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MX5 Review Grade 9

Total questions: 58

Worksheet time: 1hrs 22mins

Name
Class
Date
1.

Which of the following statements regarding the mole is incorrect?

a)

A mole is a counting unit equal to 6.02 x 1023 atoms.

b)

The number of atoms in a mole is known as Avogadro’s number.

c)

A mole of atom of an element is numerically equal to the atomic mass of the element.

d)

all other statements are true

2.

Acetone, C3H6O, is the main component of fingernail polish remover. What is the molar mass of acetone to the nearest hundredths place?

a)

29.018 g/mol

b)

34.058 g/mol

c)

58.1 g/mol

d)

58.08 g/mol

3.

What is the percent composition of hydrogen in water?

a)

89.8%

b)

11.2%

c)

66.7%

d)

33.3%

4.

How many grams of silicon would there be in a sample that contained 9.99 x 1022 atoms?

a)

1.69 g

b)

4.66 g

c)

1.66 g

d)

1.79 g

5.

What is the percent by mass of calcium in CaF2?

a)

24%

b)

49%

c)

51%

d)

65%

6.
How many atoms are ther in 1 mol of Ag?
a)
1.66 x 10-21 atoms
b)
6.022 x 1023 atoms
c)
6.22 x 1023 atoms
d)
1.2 x 1024 atoms
7.
What is the mass of 1 mole of silver?
a)
197.0 g
b)
0.0093 g
c)
107.9 g
d)
0.0051 g
8.
How many atoms are present in 35.8 grams of sodium?
a)
137.3 atoms
b)
517 atoms
c)
2.16 x 1021 atoms
d)
9.38 x 1023 atoms
9.

What is the percent by mass of magnesium in MgO?

a)

20%

b)

40%

c)

50%

d)

60%

10.

What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?

a)

24%

b)

49%

c)

49%

d)

65%

11.

Find the percent composition of Cu2S?

a)

%Cu= 67.987 %S= 32.013

b)

%Cu= 79.854 %S= 20.145

c)

%Cu= 35.946 %S= 64.054

12.

Which of the following is NOT needed to calculate percent composition?

a)

Mass of specific element

b)

Molar Mass

c)

Avogadro's Number

d)

Division

13.

What is the general formula for the computation of percentage composition of the given element?

a)

% mass of element = mass of element in the compound divided by mass of the compound times 100

b)

% mass of element = mass of element in the compound divided by mass of the compound

c)

% mass of element = mass of element in the compound divided by 100

d)

% mass of element = mass of element in the compound

14.
The molar mass of an element is equal to its...
a)
Atomic mass
b)
Atomic number
c)
Oxidation number
d)
Valence electrons
15.
The mass of one mole of substance is called...
a)
molecular mass
b)
mole constant
c)
molar mass
d)
atomic weight
16.
What is the molar mass of sodium?
a)
11
b)
23
c)
45.98
d)
3
17.
What is the mass of one mole of aluminum?
a)
27 g
b)
13 g
c)
54 g
d)
14 g
18.
What is the molar mass of table salt (NaCl)?
a)
116.886 g/mol
b)
35.453 g/mol
c)
22.990 g/mol
d)
58.443 g/mol
19.
What is the molar mass of NaOH?
a)
40 g/mol
b)
38.989 g/mol
c)
23.998 g/mol
d)
57.004 g/mol
20.
How many particles are in a mole?
a)
602
b)
602 million
c)
602 moles
d)
6.02 x 1023
21.
How many atoms of iodine are in a mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
22.
The number 6.02 x 1023 is called...
a)
Obama's number
b)
Bohr's number
c)
Trump's number
d)
Avogadro's number
23.
Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C6H12O6? 
a)
1 mole = 78.12 g
b)
1 mole = 22.4 L 
c)
1 mol = 6.02x 1023 particles 
d)
more than one
24.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams/mole
d)
liters
25.

Avogadro’s number is:

a)

6.02 x 1022

b)

6

c)

6.02 x 1023

d)

3.01 x 1023

26.
The number 6.02 x 1023 is called...
a)
Obama's number
b)
Bohr's number
c)
Trump's number
d)
Avogadro's number
27.

What is a mole in chemistry?

a)

A small furry creature that digs holes in the ground

b)

A growth on your aunt's face with hairs sticking out of it

c)

A concept used to count extremely small particles in chemistry

d)

A unit of measurement for weight

28.

Who first proposed the idea of the mole?

a)

Lorenzo Romano Amedeo Carlo Avogadro

b)

Albert Einstein

c)

Isaac Newton

d)

Marie Curie

29.

What is the purpose of using the mole in chemistry?

a)

To count extremely small particles

b)

To measure weight

c)

To buy groceries

d)

To study animals

30.

How do chemists use the mole?

a)

To count particles in a sample

b)

To measure temperature

c)

To calculate volume

d)

To buy groceries

31.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
32.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
33.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
34.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4 
b)
K8SO16
c)
K8S4O8 
d)
K8S4O16 
35.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
36.

Which of the following is considered an empirical formula?

a)

CH3COOH

b)

C6H12O6

c)

H2O

d)

Mg2Cl4

37.

What is the empirical formula of C4H6 ?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

38.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
39.

What is the empirical formula for C4H6?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

40.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula
41.

What is a dormant volcano?

a)

molten rock

b)

the center of a volcano

c)

will never erupt again

d)

a volcano that is sleeping, but could erupt agian

42.

What is magma?

a)

pieces of the Earth's crust

b)

molten rock inside of a volcano

c)

small rock

d)

plates that meet

43.

What is lava?

a)

Molten rocks inside a volcano

b)

Molten rock outside a volcano

c)

small rocks

d)

magma

44.
A dead volcano is called what?
a)
active
b)
dormant
c)
extinct
45.
What type of volcano is shown on the model above? 
a)
Composite Volcano
b)
Shield Volcano
c)
Cinder Cone Volcano
46.
What type of volcano is shown on the model above? 
a)
Shield Volcano
b)
Composite Volcano
c)
Cinder Cone Volcano
47.
What type of volcano is shown on the model above? 
a)
Cinder Cone Volcano
b)
Composite Volcano
c)
Shield Volcano
48.
Which of the following terms are used to describe a volcano that may erupt at any time? 
a)
Dormant volcano
b)
Active volcano
c)
Extinct volcano
d)
Shield volcano
49.

Magma becomes lava when it reaches a volcano's ______.

a)

Vent

b)

Crater

c)

Chamber

d)

Mantle

50.

In a volcano, magma collects in a packet called ________.

a)

Magma flow

b)

Magma chamber

c)

Magma pipe

d)

Hot spot

51.

An opening on the Earth's crust through which hot molten rock flows out from deep inside the Earth.

a)

Volcano

b)

Fault line

c)

Fold

d)

Crater

52.

Why does the volcanic eruption happen ?

a)

When the pressure on magma chamber inside earth increase and push magma to the surface.

b)

When it formes by eruption lava and ash.

c)

when rock underground suddenly breaks along a fault.

53.

A volcano is a mountain that has an opening to allow hot vapor, and gas to escape from the pool of magma below.

a)

True

b)

False

54.
What energy can be tapped from a volcano?
a)
hydrothermal energy
b)
solar energy
c)
geothermal energy
d)
nuclear energy
55.
What is the spread of lava as it pours out of a vent?
a)
magma chamber
b)
pipe
c)
lava flow
d)
crater
56.

What is a shield volcano?

a)

a volcano that will not erupt again

b)

cone shaped mountian

c)

dome shaped mountian

d)

magma

57.

Ashfall may cause respiratory problems, eye problems, and skin irritation.

a)

TRUE

b)

FALSE

58.

Volcanoes can be found...

a)

on land

b)

under water

c)

all of the above

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