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Science 10 Chemistry Unit Exam

Total questions: 80

Worksheet time: 20hrs 0mins

Name
Class
Date
1.

When metal atoms form ions, they tend to

a)

gain electrons and form positive ions

b)

lose electrons and form positive ions

c)

gain electrons and form negative ions

d)

lose electrons and form negative ions

2.

What does this diagram represent?

a)

a nickel ion

b)

a silicon atom

c)

a nickel atom

d)

A. an oxygen ion

3.

Which number represents an element in the halogen family?

a)

1

b)

2

c)

3

d)

4

e)

5

4.

Which number represents an element that can be classified as a metalloid?

a)

1

b)

2

c)

3

d)

4

e)

5

5.

An experiment shows that an unknown element does not easily lose or gain electrons. Which unknown represents this element?

a)

1

b)

2

c)

3

d)

4

e)

5

6.

Which number corresponds to a metal that belongs to the most reactive group of metals on the periodic table?

a)

1

b)

2

c)

3

d)

4

e)

5

7.

Potassium hydroxide and barium chloride react to produce barium hydroxide and potassium chloride. The balanced equation for this reaction is

a)

KOH + BaCl2 ——> BaOH + KCl

b)

K(OH)2 + 2 BaCl ——> 2 BaOH + KCl2

c)

KOH + BaCl ——> BaOH2 + KCl

d)

2 KOH + BaCl2 ——> Ba(OH)2 + 2 KCl

8.

How many occupied energy levels are there in a calcium atom?

a)

1

b)

2

c)

3

d)

4

9.
An atom has an atomic number of 19 and a mass number of 29. How many neutrons are in the atom?
a)
30
b)
19
c)
10
d)
38
10.
An atom has 5 protons and 7 neutrons. What is the mass number of the atom?
a)
5
b)
7
c)
2
d)
12
11.
Which of the following is a positively charged subatomic particle found in the nucleus of an atom?
a)
Electron
b)
Proton
c)
Neutron
d)
Quark
12.
What is in the nucleus of an atom?
a)
Neutrons and protons 
b)
Protons
c)
Protons and Electrons
d)
Electrons and Nuetrons
13.
An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?
a)
15
b)
31
c)
16
d)
47
14.
What are the horizontal rows on the periodic table called?
a)
Groups
b)
Periods
c)
Rows
d)
Classifications
15.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
16.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
17.
All the elements on the right side of the periodic table are called..
a)
Metals
b)
Metalloid
c)
Nonmetals
18.

How many electrons should nitrogen have around its Lewis dot diagram?

a)

1

b)

3

c)

4

d)

5

19.

How many electrons should beryllium have around its Lewis dot diagram?

a)

1

b)

2

c)

3

d)

4

20.
Which of these is a property of metals?
a)
It's malleable
b)
It can't conduct electricity
c)
They are used in food
d)
It's very brittle
21.
When an atom loses an electron, it becomes a:
a)
positive ion
b)
negative ion
c)
neutral ion
d)
neutral atom
22.
What elements generally make an ionic bond?
a)
metal and nonmetal
b)
2 nonmetals
c)
metal
d)
none of the above
23.
What is a cation?
a)
positive ion
b)
Neutral atom
c)
Two additional protons
d)
negative ion
24.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
25.
Who could this molecule be?
a)
CH4
b)
CO2
c)
PCl5
d)
BF3
26.
If Magnesium (Mg+2) and Fluorine (F-1)  form an ionic bond, what is the chemical formula for that compound?
a)
Mg2F
b)
MgF2
c)
F2Mg3
27.
What is the chemical formula for carbon tetrachloride?
a)
CCl
b)
C4Cl
c)
CCl4
28.
What is the name of PF3?
a)
Monophosphorous trifluoride
b)
Phosphorous fluoride
c)
Phosphorous trifluoride
d)
Monophosphorous fluoride
29.
Na2CO3 · 10H2O is known as sodium sulfate ______
a)
Hydroxide
b)
Hydrate
c)
Decahydrate
d)
None of the above
30.

Which of the following is an example of synthesis or formation reaction?

a)

Na + Br2 --> NaBr

b)

KClO3 --> KCl + O2

c)

HgO + Cl2-->HgCl + O2

d)

Cl2 + NaBr --> NaCl + Br2

31.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
32.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
33.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
34.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
35.

How many electrons should argon have around its Lewis dot model?

a)

6

b)

8

c)

7

d)

4

36.

What is the formula for phosphorous acid?

a)

H3PO4 (aq)

b)

H2PO4 (aq)

c)

H3P (aq)

d)

H3PO3 (aq)

37.

What is the formula for hydrosulfuric acid?

a)

H2(SO3) (aq)

b)

H2S (aq)

c)

H2(SO2) (aq)

d)

H2(SO4) (aq)

38.

What is the formula for nitric acid?

a)

HNO2 (aq)

b)

HNO3 (aq)

c)

HNO4 (aq)

d)

H2NO3 (aq)

39.

The correct name for this acid H2SO3 (aq) is

a)

Hydrosulfiric acid

b)

Sulfurous acid

c)

Sulfiric acid

d)

Sulfate acid

40.
What is the NAME of....
Na2S
a)
sodium (II) sulfide
b)
sodium sulfide
c)
disodium sulfide
d)
sodium sulfur
41.
What is the FORMULA for....
beryllium iodide
a)
Be2I
b)
BeI
c)
BeI2
d)
BI2
42.
The name of the compound NH4F is
a)
Nitrogen hydrogen fluorine
b)
Ammonium Fluoride
c)
Ammonia Fluoride
d)
Nitrogen tetrahydride fluoride
43.
The name of Al₂(SO₄)₃ is
a)
aluminum sulfur oxide
b)
aluminum sulfate
c)
aluminum trisulfate
d)
aluminum (III) sulfate
44.
The name of Fe(OH)₂ is
a)
iron oxide
b)
iron hydroxide
c)
iron (II) hydroxide
d)
iron dihydroxide
45.
The chemical formula of sodium sulfate is
a)
S₂SO₄
b)
NaSO₂
c)
NaSO₄
d)
Na₂SO₄
46.
What is the formula for tin (II) nitride?
a)
Sn3N2
b)
SnN2
c)
Sn3N
d)
SnN
47.
Fe+3 combines with S-2 to form 
a)
Fe+4(S)=3
b)
Fe2S4
c)
Fe2S3
d)
Fe3S2
48.
What is the correct name for C4H6?
a)
Carbon Hexahydride
b)
Pentacarbon Pentahydride
c)
Hexacarbon Tetrahydride
d)
Tetracarbon Hexahydride
49.
What is the correct name for NO?
a)
Mononitrogen Monoxide
b)
Nitrogen Monoxide
c)
Mononitrogen Dioxide
d)
Nitrogen Oxide
50.

What is the formula for tricarbon octahydride?

a)

Ca3O

b)

C2H8

c)

C3H8

d)

Ca3H8

51.

The formula for disulfur trioxide is

a)

S3O2

b)

SO

c)

S2O3

d)

S2O

52.

The correct name for H2SO4 (aq) is

a)

sulfurous acid

b)

hydrosulfurous acid

c)

hydrosulfuric acid

d)

sulfuric acid

53.

The formula for aluminum acetate is

a)

Al(Ac)3

b)

Al(C2H3O2)3

c)

AlC2H3O2

d)

Al3C2H3O2

54.

The formula for barium hydroxide is

a)

BaOH

b)

Ba(OH)2

c)

BaO

d)

BaH2

55.

Is CrN2 the correct formula for chromium(II) nitride? If not, what should the formula be?

a)

It is correct

b)

Is not. It should be Cr2N

c)

Is not. It should be Cr3N2

d)

Is not. It should be CrN2

56.

What is the correct formula for lithium cyanide?

a)

Li4C

b)

LiCN

c)

Li3N

d)

CnLi

57.

What is the name of Al2O3?

a)

aluminum (II) oxide

b)

aluminum hydroxide

c)

aluminum oxide

d)

aluminum (III) oxide

58.
___C3H8 +___O2 --> ___CO2 + ___H2O
a)
1,5,3,4
b)
2,10,6,8
c)
already balanced
d)
1,5,5,4
59.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
60.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
61.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2
62.
__BF3 + __Li2SO3 --> __B2(SO3)3 + __LiF
a)
2,3,1,3
b)
2,3,1,6
c)
4,4,2,12
d)
3,3,1,9
63.

What type of reaction if this? Cl2 + 2KI --> I2 + 2KCl

a)

Synthesis

b)

Single Replacement

c)

Double Replacement

d)

Decomposition

64.

What type of reaction is this?

3KOH + H3PO4 --> K3PO4 + 3H2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

65.
What type of reaction is this?
C3H6O + 4 O2 -->3 CO2 + 3 H2O 
a)
single replacement
b)
synthesis
c)
combustion
d)
decombustion
66.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
67.

The solid that forms from a double replacement reaction is called a ________.

a)

solid.

b)

aqueous solution.

c)

precipitate.

d)

solute.

68.

The product of a complete combustion reaction is always:

a)

Carbon Dioxide gas and liquid water

b)

Carbon Dioxide gas

c)

Water vapor

d)

Carbon Dioxide Gas and water vapor

69.

What is the mass of one mole of silver?

a)

32.06 g

b)

107.87 g

c)

14.01 g

d)

22.99 g

70.

48.86 g of cobalt is equal to how many moles of cobalt?

a)

2879 moles

b)

8.291 moles

c)

.8291 moles

d)

.829 moles

71.

How many moles of sodium chloride are in a 321.8 g sample?

a)

18810 moles

b)

3.315 x 1024 moles

c)

5.507 moles

d)

4.767 moles

72.

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

a)

0.0044 g

b)

91 g

c)

110 g

d)

74 g

73.

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

74.

What element is represented in this Bohr Model?

a)

Carbon

b)

Hydrogen

c)

Aluminum

d)

Lithium

75.
What is the mass number of this atom?
a)
1
b)
3
c)
4
d)
7
76.
What is the atomic number of this atom?
a)
2
b)
4
c)
6
d)
none of the above
77.
Identify this atom.
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon
78.

How many valence electrons?

a)

2

b)

3

c)

4

d)

5

79.
An element with five valence electrons is
a)
phosphorus
b)
oxygen
c)
beryllium
d)
rubidium
80.
How many electrons should Magnesium have around its Lewis dot model?
a)
1
b)
2
c)
3
d)
4

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