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Chemistry Final exam

Total questions: 63

Worksheet time: 1hrs 16mins

Name
Class
Date
1.
How are elements on the periodic table arranged by?
a)
in alphabetic order
b)
simular physical & chemical properties
c)
their symbols
d)
Just simular physical properties
2.
Each column in the periodic table is called a _________ .
a)
period
b)
group
c)
cluster
d)
unit
3.
Two elements chemically bonded form
a)
element
b)
compound
c)
mixture
d)
solutions
4.
Periods on the periodic table are __________.
a)
Horizontal Rows
b)
Vertical Columns
5.

The Atomic number is known as the _______

a)

Number of electrons in an atom

b)

Number of Protons in an atom

c)

Number of neutrons in an atom

d)

Number of Protons and electrons in an atom

6.

What charge do protons have?

a)

Positive

b)

Negative

c)

Neutral

7.

What is Atomic Mass Number ?

a)

Number of Protons

b)

Number of Neutrons

c)

Number of Protons and Neutrons

d)

Number of Protons and Electrons

8.

The number of electrons in an atom is equal to the...

a)

Atomic number

b)

Protons

c)

Atomic Mass

d)

Neutrons

9.

The formula used to calculate the number of neutrons is:

a)

Mass Number - Atomic Number

b)

Protons + Electrons

c)

Atomic Number - Mass Number

d)

Protons x2

10.

Elements in the same group have : (2 correct answers)

a)

Similar chemical properties

b)

Similar names

c)

Same number of outer (valence) electrons)

d)

The same number of protons

11.

Which of the following is the best description of an element?

a)

A substance that cannot be broken down into simpler substances.

b)

A naturally occurring mineral made of more than one substance.

c)

A small particle made with a specific chemical composition.

d)

A collection of atoms that have different abilities when joined together.

12.

Provided is a list of five different substances.

NaOH     Cu    H2O     N2    H2

How many of these substances are elements?

a)

2

b)

3

c)

4

d)

5

13.

How are elements and compounds different?

a)

A compound is represented by a chemical formula, and elements are represented by a chemical symbol.

b)

Compounds are represented by chemical symbols of one letter, and elements are represented by symbols of two letters.

c)

Elements are pure substances, and compounds are not.

d)

Elements are always larger units of matter, and compounds are smaller.

14.

How many elements are in the compound Fe2O3?

a)

0

b)

1

c)

2

d)

3

15.

Electrons are located where in the atom?

a)

Electron Cloud (Outside the Nucleus)

b)

Inside the Nucleus

c)

Electrons are not part of the atom

16.

Elements with different number of neutrons are called

a)

Isotopes

b)

Ions

c)

Neutrotopes

d)

Neurons

17.

What is the atomic number of the element shown?

a)

8

b)

15.99

c)

7.99

d)

23.99

18.

How protons does this element have?

a)

8

b)

16

c)

4

d)

24

19.

What is the atomic mass of this element?

a)

35

b)

80

c)

115

d)

45

20.

How many neutrons are in this element?

a)

35

b)

80

c)

115

d)

45

21.

What is a positively-charged ion which forms when an atom loses electrons?

a)

atom

b)

ion

c)

cation

d)

anion

22.

What is a negatively-charged ion which forms when an atom gains electrons?

a)

cation

b)

anion

c)

electron

d)

ion

23.
Write the correct chemical formula for Ag +  and  Br -
a)
AgBr
b)
silver bromide
c)
Ag2Br2
d)
gold bromide
24.
Write the correct formula for an ionic compound formed from S2- and Rb1+.
a)
SRb2
b)
SRb
c)
Rb2S
d)
RbS2
25.
What region of the periodic table contains atoms that form covalent bonds?
a)
the left side
b)
the middle
c)
the right side
d)
top left
26.
Which of the following is an example of an IONIC COMPOUND?
a)
NaCl
b)
H2O
c)
CO2
d)
NO
27.
Which of the following is an example of a COVALENT COMPOUND?
a)
H2S
b)
KI
c)
CaCl2
d)
MgO
28.
Name this compound: LiO
a)
lithium oxide
b)
oxygen monolithium
c)
monolithium dioxide
d)
dilithium dioxide
29.

What two types of atoms make a covalent bond?

a)

2 non-metals

b)

1 metal and 1 non-metal

c)

2 metals

30.
What atom matches this electron configuration?
1s22s22p63s2
a)
Neon
b)
Magnesium
c)
Aluminum
d)
Potassium
31.
What electron configuration matches an oxygen atom?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
32.
What is the correct formula for this molecule?
a)
Si4F
b)
SiF4
c)
SiF
d)
Si4F4
33.

NH3 has how many lone pairs?

a)

0

b)

1

c)

2

d)

3

34.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
35.
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
36.
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
37.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
38.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)

Combination/Synthesis

b)
Decomposition
c)

Single Displacement

d)

Double Displacement

39.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)

Combination/Synthesis

b)
Decomposition
c)

Single Displacement

d)

Double Displacement

40.
Two Reactants and One Product
a)
Decomposition
b)

Combination/Synthesis

c)
Combustion
d)

Single Displacement

41.

What 3-D shape would this molecule have?

a)

Trigonal planar

b)

Pyramidal

c)

Tetrahedral

d)

Bent

42.

Which Lewis Dot Model drawing correctly shows an O2 molecule?

a)
b)
c)
d)
43.
Which would have more atoms?
a)
1 mole of Li
b)
1 mole of Au
c)
1 mole of Si
d)
None, all are equal
44.
How many sig figs are there?
100.00
a)
1
b)
3
c)
4
d)
5
45.
How many sig figs are there?
4004
a)
1
b)
2
c)
3
d)
4
46.
How many sig figs are there?
0.000008
a)
1
b)
2
c)
6
d)
7
47.

The half-life of Uranium is 2.5 x 105 years. What is this in standard form?

a)

2500000

b)

250

c)

25000

d)

250000

48.

Write 4.83 x 10-6 in Standard Form.

a)

0.00048300

b)

0.00004830

c)

0.00000483

d)

0.00000438

49.
This solution would be considered
a)
Unsaturated
b)
Supersaturated
c)
Saturated
d)
Undefined
50.
Contains the maximum amount of dissolved solute
a)
unsaturated solution
b)
supersaturated solution
c)
saturated solution
51.
This graph represents a(n) ___ solution
a)
saturated
b)
supersaturated
c)
unsaturated
d)
undefined
52.

Calculate the molar mass of KOH.

a)

28 g/mol

b)

56 g/mol

c)

84 g/mol

d)

112 g/mol

53.

Calculate the molar mass of Cu2O.

a)

37 g/mol

b)

45 g/mol

c)

79.5 g/mol

d)

143 g/mol

54.

Calculate the molar mass for Al(OH)3

a)

78.0 g/mol

b)

72 g/mol

c)

28 g/mol

d)

25 g/mol

55.

In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen?

a)

10:6

b)

3:4

c)

4:3

d)

2:3

56.

N2 + 3H2 → 2NH3

What is the mole ratio between Nitrogen and Ammonia in the above reaction?

a)

1 moles NH3 / 2 moles N2

b)

2 moles NH3 / 1 moles N2

c)

2 moles N2 / 3 moles NH3

d)

1 moles N2 / 3 moles NH3

57.

Which container will have lower pressure?

a)

Left

b)

Right

58.

A sample of a gas in a cylinder is shown. If the temperature is kept constant and the piston moves down to decrease volume, the pressure increases because the gas particles...

a)

Expand

b)

Become smaller

c)

Lose velocity within the container

d)

Collide more often within the container

59.

The table shows the pH of several solutions. Which solution is the most acidic?

a)

vinegar

b)

milk

c)

water

d)

bleach

60.

H3PO4 is an example of a ...

a)

acid

b)

base

c)

salt

d)

non-electrolyte

61.

If a solution has a pH of 1.5, then litmus would turn

a)

red

b)

purple

c)

blue

d)

yellow

62.

Solutions that have more OH– ions than H+ ions are

a)

acids

b)

bases

c)

enzymes

d)

neutral

63.

Which of these pH values represent an water?

a)

7

b)

8

c)

10

d)

12

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