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Chemistry 1st Semester Exam

Total questions: 72

Worksheet time: 3600secs

Name
Class
Date
1.
An educated guess that has not been tested. 
a)
law
b)
theory
c)
hypothesis
d)
fact
2.
How many variables should you change in an experiment?
a)
none
b)
1
c)
2 or more
d)
depends on the type of experiment
3.

If you were testing how well different dish soaps cleaned grease, the independent variable would be the:

a)

dish type

b)

amount of grease

c)

dish soap type

d)

grease type

4.

Dory set up an experiment to see how the density of different materials affects buoyancy (the ability to float). What is the dependent variable?

a)

the volume (size) of the material

b)

tha type of material

c)

the density of the material

d)

the buoyancy of the material

5.

You are testing the time it takes for 3 different liquids to melt. Which variables should stay constant (not change) in your experiment? Check all that apply.

a)

liquid type

b)

liquid amount

c)

container type

d)

heat source

6.

In an experiment, the control group is the "normal conditions" setup that is not being tested on. What is the control group in Homer's experiment?

a)

amount of time the spray stays on the shower

b)

the half of the shower sprayed with water

c)

the half of the shower sprayed with coconut juice

d)

the amount of slime

7.

In an experiment, the experimental group is the setup being tested on. This group will be compared to the control "normal conditions" group. What is the experimental group in Homer's experiment?

a)

drink type

b)

# of paper stacks

c)

Group B

d)

Group A

8.

Which of the following is not a pure substance, and therefore does not have its own unique set of properties?

a)

atom

b)

element

c)

compound

d)

mixture

9.

Which of the following can be separated by undergoing a chemical reaction?

a)

atom

b)

element

c)

compound

d)

mixture

10.
What is this substance?
a)
element
b)
compound
c)
mixture of  2 diatomic elements
d)
mixture of an element & a compound
11.
What is this substance?
a)
element
b)
compound
c)
mixture of 2 compounds
d)
mixture of 2 elements
12.
What is this substance?
a)
element
b)
compound
c)
mixture of an element & a compound
d)
mixture of 2 compounds
13.

Which of the following are pure substances?

a)

Carbon dioxide (CO2)

b)

Milk

c)

Salt water

d)

Nitrogen (N2)

14.
Which of the substances below is a compound?
a)
air 
b)
blood
c)
Gold
d)
NaCl (table salt)
15.
Which of the substances below is a mixture?
a)
Carbon dioxide
b)
water
c)
soil
d)
Hydrogen
16.

What type of mixture is homogeneous?

a)

chocolate chip cookie

b)

black coffee

17.
What are the 2 characteristics of matter?
a)
volume & energy
b)
mass & energy
c)
volume & mass
d)
matter encompasses all
18.
The amount of space an object takes up. 
a)
volume
b)
mass
c)
matter
d)
energy
19.

The amount of atoms that a substance has.

a)

volume

b)

mass

c)

matter

d)

energy

20.
Gas has mass & takes up space.
a)
true 
b)
 false
21.
Which state of matter has a definite volume & an indefinite shape? 
a)
solid
b)
liquid
c)
gas
22.
Which state of matter has indefinite shape & volume?
a)
solid 
b)
liquid 
c)
gas
23.
True or false. Heat travels from an area lower concentration (object with less heat) to an area of higher concentration (object with more heat). Hint: Think about the heat transfer between ice & water in a glass.
a)
True
b)
False
24.
In which state of matter are the atoms spaced the farthest apart & are the most compressible?
a)
solid 
b)
liquid
c)
gas
25.
Dry ice is an example of what phase change.
a)
freezing
b)
melting
c)
vaporization/boiling
d)
sublimation
26.
When ice melts does kinetic energy decrease (release heat) or increase (absorb heat)?
a)
kinetic energy decreases & heat is released 
b)
kinetic energy increases & heat is absorbed
27.
What does "#4" represent on the graph? 
a)
melting 
b)
liquid phase
c)
boiling
d)
gas phase
28.
What does "#3" represent on the graph? 
a)
melting
b)
liquid phase
c)
boiling
d)
gas phase
29.
Which state of matter has the lowest kinetic energy (atoms move the slowest)?
a)
solid 
b)
liquid
c)
gas
30.
Which box has a higher density?  
a)
Box A
b)
Box B
c)
cannot be determined
d)
they are the same
31.
Calculate the density of the cube.
a)
2 g/cm3
b)
4 g/cm3
c)
6 g/cm3
d)
8 g/cm3
32.

A fish has a density of 5 g/mL. What is the mass of the fish?

a)

1.2 g

b)

5 mL

c)

30 g/mL

d)

30 g

33.
A gold brick has a density of 19.32 g/cm3. What is the density of half of the gold brick?
a)
9.66 g/cm3
b)
19.32 g/cm3
c)
38.64 g/cm3
d)
cannot be determined
34.
Put the liquids in order from most dense to least dense?
a)
4, 3, 2, 1
b)
1, 2, 3, 4
c)
3, 4, 2, 1, 
d)
4, 3, 1, 2
35.
The table below lists the densities of five metals. All of the following metals will float in mercury except...
a)
copper
b)
gold
c)
silver 
d)
zinc
36.

According to the picture from left to right, which of the answers is correct?

a)

neurally buoyant, positively buoyant, negatively buoyant

b)

negatively buoyant, neutrally buoyant, positively buoyant

c)

positively buoyant, neutrally buoyant, negatively buoyant

d)

neutrally buoyant, negatively buoyant, positively buoyant

37.

At which of these temperatures is the viscosity of the fluid highest? (see graph)

a)

40 °C

b)

60 °C

c)

80 °C

d)

100 °C

38.

Which graduated cylinder has the highest viscosity

a)

The graduated cylinder with the ball at 20mL.

b)

The graduated cylinder with the ball at 30mL.

c)

The graduated cylinder with the ball at 40mL.

d)

The graduated cylinder with the ball at 50mL.

39.
Two liquids are poured out of containers at the same height & time. Liquid 1 empties from the container before liquid 2. Which liquid has a lower viscosity? 
a)
liquid 1
b)
liquid 2
c)
both liquids have the same viscosity
d)
cannot be determined
40.

Which of the following are examples of chemical properties?

a)

Conductivity

b)

Flammability

c)

Reactivity

d)

Malleability

41.

Which of the following are examples of chemical changes?

a)

Burning paper

b)

Cutting paper

c)

Iron rusting

d)

dyeing water

42.

Which of the following are physical changes?

a)

Cutting your hair

b)

Fruit rotting

c)

Water boiling

d)

Dropping an alka-seltzer in water

43.

Which of the following are examples of intensive properties?

a)

Conductivity

b)

Mass

c)

Length

d)

Density

44.

Which of the following are extensive properties?

a)

Mass

b)

Volume

c)

Density

d)

Temperature

45.

Which of the following are examples of physical properties?

a)

Luster

b)

Toxicity

c)

Combustibility

d)

Boiling point

46.
This bullseye demonstrates...
a)
High Accuracy & High Precision
b)
High Accuracy & Low Precision
c)
Low Accuracy & High Precision
d)
Low Accuracy & Low Precision
47.
?
a)
High Accuracy & High Precision
b)
High Accuracy & Low Precision
c)
Low Accuracy & High Precision
d)
Low Accuracy & Low Precision
48.
Describe the accuracy and precision of the image
a)
Accurate and Precise
b)
Accurate and not precise
c)
Not Accurate and Precise
d)
not accurate and not precise
49.

The distance from Earth to the moon is 384,400 km. Express the distance in meters using scientific notation

a)

3.844 x 105

b)

3.844 x 106

c)

3.844 x 104

d)

3.855 x 10-5

50.

How would you write 5.6 x 10-3 in standard form?

a)

56,000

b)

5,600

c)

0.00056

d)

0.0056

51.
a)
Student A
b)
Student B
c)
Student C
d)
Cannot be determined
52.
a)
Student A
b)
Student B
c)
Student C
d)
Cannot be determined
53.
a)
0.81%
b)
0.47%
c)
99.8%
d)
0.18%
54.
The students measured length during a science experiement, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?
a)
15.79%
b)
18.75%
c)
2.25%
d)
18%
55.

How many significant figures does the following number have: 1740200

a)

2

b)

7

c)

3

d)

5

56.
How many sig figs are in 0.0045670?
a)
8
b)
4
c)
5
d)
7
57.

Which is the more precise measurement?

a)

4 mL

b)

4.3 mL

c)

4.30 mL

d)

4.300 mL

58.

Jonathan raised 60 goats, then he traded all the goats for sheep at an exchange rate of 5 goats for 7 sheep. Next, he exchanged all the sheep for hogs at a rate of 4 sheep for 2 hogs. How many hogs did he get?

a)

62 hogs

b)

42 hogs

c)

84 hogs

d)

86 hogs

59.

Eggs are shipped from a farm in trucks. Each carton of eggs holds 12 eggs. The cartons of eggs are placed in a crate that holds 20 cartons, which are packed in trucks that each carry 3130 crates of eggs. How many truckloads will it take to carry 3.75 x 106 eggs? [Round your answer to 1 sig fig]

a)

3 trucks

b)

4 trucks

c)

5 trucks

d)

9 trucks

60.

You roof has a leak. If it leaks at a rate of 14 drops per minute, how many hours will it take to fill a 5 gallon bucket? (20 drops = 1 mL; 30 mL = 1oz; 64 oz = 1 gal) [Round answer to 2 sig figs]

a)

230 hours

b)

950 hours

c)

190 hours

d)

1900 hours

61.

Identify #1

a)

proton

b)

neutron

c)

electron

d)

nucleus

62.

Identify #2

a)

proton

b)

neutron

c)

electron

d)

nucleus

63.

Identify #3

a)

proton

b)

neutron

c)

electron

d)

nucleus

64.

Identify #4

a)

proton

b)

neutron

c)

electron

d)

nucleus

65.

The periodic table is in order by the

a)

Mass number

b)

Neutron number

c)

Atomic number

d)

APE MAN Number

66.

The atomic number identifies the number of __________.

a)

electrons

b)

atoms

c)

protons

d)

neutrons

67.

Atoms of the same element with a different number of neutrons

a)

Ion

b)

unstable

c)

Isotope

d)

neutral atom

68.

A charged atom

a)

Ion

b)

Isotope

c)

unstable

d)

neutral atom

69.

Which subatomic particle determines the charge of an atom?

a)

protons

b)

neutrons

c)

electrons

70.

The max amount of electrons that can be held on the 1st & 2nd energy levels of an atom are _____ and _____.

a)

2, 4

b)

4, 8

c)

2, 8

d)

4, 6

71.

How do you find the atomic mass # of an atom?

a)

protons + neutrons

b)

protons + electrons

c)

electrons + neutrons

d)

# of protons

72.

How many valence electrons does this atom have?

a)

12

b)

8

c)

2

d)

10

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