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Chemistry Midterm

Total questions: 65

Worksheet time: 1hrs 4mins

Name
Class
Date
1.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)
Homogenous
c)
Heterogenous
d)
Salty
2.
Are made from a combination of 2 or more elements in a constant ratio...
a)
Atome
b)
Mixture
c)
Compounds
d)
Elements
3.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
4.
What units can be used to express density?
a)
g/mL
b)
grams
c)
millimeters
d)
milliliters
5.
A bar of copper has a mass of 216g and a volume of 24cm3. What is the density of copper?  
a)
9g/cm3
b)
.11g/cm3
c)
5184g/cm3
d)
322mL
6.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
7.
Properties that can be observed without changing the identity of the substance.
a)
Physical
b)
Chemical
8.
Example for physical property
a)
melting point
b)
flammability
c)
reactivity 
d)
combustion
9.
Example for chemical property
a)
malleability
b)
texture
c)
combustion
d)
sour taste
10.

Thomson concluded that cathode rays have a negative charge. Why did his experiment lead him to this conclusion?

a)

Opposite charges attract

b)

Like charges attract

c)

Opposite charges repel

d)

Like charges repel

11.

Rutherford discovered what subatomic particle through his experimentation?

a)

The proton

b)

The neutron

c)

The electron

d)

The quark

12.
Isotopes of the same element have different ____________. 
a)
 numbers of protons  
b)
numbers of electrons
c)
 symbols 
d)
numbers of neutrons
13.
The atomic number of an atom or ion refers to the number of:
a)
neutrons
b)
protons
c)
nucleons
d)
electrons
14.
How many electrons does potassium K contain? (click to see image)
a)
19
b)
39
c)
20
d)
40
15.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
16.
which explanation of this notation is correct?
a)
 12 is proton #
b)
6 tells you there are 6 neutrons
c)
6 tells you there are 6 protons
d)
12 is not a mass # here
17.
Which particles are found in the nucleus
a)
electrons and protons
b)
neutrons and protons
c)
neutrons and electrons
d)
footballs and soccer balls
18.

What element is represented in this Bohr Model?

a)

Carbon

b)

Hydrogen

c)

Aluminum

d)

Lithium

19.
What is the name of this element?
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon
20.
An element with five valence electrons is
a)
phosphorus
b)
oxygen
c)
beryllium
d)
rubidium
21.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
22.

What is the correct Lewis Dot Structure for ammonia NH3

a)
b)
c)
d)
23.

This is a correct dot diagram for neon (Ne)

a)

true

b)

false

24.

What is the goal of the Lewis Dot Structure?

a)

To determine the electron position.

b)

To show the element's valence electrons & bonding capabilities.

c)

To find the atomic mass of an element.

d)

To search for the number of electrons in an individual atom.

25.
A(n) _________ is an ion with a positive (+) charge.
a)
anion
b)
cation
c)
ion
d)
solute
26.
A(n) _________ is an ion with a positive (+) charge.
a)
anion
b)
cation
c)
ion
d)
solute
27.
When an atom loses an electron, it becomes a:
a)
positive ion
b)
negative ion
c)
neutral ion
d)
neutral atom
28.
Which of the following is a characteristic property of ionic compounds?
a)
They form hard, brittle crystals with characteristic shapes
b)
They have low melting points
c)
They have low boiling points
d)
They contain no charged particles
29.
Ionic bonds form between metals and ____.
a)
metalloids
b)
metals
c)
nonmetals
30.

If an atom has no charge, which of the following must be true?

a)

It has more neutrons than protons or electrons.

b)

There are only neutrons inside the atom.

c)

Its number of protons is equal to its number of electrons.

d)

The neutrons in the atom outnumber the electrons and protons.

31.
Which three nonmetals exist only as diatomic molecules?
a)
H, C, Br
b)
N, O, S
c)
I, F,N
d)
H, O, P
32.
What is the oxidation number of N in NO2-1?
a)
-3
b)
+4
c)
-2
d)
+3
33.
Where are the metals on the Periodic Table?
a)
To the left
b)
In the upper right hand corner
c)
On the zigzag line
d)
At the bottom
34.
Where are the nonmetals on the Periodic Table?
a)
To the left
b)
In the upper right hand corner
c)
On the zigzag line
d)
At the bottom
35.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

36.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

37.
 Which of the following is the correct formula for these two ions:
Al+3 +  S-2
a)
AlS3
b)
Al2S3
c)
Al3S2
d)
Al3S
38.
When you add the number of protons and neutrons together, you are calculating...
a)
Atomic Number
b)
Atomic Mass
c)
Mass Number
d)
Pythagorean's Theorem
39.
What is an element that has a different number of neutrons called?
a)
ion
b)
isotope
c)
carbon
d)
radioactive
40.
Characteristic that can be observed such as color, state, or hardness
a)
physical property
b)
chemical property
c)
density
d)
mass
41.
Example of a chemical change
a)
baking cookies
b)
grinding flour
c)
melting popsical
d)
cutting a piece of paper
42.
During physical changes, matter always retains its
a)
identity
b)
shape
c)
size
d)
color
43.
When a solid turns into a liquid
a)
freezing
b)
melting
c)
evaporating
d)
condensing
44.
What is the electron configuration of sodium?
a)
2.8
b)
2.8.2
c)
2.8.1
d)
11
45.

How many electrons can go on the first shell?

a)

1

b)

2

c)

3

d)

4

46.

How many electrons can go on the second shell?

a)

2

b)

4

c)

6

d)

8

47.

When can you perform experiments?

a)

Anytime I want

b)

When nobody is looking

c)

When the teacher gives me permission

d)

When my friends says I can

48.

What type of horseplay is okay in the lab?

a)

Wresting

b)

Tests of Strengths

c)

All of the Above

d)

NONE, the lab is no place for this

49.

When should I study the lab procedure?

a)

Before I come to class

b)

When I get to school

c)

During lab

d)

After the lab has ended

50.
Which of the following numbers has three significant figures?
a)
1014 miles
b)
101 feet
c)
1000 yards
d)
all of the choices
51.
How many significant figures does the following number have: 0.002040
a)
6
b)
4
c)
3
d)
2
52.
How many significant figures does the following number have: 0.998005
a)
9
b)
10
c)
6
d)
5
53.
Round 0.010229 to four significant figures
a)
1022
b)
1023
c)
0.01023
d)
0.01022
54.
Calculate 5.50 cm + 5.5 cm and give your answer with the correct number of significant figures.
a)
11 cm
b)
11.0 cm
c)
11.00 cm
d)
11.000 cm
55.
An object with which of the following densities will float on water?
a)
0.7 g/cm3
b)
1.2 g/cm3
c)
3.5 g/cm3
d)
11.4 g/cm3
56.
A can of Coke will sink in a bowl of water.  A can of Diet Coke will float in a bowl of water.  What does this tell you about the density of the Diet Coke?
a)
it is bigger than 1
b)
it is smaller than 1
c)
it is equal to 1
d)
it is equal to -1
57.
Why do ice cubes float in a  glass of water?
a)
the ice cubes are more dense than the water
b)
the water is more dense than the ice cubes
c)
the water is more dense than the glass
d)
the ice is more dense than the glass
58.
What is the density of water?
a)
0 g/ml
b)
1 g/ml
c)
10 g/ml
d)
100 g/ml
59.
What is the density of a substance that has a mass of 30g and a volume of 6 liters?
a)
24 g/l
b)
5 g/l
c)
36 g/l
d)
180 g/l
60.
Nitrogen will form which of the following ions?
a)
N
b)
N-3
c)
N-5
d)
N+5
61.
Boron will ____ valence electrons when forming an ionic bond.
a)
lose three
b)
gain three
c)
lose 5
d)
gain 5
62.
Nitrogen will ____ valence electrons when forming an ionic bond.
a)
gain 1
b)
lose 1
c)
gain 3
d)
lose 3
63.
Same repel, opposites
a)
avoid
b)
attract
c)
push
d)
pull
64.
What is a valence electron?
a)
The sum of neutrons and protons.
b)
The # of electrons in the last shell.
c)
A type of bond.
d)
A popular compound.
65.

What is the formula for the ammonia molecule shown below?

a)

NH

b)

NH3

c)

N3H3

d)

N3H

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