)

2Na + H2O → 2NaOH + H22Na\ +\ H_2O\ \rightarrow\ 2NaOH\ +\ H_2

b)

2KClO3 → 2KCl + 3O22KClO_3\ \ \rightarrow\ 2KCl\ +\ 3O_2

c)

2Fe + 3O2 → 2Fe2O32Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3

d)

2H2O2H_2O

e)

3O3 , H2O3O_3\ ,\ H_2O

85.

The formula shown here represents the breakdown of a metal into rust. What elements are involved in this reaction? Check all that apply. 4Fe + 3O2 → 2Fe2O34Fe\ +\ 3O_2\ \rightarrow\ 2Fe_2O_3  

a)

Iron

b)

Oxygen

c)

Carbon

d)

Nitrogen

86.

Which image below best demonstrates the Law of Conservation of Mass?

a)
b)
87.

Review the image and then pick the scenario below which best illustrates the Law of Conservation of Mass.

a)

A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 10g of Substance C.

b)

A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 15g of Substance C.

88.

Is this equation balanced?

a)

Yes

b)

No

89.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

90.
Why must we balance chemical equations? 
a)
Our teacher said so
b)
to abide by the law of conservation of energy
c)
to abide by the law of conservation of mass
91.

What does the symbol inside the circle mean?

a)

"yields, or produces"

b)

"dissolved in water"

c)

"forms a precipitate"

d)

"released as a gas"

92.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
93.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
94.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
95.
Balance this equation...
H2 + Cl2 --> HCl
a)
It is balanced 
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl

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