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District 1 Review

Total questions: 105

Worksheet time: 1hrs 19mins

Name
Class
Date
1.

Why might someone use prefixes in measurements?

a)

To make numbers larger

b)

To avoid very large or very small numbers

c)

To confuse others

d)

To change the unit type

2.

What is the dependent variable (DV) in an experiment?

a)

The variable that is purposely changed.

b)

The variable that is measured in response to the IV.

c)

The variable that is kept constant.

d)

The variable that is not recorded.

3.

Why is it important to have controlled variables (constants) in an experiment?

a)

To make the experiment more interesting.

b)

To ensure that any effects seen are due solely to the independent variable.

c)

To reduce the number of trials needed.

d)

To make the experiment easier to perform.

4.

Which unit would make the most sense for measuring the mass of a mouse?

a)

g

b)

kg

c)

m

d)

mm

5.

Which unit would you use to measure the length of a basketball court?

a)

mm

b)

m

c)

km

d)

g

6.

Why is it important to use the correct unit when making scientific measurements?

a)

It makes the measurement easier to remember

b)

It ensures accuracy and clear communication

c)

It makes the measurement look bigger

d)

It is required by law

7.

Which of the following numbers has exactly four significant figures?

a)

0.601

b)

1,049

c)

0.3333

d)

10,900

8.

If you start with a number greater than 1 in scientific notation, what sign will the exponent have?

a)

Positive

b)

Negative

c)

Zero

d)

Fractional

9.

Why is scientific notation useful in chemistry?

a)

It makes it easier to work with very large or very small numbers.

b)

It helps convert between different units.

c)

It is required for all chemical equations.

d)

It is used to balance chemical reactions.

10.

Given a mixture of saltwater, how could you separate the salt from the water?

a)

By using a magnet

b)

By chemical reaction

c)

By physical means such as evaporation

d)

By adding more water

11.

Which of the following is an example of an extensive property?

a)

Density

b)

Mass

c)

Melting point

d)

Specific heat

12.

What is a key difference between physical and chemical properties?

a)

Physical properties can only be observed by changing the substance’s identity.

b)

Chemical properties can be observed without changing the substance’s identity.

c)

Physical properties can be observed without changing the substance’s identity.

d)

Chemical properties do not involve any change in energy.

13.

According to the Law of Conservation of Matter, what happens during a chemical change?

a)

Matter is destroyed

b)

Matter is created

c)

Matter changes forms but is neither created nor destroyed

d)

Matter disappears

14.

Which of the following is a compound (C)?

a)

Mercury

b)

Water

c)

Iron

d)

Aluminum

15.

Which of the following mixtures is homogeneous (HO)?

a)

Pizza

b)

Sand

c)

Saltwater

d)

Air

16.

Given a diagram with different types of atoms, some bonded in pairs and some single, which classification fits best?

a)

Element

b)

Compound

c)

Mixture of elements and compounds

d)

Mixture of compounds

17.

Why do wires, like your phone charger, have materials like metal on the inside and materials like rubber on the outside?

a)

To provide color

b)

To improve taste

c)

To combine different properties for function and safety

d)

To make them heavier

18.

Would you classify conductivity as an extensive or intensive property?

a)

Extensive

b)

Intensive

c)

Both

d)

Neither

19.

If 95.0 g of water (c of water = 4.18J/goC) increases in temperature from 23.1oC to 36.5oC, the water...

a)

absorbs 5320 J of heat

b)

releases 5320 J of heat

c)

absorbs 14500 J of heat

d)

releases 1273 J of heat

e)

absorbs 1273 J of heat

20.
For the formula:
 Q= m c ∆T
The  units for specific heat are:
a)
g /J C
b)
°C/g J
c)
kJ/g
d)
J/g°C
21.

If the specific heat of water is 4.184 J/g∙°C, how much heat is required to increase the temperature of 1200.0 g of water from 23.00 °C to 39.00 °C?

a)

-80,330 J

b)

+115,400 J

c)

+80,330 J

d)

+195,800 J

22.

What does "ΔT" mean?

a)

A change in time

b)

A change in heat

c)

A change in energy

d)

A change in temperature

23.

In an exothermic reaction …….

a)

heat energy is given out

b)

heat energy is taken in

c)

nothing happens

d)

don't know????

24.

In an Endothermic Reaction.....

a)

nothing happens

b)

I don't know!!!

c)

Heat Energy is given out

d)

Heat Energy is taken in

25.
How many sig figs are there?
100.00
a)
1
b)
3
c)
4
d)
5
26.
How many sig figs are there?
100000000
a)
1
b)
9
c)
10
27.
How many sig figs are there?
4004
a)
1
b)
2
c)
3
d)
4
28.
How many sig figs are there?
9009.00
a)
2
b)
4
c)
5
d)
6
29.
How many sig figs are there?
0.00400
a)
1
b)
3
c)
5
d)
6
30.
How many sig figs are there?
5.00000008
a)
2
b)
6
c)
9
31.
How many sig figs are there?
27000000
a)
2
b)
5
c)
8
32.
How many sig figs are there?
4000.
a)
1
b)
3
c)
4
33.
Calculate 923 g ÷ 20312 cm3 and give your answer with the correct number of significant figures.
a)
0.04 g/cm3
b)
0.045 g/cm3
c)
0.0454 g/cm3
d)
0.05 g/cm3
34.
Calculate 1.23 m x 0.89 m and give your answer with the correct number of significant figures.
a)
1.0 m2
b)
1.1 m2
c)
1.0947 m2
d)
1.095 m2
35.
Calculate 7.987 m - 0.54 m and give your answer with the correct number of significant figures.
a)
7.45 m
b)
7.447 m
c)
7.4 m
d)
7.5 m
36.
Calculate 12.47 m ÷ 3.2 s and give your answer with the correct number of significant figures.
a)
4 m/s
b)
3.9 m/s
c)
3.90 m/s
d)
3.897 m/s
37.
Calculate 0.020 cm x 50 cm x 11.1 cm and give your answer with the correct number of significant figures.
a)
10 cm3
b)
11.1 cm3
c)
11 cm3
d)
11. cm3
38.
Which of the following numbers have four significant figures?
a)
56.75 g
b)
40.01 g
c)
0.6000 g
d)
all of the choices
39.
All of the following have one significant figure except:
a)
100 cm
b)
0.0001 cm
c)
2 cm
d)
2.00 cm
40.
Which of the following numbers has three significant figures?
a)
1014 miles
b)
101 feet
c)
1000 yards
d)
all of the choices
41.
How many significant figures does the following number have: 0.998005
a)
9
b)
10
c)
6
d)
5
42.
How many significant figures does the following number have: 0.002040
a)
6
b)
4
c)
3
d)
2
43.
How many sig figs are there?
0.000008
a)
1
b)
2
c)
6
d)
7
44.

How many significant figures: 450 m

a)

3

b)

2

c)

1

d)

0

45.

A balance is used to measure (a)  

46.

If you spill chemicals on yourself, you should use the _____ ______

(a)  

47.

Used to transfer liquids in SMALL, PRECISE amounts.

(a)  

48.

NOT the place for broken glass.

(a)  

49.

This is used to (a)   chemicals

50.

A beaker is used to (a)   liquids

51.

Best approach for putting out a fire on a person

a)

Safety Shower

b)

Fire Blanket

52.

What does this hold? (1 thing, 2 words )

(a)  

53.

Who should wear these during a lab?

a)

everyone

b)

anyone who doesn't wear glasses

c)

anyone who wants to

d)

anyone who doesn't wear either glasses or contacts

54.

To use a fire extinguisher you should

p____, a___, s____, s_____

(a)  

55.

If you need to smell a chemical in a lab, the correct procedure is to (a)  

56.

When something goes wrong, especially if there is any accidents, the first person you should tell is the (a)  

57.

Used to measure length. (1 thing, two words)

(a)  

58.

Used to heat chemicals, and is powered by gas, not electricity.

(a)  

59.

No excuses! At the end of a lab, you should always _________ __

(a)  

60.

Used to measure temperature.

(a)  

61.
How would you write 564,000,000 in scientific notation?
a)
5.64 x 10-7
b)
5.64 x 106
c)
5.64 x 108
d)
56.4 x 107
62.
When writing a number in scientific notation, the first number must be greater than 1, but less than 10.
a)
False
b)
True
63.
How do you write
1001
in scientific notation?
a)
1.0001 x 104
b)
1.01 x 105
c)
1.001 x 103
d)
10.1 x 103
64.
Express the following in scientific notation:
.000457
a)
457 x 106
b)
457 x 10-6
c)
4.57 x104
d)
4.57 x 10-4
65.
What is scientific notation?
a)
A long way to write really short  numbers
b)
A short way to write really long numbers
c)
I don't know...
d)
None of the above
66.
UNDERSTANDING
If the exponent is a positive number...
a)
you will get a large number
b)
you will get a smaller number
67.
UNDERSTANDING
If the exponent is a negative number...
a)
you will get a large number
b)
you will get a small number
68.
When your exponent is negative, you move your decimal....
a)
to the right
b)
to the left
c)
to both sides
d)
nowhere.... the decimal goes nowhere
69.
Which of the following is correct scientific notation?
a)
20.35 x 104
b)
.2035 x 104
c)
2035 4
d)
2.035 x104
70.
What is 7.0 x 10-5 in standard form? 
a)
.0007
b)
.00007
c)
.000007
d)
.0000007
71.
How do you write
8.317 x 106
in standard form?
a)
8, 371, 000
b)
83, 170, 000
c)
837, 100
d)
8, 317, 000
72.
Put the following in scientific notation:
23,948
a)
23.948 x 103
b)
2.3948 x 104
c)
2.3948 x 10-4
d)
0.23948 x 105
73.

A block has a mass of 20.0 g and a volume of 40.0 cm3. What is its density?

a)

2.0 g/cm3

b)

1.2 g/cm3

c)

0.5 g/cm3

d)

4.0 g/cm3

74.
The mass of an object is 30 g.  The volume is 5 mL.  What is the density of this object?
a)

3 g/cm

b)
6 g/mL
c)

8 g

75.
If you have a gold brick that is 2 cm by 3 cm by 4 cm and has a density of 19.3 g/cm3, what is its mass?
a)

263.5 g/cm3

b)
463.2 g
c)
0.804 kg
d)

2.804 g

76.

Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?

a)

9 mL

b)

7 g/cm3

c)

28 g/cm3

d)

1/7 g/cm3

77.

A piece of copper has a mass of 89g and a volume of 10.0 cm3. What would be the density of the copper?

a)

0.89 g/cm3

b)

89 g/cm3

c)

8.9 g/cm3

d)

890 g/cm3

78.

Use the density chart to identify the substance. If the substance has a volume of 5 cm3 and a mass of 52.5.

a)

lead

b)

aluminum

c)

silver

d)

water

79.
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
80.
What is the density of a plastic ball that has a volume of 6cm3 and a mass of 12g? 
a)
2g/cm3
b)
.5g/cm3
c)
72g/cm3
d)
4mL
81.
A mechanical pencil has the density of 3.000 g/cm3.  The volume of the pencil is 15.8 cubic centimeters.  What is the mass of the pencil?
a)
47.4 g
b)
50 g
c)
0.190  g
d)
5.27 g
82.

As part of a classifying elements lab Joe was finding the density of different samples. One sample had a mass of 26.4 and a volume of 12 mL. What element is it?

a)

Sulfur

b)

Carbon

c)

Boron

d)

Krypton

83.

Find the density of a 2 cm x 2 cm x 2 cm cube with a mass of 64 g.  

(Hint: find the volume first!)

a)

13 g/cm3

b)

2 g/cm3

c)

10 g/cm3

d)

8  g/cm3

84.

If a block of wood has a density of 0.6 g/cm3 and a mass of 120 g, what is its volume?

a)

300 cm3

b)

200 cm3

c)

100 mL

d)

150 cm3

85.

Which box has a higher density?

a)

A

b)

B

c)

They both have the same density.

86.

What is matter?

a)

All objects, people, and animals

b)

All living and nonliving things in the universe.

c)

anything that has mass and takes up space

d)

All of the above.

87.

What state of matter is pictured above?

a)

solid

b)

liquid

c)

gas

88.

What state of matter is pictured above

a)

solid

b)

liquid

c)

gas

89.

What state of matter is pictured above?

a)

solid

b)

liquid

c)

gas

90.

What is the process that turns a liquid into a solid?

a)

melting

b)

freezing

c)

evaporation

d)

condensation

91.

Is a change in a substance's states of matter a physical change or chemical change?

a)

Chemical

b)

Physical

92.

Select all of the following images that show a physical change:

a)

b)

c)

d)

93.

In which state of matter are the particles the moving the fastest?

a)

solid

b)

liquid

c)

gas

94.

What is the process that turns a solid into a liquid?

a)

melting

b)

freezing

c)

evaporation

d)

condensation

95.

What is the process that turns a gas into a liquid?

a)

melting

b)

freezing

c)

evaporation

d)

condensation

96.

What is the process that turns a liquid into a gas?

a)

melting

b)

freezing

c)

evaporation

d)

condensation

97.

Water is an example of what state of matter?

a)

solid

b)

liquid

c)

matter

d)

melting

98.

Helium is an example of what state of matter?

a)

solid

b)

liquid

c)

gas

d)

evaporation

99.

A desk is which of the following states of matter?

a)

solid

b)

liquid

c)

gas

d)

evaporation

100.

Volume is the amount of space an item takes up.

a)

True

b)

False

101.

Which of the following describes a chemical change?

a)

melting butter

b)

milk spoiling

c)

cutting paper

d)

water evaporating

102.

An ice cream melting on a counter is an example of a

a)

physical change

b)

chemical change

c)

no change

d)

both a physical and a chemical change

103.

Which statement is true?

a)

A chemical change can be reversed

b)

A physical change cannot be reversed

c)

Physical changes create a new substance

d)

Chemical changes create a new substance

104.

Which state of matter has a definite shape and volume?

a)

solid

b)

liquid

c)

gas

d)

plasma

105.

Which of the following is an example of a physical change?

a)

burning wood

b)

rusting iron

c)

dissolving sugar in water

d)

digesting food

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