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Chemistry Mid-term

Total questions: 100

Worksheet time: 2hrs 48mins

Name
Class
Date
1.

Choose the correct order to show how a convection current works in an atmospheric system.

a)

Low density gas is pushed up-->Particles move faster-->Particles move apart-->Low density gas is pushed up-->The air is heated

b)

Particles move faster-->Particles move apart-->The air is heated-->Low density gas is pushed up

c)

The air is heated-->Particles move faster-->Low density gas is pushed up-->Particles move apart

d)

The air is heated-->Particles move faster-->Particles move apart-->Low density gas is pushed up

2.

Warm air rises because...

a)

it has higher kinetic energy which allows it to overcome gravity

b)

it is forced upward by the surrounding cool, dense air

c)

it reacts with turbidity flow to create an inversion

d)

it's molecules are spread apart so they push each other upward

3.

Density in solids and liquids is measured in...

a)

grams per liter

b)

grams per milliliter

c)

kilograms per milliliter

d)

kilograms per liter

4.

Density in gasses is measured in...

a)

grams per liter

b)

grams per milliliter

c)

kilograms per milliliter

d)

kilograms per liter

5.

Which list has only physical properties, no chemical properties?

a)

Color

Hardness

Toxicity

b)

Reactivity

Flammability

Hardness

c)

Freezing/Melting/Boiling Points

Flammability

d)

Malleability Conductivity

Density

6.

If L = 4 cm, W = 2 cm, and H = 2 cm, what is the volume of this object? (V = L W h)

a)

4 ml

b)

8 ml

c)

16 ml

d)

32 ml

7.

If the volume of this object is 10 ml, and the mass is 28 grams, what is the density?

a)

2.8 g/ml

b)

28 g/ml

c)

0.35 g/ml

d)

3.5 g/ml

8.

If r = 3 cm, and h = 3.5 cm, what is the volume of this object? (V = π r2 h)

a)

10.5 ml

b)

21 ml

c)

63 ml

d)

99 ml

9.
What happens when my glass of water is sitting in the sun and disappears into a gas?
a)
evaporation
b)
burning
c)
melting
d)
freezing
10.
Which form of matter does not take the shape of its container?
a)
liquid
b)
gas
c)
solid
d)
air
11.
How is a gas defined?
a)
Indefinite shape, indefinite volume
b)
Definite shape, definite volume
c)
Found in stars
d)
Definite volume, indefinite shape
12.
What term describes a solid changing to a gas?
a)
Deposition
b)
Sublimation
c)
Evaporation
d)
Freezing
13.
Particles (molecules) in a ______________________ have more energy than the other states of matter.
a)
gas
b)
solid
c)
liquid
14.
Molecules are closest together in a 
a)
Solid
b)
Liquid
c)
Gas
15.
Define a liquid.
a)
Indefinite shape, indefinite volume
b)
Definite shape, definite volume
c)
Found in stars
d)
Definite volume, indefinite shape
16.

Which 2 lab equipments are used to measure mass?

a)
b)
c)
d)
e)
17.

Which 3 lab equipments are used to measure volume?

a)
b)
c)
d)
e)
18.
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
19.
At what temperature is this substance melting?
a)
50C
b)
100C
c)
0C
20.
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
21.

What state/phase is the object likely from points A to B?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

22.

What is happening to the particles in the substance between points A and B?

a)

Melting

b)

Freezing

c)

Speeding Up

d)

Slowing Down

23.

Is the substance gaining or losing energy?

a)

Gaining

b)

Losing

24.
The graph shows a cooling curve for an unknown substance.  What is happening during segment DE?
a)
boiling
b)
condensation
c)
freezing
d)
melting
25.

What state/phase is the object likely from points C to D ?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

26.

The temperature at which a gas turns into a liquid

a)

Melting point

b)

Freeing point

c)

Boiling point

d)

Condensation point

27.

The temperature at which a substance changes from a liquid to a gas

a)

Melting point

b)

Boiling point

c)

Freezing point

d)

Condensation point

28.

A characteristic that can be observed or measured such as color, state, or hardness is referred to as a...

a)

Physical property

b)

Chemical property

c)

Physical change

d)

Chemical change

29.

Which list has only physical properties, no chemical properties?

a)

Color

Hardness

Toxicity

b)

Reactivity

Flammability

Hardness

c)

Freezing/Melting/Boiling Points

Flammability

d)

Malleability Conductivity

Density

30.

What is the difference between physical and chemical properties?

a)

Physical properties involve only the number of electrons, while chemical properties also involve the protons

b)

A physical property can be observed without changing the identity of the substance, while chemical properties involve changing the identity of the substance

c)

A chemical property can be observed without changing the identity of the substance, while physical properties involve changing the identity of the substance

d)

Chemical properties involve only the number of electrons, while physical properties also involve the protons

31.

Where are the Alkali Metals on the Periodic Table?

a)

Group 1

b)

Group 2

c)

Groups 3-12

d)

Groups 13-17

32.

Where are the Alkaline Metals on the Periodic Table?

a)

Group 1

b)

Group 2

c)

Groups 3-12

d)

Groups 13-17

33.

Where are the Transition Metals on the Periodic Table?

a)

Group 1

b)

Group 2

c)

Groups 3-12

d)

Groups 13-17

34.

Where are the nonMetals on the Periodic Table?

a)

Group 1

b)

Group 2

c)

Groups 3-12

d)

Groups 13-17

35.

How many valance electrons does Oxygen have? (atomic number 8)

a)

2

b)

4

c)

6

d)

8

36.

If I am a group 18 element (noble gasses) how many valance electrons do I have?

a)

2

b)

4

c)

6

d)

8

37.

How many valence electrons does Beryllium have? (atomic number 4)

a)

3

b)

+3

c)

-3

d)

2

38.

How many valence electrons does Hydrogen have? (atomic number 1)

a)

-1

b)

+1

c)

1

d)

2

39.

An element with 92 protons goes through Alpha decay, the new atomic number is...

a)

93

b)

92

c)

90

d)

88

40.

An element with 92 protons goes through Beta decay, the new atomic number is...

a)

93

b)

92

c)

90

d)

88

41.

How many elements are in this formula? SiO2

a)

2

b)

3

c)

4

d)

6

42.

How many atoms are in this formula? SiO2

a)

2

b)

3

c)

4

d)

5

43.

The half life of Radium-226 is 1600 years. How much of a 4 gram sample will remain in 800 years?

a)

1 gram

b)

2 grams

c)

3 grams

d)

4 grams

44.

The half life of Sodium-24 is 15 hours. If 1 gram has decayed from a sample that was originally 2 grams, how old is the sample?

a)

15 hours

b)

30 hours

c)

45 hours

d)

7.5 hours

45.
What is the mass number of this atom?
a)
1
b)
3
c)
4
d)
7
46.
What is the atomic number of this atom?
a)
2
b)
4
c)
6
d)
none of the above
47.
What is the mass number of this atom?
a)
1
b)
3
c)
4
d)
7
48.
What is the atomic number of this atom?
a)
2
b)
4
c)
6
d)
none of the above
49.

Choose the correct Bohr Model for Aluminum; a Period 3 element.

a)

b)

c)

d)

50.

What is incorrect about this Bohr Model?

a)

The nucleus is formatted incorrectly

b)

It has the wrong number of valence electrons

c)

It has an incorrect number of total electrons

d)

The electrons are paired incorrectly

51.

Assuming the atomic number is correct, what is incorrect about this Period 3 Bohr Model?

a)

The nucleus is formatted incorrectly

b)

It has the wrong number of valence electrons

c)

It has an incorrect number of total electrons

d)

The electrons are paired incorrectly

52.

Choose the correct Bohr Model for Boron; a Period 2 element.

a)

b)

c)

d)

53.

What is incorrect about this Bohr Model of Boron?

a)

The orbitals are filled incorrectly

b)

It has the wrong number of valence electrons

c)

It has an incorrect number of total electrons

d)

The electrons are paired incorrectly

54.

What is incorrect about this Bohr Model of Boron?

a)

The orbitals are filled incorrectly

b)

It has the wrong number of valence electrons

c)

It has an incorrect number of total electrons

d)

The electrons are paired incorrectly

55.

Choose the correct Bohr Model for Potassium; a Period 4 element.

a)

b)

c)

d)

56.

What is incorrect about this Bohr Model of Potassium; a Period 4 element?

a)

The orbitals are filled incorrectly

b)

It has the wrong number of valence electrons

c)

It has an incorrect number of total electrons

d)

The second orbital is not full

57.

What is incorrect about this Bohr Model of Potassium; a Period 4 element?

a)

The orbitals are filled incorrectly

b)

The nucleus is formatted incorrectly

c)

It has an incorrect number of orbitals

d)

The electrons are paired incorrectly

58.

Choose the correct Bohr Model for Neon; a Period 2 element.

a)

b)

c)

d)

59.

What is incorrect about this Bohr Model of Neon; a Period 2 element?

a)

The orbitals are filled incorrectly

b)

The nucleus is formatted incorrectly

c)

It has an incorrect number of orbitals

d)

The electrons are paired incorrectly

60.

What is incorrect about this Bohr Model of Neon; a Period 2 element?

a)

The orbitals are filled incorrectly

b)

The nucleus is formatted incorrectly

c)

It has an incorrect number of orbitals

d)

The electrons are paired incorrectly

61.

Choose the correct Bohr Model of Magnesium; a Period 3 element.

a)

b)

c)

d)

62.

What is incorrect about this Bohr Model of Neon; a Period 2 element?

a)

The orbitals are filled incorrectly

b)

The nucleus is formatted incorrectly

c)

It has an incorrect number of orbitals

d)

The electrons are paired incorrectly

63.

What is incorrect about this Bohr Model of Magnesium; a Period 3 element?

a)

The orbitals are filled incorrectly

b)

The nucleus is formatted incorrectly

c)

It has an incorrect number of orbitals

d)

In has the wrong number of electrons

64.
What percent of carbon-14 would be left after 5730 years?
a)
100%
b)
75%
c)
50%
d)
25%
65.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
66.
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
a)
100.0g
b)
50.0g
c)
12.5g
d)
8.5g
67.
146C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?
a)
4 years
b)
5730 years
c)
22,920 years
d)
28,650 years
68.
After the third half-life, how much of the sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
69.
What type of decay is being illustrated in following picture? 
a)
beta decay
b)
alpha decay 
70.
Which type of nuclear radiation is being emitted here?
a)
Alpha
b)
beta
c)
gamma 
d)
none
71.
You find a rock sample with radioactive atoms present.  If 12.5% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)
a)
zero
b)
1
c)
2
d)
3
72.
If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?
a)
25 years
b)
200 years
c)
400 years
d)
800 years
73.
The graph shows the radioactive decay of a 50-gram sample of a radioactive isotope. 
 According to the graph, what is the half-life of this isotope? 
a)
100 years
b)
150 years
c)
200 years
d)
300 years
74.
A helium nucleus with two protons and two neutrons is called a(n) ____.  
a)
alpha particle
b)
electroscope
c)
beta particle
d)
gamma ray
75.
How many electrons does Si contain? (click to see image)
a)
14
b)
28
c)
2
d)
4
76.
Elements which are shiny, conduct electricity and heat are called
a)
metal
b)
nonmetal
c)
metalloid
d)
nonexistent
77.
Group 18 elements are known as the _____ _____ and have full valence shells.
a)
royal gases.
b)
supreme solids.
c)
noble gases.
d)
legit liquids.
78.
Rows on the period table are called _____ while columns are called _____.
a)
groups, families
b)
groups, periods
c)
periods, groups
d)
families, groups
79.
The central region of an atom where its neutrons and protons are is called the
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
80.
 Why does group number 18 have the least reactive elements?
a)
They all have an odd number of protons.
b)
They all have an even number of protons. 
c)
They have the largest masses.
d)

Their outer electron shell is filled

81.
The period for Bromine is ___________.
a)
3
b)
2
c)
4
82.
What is the atomic mass of "F"
a)
9
b)
18
c)
17
d)
19
83.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

84.
Subatomic particles with a positive charge
a)
neutrons
b)
atomic mass
c)
protons
d)
isotopes
85.

What is one way Neutrons are different from electrons?

a)

they both are negative

b)

neutrons have no charge, while electrons have a negative charge

c)

Both are in the nucleus( center of atom)

d)

Electrons are inside nucleus and neutrons are outside the nucleus.

86.

What is the atomic number?

a)

35

b)

18

c)

17

d)

52

87.
An element's identity is determined by the number of
a)
electrons.
b)
protons.
c)
neutrons.
d)
valence.
88.
Which of the following chemical formulas represents a compound? 
a)
C3
b)
O2
c)
CH3CHO
d)
H2
89.

Water is considered a...

a)
element
b)
compound
c)
mixture
d)

Liquid

90.

How many "valance electrons" does chlorine have?

a)

7

b)

2

c)

17

d)

8

91.
Carbon-12, Carbon-13, and Carbon-14 are...
a)
ions
b)
isotopes
c)
electronegative
d)
radioactive
92.
How many Protons does Bromine have?
a)
45
b)
79.904
c)
80
d)
35
93.

Each isotope has...

a)
the same number of protons but different number of electrons
b)
same number of protons but different number of neutrons
c)
same number of electrons and neutrons
d)
same number of electrons, protons, and neutrons
94.
Not non-metals or metals but somewhere in between
a)
noble gases
b)
isotopes
c)
metalloids
d)
ions
95.

How many "valance electrons" does chlorine have?

a)
7
b)
2
c)
17
d)
8
96.
Carbon-12, Carbon-13, and Carbon-14 are...
a)
ions
b)
isotopes
c)
electronegative
d)
radioactive
97.
How many Protons does Bromine have?
a)
45
b)
79.904
c)
80
d)
35
98.
A particle with a negative charge inside of an element is called
a)
isotope
b)
neutron
c)
proton
d)
electron
99.
Elements that are gases, brittle, and not conductive are
a)
Metals
b)
Metalloids
c)
Transition Metals
d)
Non-metals
100.
Not non-metals or metals but somewhere in between
a)
noble gases
b)
isotopes
c)
metalloids
d)
ions

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