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Chemistry Unit 3 Practice Test

Total questions: 46

Worksheet time: 4hrs 37mins

Name
Class
Date
1.
Which model is this?
a)
Planetary
b)
Plum Pudding
c)
Nuclear
d)
Quantum Mechanical
2.

Which model is this?

a)

Planetary

b)

Plum Pudding

c)

Nuclear

d)

Quantum Mechanical

3.
Which model is this?
a)
Planetary
b)
Plum Pudding
c)
Nuclear
d)
solid sphere
4.
Which model is this?
a)
Planetary
b)
Plum Pudding
c)
Nuclear
d)
Quantum Mechanical
5.
What is Democritus known for?
a)
atomos
b)
combining and separating atoms
c)
saying the atom is empty space
d)
saying electrons orbit on specific paths
6.
What is Bohr known for?
a)
atomos
b)
combining and separating atoms
c)
saying the atom is empty space
d)
saying electrons orbit on specific paths
7.

Who discovered the electron?

a)

James Chadwick

b)

Rutherford

c)

JJ Thompson

d)

Marie Lavoisier

8.
Who is considered to be the Father of Modern Chemistry?
a)
Dalton
b)
Democritus
c)
Lavoisier
d)
Chadwick
9.

What is the atomic mass of Neon?

a)

10

b)

20.18

c)

10.18

d)

20

10.
How many protons are in Beryllium?
a)
4
b)
9
c)
5
d)
2
11.
How many neutrons are in a Gold atom?
a)
79
b)
196
c)
118
d)
275
12.

How many neutrons does a Hydrogen atom have?

a)

1

b)

2

c)

3

d)

0

13.

Where is the proton found in an atom?

a)

nucleus

b)

orbiting around the nucleus

c)

protons don't exist o_O

d)

Justmir is hiding it.

14.
What is this number representing?
a)
Number of protons
b)
Number of Protons and Electrons
c)
Number of Protons and Neutrons
d)
Number of Electrons, Protons and Neutrons
15.
What does this number represent?
a)
Number of protons
b)
Number of neutrons
c)
Number of electrons
d)
Number of protons and neutrons
16.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
17.
A neutral atom of Carbon-13 has ________ electrons and _________ neutrons
a)
13, 13
b)
6, 7
c)
7, 7
d)
6, 6
18.
Oxygen has 8 protons. What is oxygen's atomic number?
a)
16
b)
8
c)
15.999
d)
0
19.
Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses. 
a)
protons, neutrons
b)
protons, electrons
c)
neutrons, protons
d)
electrons, protons
20.
The nucleus is ____________ charged whereas the electron cloud is ____________ charged. 
a)
negatively, positively
b)
negatively, negatively
c)
positively, positively
d)
positively, negatively
21.
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
a)
41.97 amu
b)
42.19 amu
c)
10.43 amu
d)
40.04 amu
22.

Emission of light from an atom occurs when an electron

a)

drops from a higher to a lower energy level.

b)

jumps from a lower to a higher energy level.

c)

moves within its atomic orbital.

d)

falls into the nucleus.

23.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
24.
Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?
a)
0.25g
b)
2.5g
c)
25g
d)
80g
25.
The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?
a)
3.0g
b)
0.25mg
c)
0.3g
d)
0.25g
26.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
27.
If one-fourth of the carbon-14 is remaining then how many half-lives have passed?
a)
1
b)
2
c)
3
d)
4
28.
After the third half-life, how much of the sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
29.
If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?
a)
1 half-life
b)
2 half-lives
c)
3 half-lives
d)
4 half-lives
30.
An isotope is an atom of an element with a different number of
a)
protons
b)
electrons
c)
neutrons
d)
pencils
31.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
32.

Which subatomic particle has a negative charge?

a)

proton

b)

neutron

c)

electron

d)

cybertron

33.
Discovered the nucleus of the atom through the Gold Foil Experiment
a)
Rutherford
b)
Chadwick
c)
Thomson
d)
Dalton
34.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

35.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
36.

What is the atomic number of Barium, Ba? (enlarge the periodic table)

a)

20

b)

38

c)

56

d)

88

37.

An element has the mass number 12 and atomic number 6. The number of neutrons in it is:

a)

6

b)

10

c)

4

d)

8

38.

The diagram shows 32 atoms.

16 of the Red are parent isotopes

16 of the Green are daughter isotopes

How many half-lives have occurred?

a)

0

b)

1

c)

2

d)

3

39.
What did De Broglie work on?
a)
quantum theory
b)
nuclear chemistry
c)
uncertainty principle
d)
wave theory
40.
What is the currently accepted model of the atom?
a)
Solid sphere
b)
Nuclear
c)
Planetary
d)
Quantum Mechanical
41.
Who discovered the idea of charge and when ?
a)
Millikan in 1909
b)
Rutherford in 1909
c)
JJ Thompson in 1897
d)
Marie Lavoisier in 1970
42.
Discovered elements changed as their protons increased. He rearranged the elements based on atomic number which fixed problems in the periodic table. 
a)
Johann Dobereiner
b)
John Newlands
c)
Dmitri Mendeleev
d)
Henry Moseley
43.

Discovered the electron using cathode ray tube

a)

JJ Thomson

b)

John Dalton

c)

Ernest Rutherford

d)

Robert Millikan

44.
Why are line emission spectra of elements called "atomic fingerprints"?
a)
They are all the same
b)
They are all unique
c)
They are all similar
d)
They all contain colored light
45.

An atom that has gained energy beyond normal is said to be ...

a)

excited

b)

grounded

c)

naturalized

46.

In order to go from ground state to an excited state, an electron must

a)

emit energy

b)

absorb energy

c)

rotate

d)

wiggle

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