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Mole, Shapes, Formulas PRACTICE test

Total questions: 43

Worksheet time: 1hrs 17mins

Name
Class
Date
1.
*
a)
tetrahedral
b)
trigonal pyramid
c)
angular or bent
d)
trigonal plane
2.
Which of the following most likely represents the molecular geometry of water?
a)
A
b)
B
c)
C
d)
D
3.
SiCl4 has what shape?
a)
square planar
b)
square pyramidal
c)
tetrahedral
d)
octahedral
4.
How many lone pairs are in this molecule's structure?
a)
6
b)
2
c)
0
d)
4
5.
How many electrons are shared in a triple bond?
a)
6
b)
3
c)
6 pairs
d)
5
6.
What is the name of pairs of electrons that do not participate in bonding? 
a)
outer pair
b)
unvalenced pair
c)
lone pair
d)
inner pair
7.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal and 1 Metal
c)
2 Metals
d)
2 Noble Gases
8.

Which of the following simple molecular

substances does NOT obey octet rule?

a)

SF6

b)

PF3

c)

CH3Cl

d)

CO2

9.

Which of the following molecules does NOT have a linear shape?

a)

CS2

b)

HCN

c)

OF2

d)

BeF2

10.

In which of the following pairs, do the molecules have a similar shape?

a)

BeCl2 and Cl2O

b)

SCl2 and CO2

c)

BH3 and NH3

d)

BF3 and HCHO

11.
In covalent bonds, electrons are ___________.
a)

transferred

b)

gained

c)

lost

d)

shared

12.

How many atoms are present in a 13.5 gram sample of beryllium?

a)

1.5 particles

b)

9 particles

c)

4.03 x1023 particles

d)

9.02 x1023 particles

13.

A sample of silver contains 5.71 x 1022 atoms. How many moles of silver are present?

a)

3.43 x 1046 moles

b)

0.0529 moles

c)

0.0948 moles

d)

10.5 moles

14.

How many atoms are present in a 0.0254 mole sample of gold?

a)

0.25 atoms

b)

1.528 x 1022 atoms

c)

4.22 x 10-25 atoms

d)

5 atoms

15.

Which of the following shows the correct setup to determine the number of moles in a 12.0 gram sample of Cl2?

a)

12/35.5 mole

b)

12/71 mole

c)

12 moles

d)

12 x 35.5 moles

16.

What is the molar mass of calcium hydroxide, Ca(OH)2?

a)

74.1 g/mole

b)

57.1 g/mole

c)

58.1 g/mole

d)

57.1 u

17.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
18.

Determine the mass of 2.40 moles of C6H12

a)

201 g

b)

115 g

c)

230. g

d)

353 g

19.
Calculate the mass of iron in a sample of iron ore containing 2.61x1023 iron atoms.
a)
0.433g
b)
24.2g
c)
44g
d)
6.02g
20.

How many molecules are present in a 135 g sample of Teflon, which has a formula of C2F4?

a)

6.13 x 1023 molecules

b)

5.13 x 1023 molecules

c)

8.13 x 10 23 molecules

d)

9.13 x 1023 molecules

21.

What is the mass of 0.75 moles of (NH4)3PO4?

a)

0.0044 g

b)

91 g

c)

110 g

d)

74 g

22.

How many molecules are present in 135 g of Teflon C2F4

a)

6.13 x 1023 molecules

b)

5.13 x 1023 molecules

c)

8.13 x 10 23 molecules

d)

9.13 x 1023 molecules

23.

How many Carbons "C" are in C18H34O3

a)

18

b)

34

c)

3

d)

37

24.

Molecular Formula = C2F6

Choose the correct empirical formula.

a)

CF

b)

C2F6

c)

C3F

d)

CF3

25.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
26.

Empirical Formula = CF2

Molecular formula mass = 192 g/mol

Molecular Formula = ?

a)

C4F8

b)

C8F4

c)

C3F6

d)

C2F4

27.

Molecular Formula = Si2F6

Choose the correct empirical formula.

a)

SiF

b)

Si2F6

c)

SiF3

d)

Si4F12

28.

The empirical formula of a substance is CH2O. The molar mass is 180g/mol. What is the molecular formula?

a)

CH2O

b)

C3H6O3

c)

C6H12O6

d)

C12H6O12

29.

What is the empirical formula of K2SO4?

a)

K2SO4

b)

KSO2

c)

K2SO2

d)

KSO8

30.
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 
31.
An empirical formula:
a)
is a formula that calculates the coefficients of a compound in a balanced equation.
b)
is the simplest whole-number ratio of moles of elements in the compound.
32.

C4H6 What is the empirical formula?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

33.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams/mole
d)
liters
34.
How many steps are in a gram to molecule conversion?
a)
1
b)
2
c)
3
d)
4
35.

In the following lewis structure, how many atoms are bonded to the central atom?

a)

1

b)

2

c)

3

d)

4

36.

In the following lewis structure, how many lone pairs of electrons are around the central atom?

a)

0 lone pairs of electrons

b)

1 lone pair of electrons

c)

3 lone pairs of electrons

d)

4 lone pairs of electrons

37.

Which is the 3D picture of this molecule?

a)
b)
c)
d)
38.

In the following lewis structure, how many bonds are around the central atom?

a)

1 bond

b)

2 bonds

c)

3 bonds

d)

4 bonds

39.

In the following lewis structure, how many lone pairs of electrons are around the central atom?

a)

0 lone pairs of electrons

b)

1 lone pair of electrons

c)

2 lone pairs of electrons

d)

4 lone pairs of electrons

40.

This molecule has 2 bonds and 2 lone pairs around the central atom. What shape is it?

a)

bent

b)

trigonal pyramidal

c)

tetrahedral

d)

linear

41.
What is the best definition for subscript?
 
a)

The big number that tells you the number of molecules.

b)

The atomic number

c)

The little number that tells the number of atoms for each element.

42.

Molecular Formula = C2F6

Choose the correct empirical formula.

a)

CF

b)

C2F6

c)

C3F

d)

CF3

43.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6

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