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Chemistry Module 1

Total questions: 36

Worksheet time: 27mins

Name
Class
Date
1.

Which of the following is true about subatomic particles?

a)

The mass of a neutron is much lighter than the mass of a proton.

b)

Electrons are negatively charged and are the lightest subatomic particle.

c)

Protons are positively charged and the lightest subatomic particle.

d)

Neutrons have no charge and are the lightest subatomic particle.

2.

The smallest particle of an element that retains the properties of that element is a(n) ____.

a)

electron

b)

atom

c)

proton

d)

neutron

3.

The atomic mass of an element is the ____.

a)

total mass of the isotopes of the element

b)

total number of subatomic particles in its nucleus

c)

weighted average of the masses of the isotopes of the element

d)

average of the mass number and the atomic number for the element

4.

The particles that are found in the nucleus of an atom are ____.

a)

electrons only

b)

neutrons and electrons

c)

protons and electrons

d)

protons and neutrons

5.

An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are __.

a)

76 protons and 76 electrons

b)

38 protons and 38 electrons

c)

76 protons and 0 electrons

d)

152 protons and 76 electrons

6.

The atomic number of an element is the total number of which particles in the nucleus?

a)

electrons

b)

neutrons

c)

protons

d)

protons and electrons

7.

All atoms of the same element have the same ____.

a)

mass numbers

b)

number of protons

c)

mass

d)

number of neutrons

8.

The sum of the protons and neutrons in an atom equals the ____.

a)

nucleus number

b)

atomic number

c)

atomic mass

d)

mass number

9.

What does the number 84 in the name krypton-84 represent?

a)

the mass number

b)

the sum of the protons and electrons

c)

twice the number of protons

d)

the atomic number

10.

How do the isotopes hydrogen-1 and hydrogen-2 differ?

a)

Hydrogen-2 has two protons; hydrogen-1 has one.

b)

Hydrogen-2 has one neutron; hydrogen-1 has none.

c)

Hydrogen-2 has one more electron than hydrogen-1.

d)

Hydrogen-2 has one proton; hydrogen-1 has none.

11.

Which scientist discovered the electrons?

a)

Dalton

b)

Thomson

c)

Atristotle

d)

Bohr

12.

Rutherford and his students did experiments that showed

a)

quark

b)

nucleus

c)

proton

d)

electron

13.

Which scientist discovered that the nucleus contained neutrons?

a)

bohr

b)

Rutherford

c)

Dalton

d)

Chadwick

14.
Which model of the atom proposed that atoms were positive spheres with negative electrons in them?
a)
Heliocentric Model
b)
Solid Sphere Model
c)
Plum Pudding Model
d)
Planetary Model
15.
This picture represents: 
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
16.
What type of mixture is this?
a)
homogenous mixture
b)
chemical
c)
heterogeneous mixture 
d)
solid mix
17.
A substance with two or more elements that are combined in a fixed proportion
a)
colloid
b)
compound
c)
element
d)
solution
18.
A substance in which all the atoms are the same
a)
colloid
b)
homogeneous mixture
c)
solution
d)
element
19.
A mixture in which different materials can be identified easily
a)
element
b)
heterogeneous mixture
c)
homogeneous mixture
d)
solution
20.
Which of the following is an element?
a)
Sugar
b)
Salt
c)
Water
d)
Oxygen
21.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
22.
Italian Salad Dressing is a . . .
a)
heterogeneous mixture
b)
homogeneous mixture
c)
Pure Substance
d)
Compound
23.

The state of matter in which the molecules/atoms are FURTHEST apart

a)

solid

b)

liquid

c)

gas

24.

The state of matter in which the molecules are CLOSEST together

a)

solid

b)

liquid

c)

gas

25.

This state of matter has no definite shape

a)

gas

b)

solid

c)

liquid

d)

both gas and liquid

26.

When a solid gains energy and becomes a liquid it is called

a)

freezing

b)

melting

c)

vaporization

27.

When a gas molecules lose energy and become a liquid it is known as

a)

vaporization

b)

condensation

c)

melting

d)

freezing

28.
Which line segment demonstrates vaporization occurring?
a)
B-C
b)
C-D
c)
D-E
d)
E-F
29.
As substance goes from D to E what happens to the distance between the particles?
a)
particles get closer together
b)
particles disappear
c)
particles get far apart
30.
At what temperature is this substance melting?
a)
50C
b)
100C
c)
0C
31.
How long does it take this substance to change from a liquid to a gas?
a)
1 minute
b)
2 minutes
c)
10 minutes
d)
15 minutes
32.

Which equation correctly represents the alpha decay of polonium-214?

a)

A

b)

B

c)

C

d)

D

33.

This equation shows the radioactive decay of thorium (Th). Which of the following particles is released in this reaction?

a)

alpha

b)

beta

c)

neutron

d)

gamma

34.
What particle completes this reaction?
a)
alpha particle
b)
beta particle
c)
gamma particle
d)
neutron
35.
If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.
a)
1.25mg
b)
1.25g
c)
10g
d)
10mg
36.

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

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