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Worksheets

Science 8th grade

Total questions: 158

Worksheet time: 2hrs 9mins

Name
Class
Date
1.
 The statement based on repeated experimental observations that describe how the universe works under certain conditions is known as:
a)
investigation
b)
scientific law
c)
observation
d)
scientific theory
2.
________ is the process of obtaining information by using the senses. 
a)
analyze
b)
inference
c)
observation
d)
hypothesis
3.

What do you measure for results (outcome)?

a)

Dependent variable

b)

Hypothesis

c)

Experimental Group

d)

Constants

4.

If an animal shelter wants to see if a certain dog food causes a dog to gain weight, which of the following would NOT be a constant or controlled variable?

a)

Type of dog food given

b)

Amount of dog good given

c)

Time of day food is given

d)

Amount of exercise dog is given

5.

Which of the following is not an example of quantitative data?

a)

Temperature

b)

Speed

c)

Height

d)

Texture

6.

Why do many experiments include several trials instead of a single trial?

a)

Repetition of trials increases the accuracy of the results

b)

Repetition of trials decreases the sample size of the experiment.

c)

Repetition of trials makes data easier to analyze.

d)

It is not necessary to repeat trials

7.

1. Aside from repeating a scientific experiment, what else must a scientist do to increase the accuracy of the results?

a)

Change the hypothesis

b)

Share data with other scientists for them to repeat or replicate

c)

Analyze the data faster

d)

Keep the data for themselves

8.

Quantitative data can be

a)

seen

b)

measured

c)

manipulated

d)

heard

9.

How is a hypothesis different from a theory?

a)

A theory has evidence to back it up and a hypothesis is an educated guess as to what is going to happen.

b)

They are both the same. They both are guesses as to what happens in the natural world.

c)

A theory is an opinion about how something works but a hypothesis has scientific evidence to support it.

d)

A hypothesis is used in science and a theory is used in society.

10.
At one point in time, many people thought disease was caused by fate or by incorrect behavior. Following the invention of the microscope, bacteria were discovered. After this, a new theory of what causes disease arose that was known as the germ theory.  Why was the original theory modified? 
a)
It quickly became obvious that germs cause disease.
b)
The person who invented the microscope became ill.
c)
New evidence prompted revision to the original ideas.
d)
The proponents of the germ theory had political power.
11.

Jennifer wanted to study the effect of sunlight on plant growth. So she decided to expose 10 identical plants to various amounts of sunlight each day (2 hours, 3 hours, 4 hours, 5 hours, and 6 hours). After one month, she measured the weight of the plants. What was the independent variable?

a)

Hours of sunlight

b)

Plant weight

c)

Type of plant

12.

Scientific theories...

a)

describe.

b)

explain.

13.

Scientific laws...

a)

describe.

b)

explain.

14.

Jennifer wanted to study the effect of sunlight on plant growth. So she decided to expose 10 identical plants to various amounts of sunlight each day (2 hours, 3 hours, 4 hours, 5 hours, and 6 hours). After one month, she measured the weight of the plants. What was the dependent variable?

a)

Hours of sunlight

b)

Plant weight

c)

Type of plant

15.

Possible explanation for an observation that can be tested.

a)

Hypothesis

b)

Scientific Law

c)

Scientific theory

d)

Critical Thinking

16.
What are the three base units?
a)
mass,length,grams
b)
meters,length,grams
c)
measuring,liters,games
d)
meters,liters,grams
17.
what is the name for the following?   mL
a)
megaliter
b)
megalift
c)
Meterliter
d)
milliliter
18.
The distance between New York City and Miami, Florida would be measured in __?__.
a)
kilometers (km)
b)
meters (m)
c)
centimeters (cm)
d)
millimeters (mm)
19.
The volume of a glass of orange juice would be measured in __?__.
a)
liters  (L)
b)
cubic meters  (m3)
c)
milliliters  (mL)
d)
kilograms  (kg)
20.

The SI unit for mass is.....

a)

grams

b)

meters

c)

pounds

d)

liters

e)

ounces

21.

The SI unit for volume is.....

a)

grams

b)

meters

c)

pounds

d)

liters

e)

ounces

22.

The SI unit for length is.....

a)

inches

b)

meters

c)

pounds

d)

yards

e)

ounces

23.
There are _______ grams in 1 kilogram
a)
1
b)
10
c)
100
d)
1000
24.

What would you use to measure the mass of this?

a)

Grams

b)

Kilograms

25.

Which unit is not used in the metric system?

a)

meter

b)

gram

c)

pound

d)

liter

26.

All matter is made of _________.

a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
27.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A molecule
d)
A nucleus
28.
The positively charged particles of an atom are the ________.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
29.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
DNA and RN
30.

Atoms are made up of ________________

a)

energy

b)

electrons

c)

subatomic particles

d)

gasses

31.

The subatomic particles that make up an atom.

a)

solid, liquid, gas

b)

electrons, protons, nucleus

c)

energy, protons, nucleus

d)

electrons, protons, neutrons

32.

__________ are negatively charged particles that are in the orbitals around the nucleus.

a)

protons

b)

nucleus

c)

neutrons

d)

electrons

33.

A proton has a ___________ charge.

a)

positive

b)

negative

c)

neutral

d)

massive.

34.

An electron has a _________ charge

a)

positive

b)

neutral

c)

negative

d)

massive

35.

A neutron has _________ charge or is ________.

a)

negative ... neutral

b)

positive .... neutral

c)

no .... negative

d)

no ... neutral

36.
Which is an electron?
a)
A
b)
B
c)
C
37.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

38.

What is the chemical symbol for Hydrogen

a)

H

b)

He

c)

Hy

d)

Hg

39.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
40.
an atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
41.
Which statement best describes an electron?
a)
Smaller mass than a proton and a negative charge
b)
Smaller mass than a proton and a positive charge
c)
Greater mass than a proton and a negative charge
d)
Greater mass than a proton and a positive charge
42.
In an atom, what is the number of protons equal to?
a)
the number of electrons
b)
the number of neutrons
c)
the number of molecules
d)
the number of nuclei
43.
The nucleus of an atom can be described as:
a)
spacious and negatively charged
b)
dense and positively charged
c)
spacious and positively charged
d)
dense and negatively charged
44.
True or False: The majority of an atom is made up of empty space
a)
True
b)
False
45.

What does atom mean?

a)

small

b)

visible

c)

indivisible

d)

particle

46.
Where electrons are likely to be found as they travel around the nucleus
a)
Nucleus
b)
Electron Cloud
c)
Within a Proton
d)
Within a Neutron
47.

Elements which are shiny, conduct electricity and heat are called

a)

metal

b)

metalloid

c)

nonmetal

d)

nonexistent

48.

Atoms with similar properties are most likely located...

a)

in the same period.

b)

in different periods.

c)

in the same group.

d)

to the right and left of each other.

49.

How are elements ordered on the Periodic Table?

a)

Alphabetical Order

b)

By their atomic mass.

c)

By their color.

d)

By their atomic number.

50.

Rows on the period table are called _____ while columns are called _____.

a)

groups, families

b)

periods, groups

c)

groups, periods

d)

families, groups

51.

Nonmetals do NOT have which of the following characteristics:

a)

Shiny

b)

Brittle

c)

Many are gasses

d)

Good insulators

52.

Which of the following is the best description of an element?

a)

A substance that cannot be broken down into simpler substances

b)

A naturally occurring mineral made of more than one substances

c)

A small particle made with a specific chemical composition

d)

A collection of atoms that have different abilities when joined together

53.

How many of these substances are an example of an element?

a)

1

b)

2

c)

3

d)

4

54.

How are elements and compounds different?

a)

A compound is represented by a chemical formula, and elements are represented by a chemical symbol.

b)

Compounds are represented by chemical symbols of one letter, and elements are represented by symbols of two letters.

c)

Elements are pure substances, and compounds are not.

d)

Elements are always larger units of matter, and compounds are smaller.

55.

How many elements are in the compound Fe2O3?

a)

0

b)

1

c)

2

d)

3

56.

Water is made up of hydrogen and oxygen, two elements that were chemically combined. This makes water a(n)

a)

atom

b)

compound

c)

element

d)

mixture

57.

Which of the following is a heterogenous mixture?

a)

neon

b)

soil

c)

steel

d)

salt water

58.

Table Salt (NaCl)

a)

element

b)

compound

c)

mixture

59.

Copper (Cu)

a)

element

b)

compound

c)

mixture

60.

Salad

a)

element

b)

compound

c)

mixture

61.

Baking Soda (NaHCO₃)

a)

element

b)

compound

c)

mixture

62.

The smallest particle of an element; the smallest unit of matter.

a)

atom

b)

element

c)

compound

d)

mixture

63.
These contain only one kind of atom. 
a)
element 
b)
compound 
c)
mixture 
d)
water 
64.
The air is a _________. 
a)
element 
b)
mixture 
c)
compound 
d)
energy 
65.
These are mixtures that are the same throughout. 
a)
homogeneous mixtures 
b)
heterogeneous mixtures 
c)
mixed mixtures 
66.
These are mixtures that are not the same throughout. 
a)
homogeneous mixtures 
b)
heterogeneous mixtures 
c)
solutions 
d)
water 
67.
Milk is a ________
a)
compound 
b)
mixture 
c)
element 
68.
This can be separated physically. 
a)
mixture 
b)
element 
c)
compound 
69.
Sand at the beach is a _______. 
a)
homogeneous mixture 
b)
heterogeneous mixture 
c)
compound 
d)
element 
70.

gold, Au, is an example of a(n)

a)

element

b)

compound

c)

mixture

71.

Kool-aid is a example of a(n)

a)

element

b)

compound

c)

mixture

72.

Examples are diamonds (C) and Uranium (U)

a)

elements

b)

mixtures

c)

compounds

73.
Is sugar (C12H22O11) an element or a compound?
a)
Element
b)
Compound
74.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
75.
You are eating a pizza. What type of mixture are you consuming?
a)
homogeneous
b)
heterogeneous
c)
pure substance
d)
The Periodic Table
76.
This contains a variety elements and compounds that ARE NOT chemically combined.
a)
Water
b)
Mixture
c)
Elements
d)
Compounds
77.
Italian Salad Dressing is a . . .
a)
heterogeneous mixture
b)
homogeneous mixture
c)
Pure Substance
d)
Compound
78.
Which of the following is an element?
a)
Sugar
b)
Salt
c)
Water
d)
Oxygen
79.

A physical change...

a)

changes the physical properties of an object, but does not create a new substance.

b)

creates a new substance and cannot be undone.

80.

A chemical change

a)

changes the physical properties of an object, but does not create a new substance.

b)

creates a new substance and cannot be undone.

81.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

82.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

83.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

84.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

85.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

86.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

87.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

88.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

89.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

90.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

91.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

92.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

93.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

94.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

95.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

96.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

97.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

98.

Is this an example of a physical or chemical change?

a)

physical

b)

change

99.
How many nitrogen atoms in 
Mg(NO3)2
a)
1
b)
2
c)
3
d)
6
100.
How many magnesium atoms in 
Mg(NO3)2
a)
1
b)
2
c)
3
d)
6
101.
How many oxygen atoms in 
Mg(NO3)2
a)
1
b)
2
c)
3
d)
6
102.
How many nitrogen atoms are in 
(NH4)3PO4
a)
1
b)
4
c)
3
d)
12
103.

What does pH measure?

a)

the amount of hydrogen (H+) ions

b)

the amount of hydroxide (OH-) ions

c)

amount of water

d)

all of the above

104.

Which of the following is the strongest acid?

a)

1

b)

5

c)

3

d)

8

105.

Which of the following is the strongest base?

a)

4

b)

14

c)

7

d)

15

106.

Which of the following is a characteristic of a base?

a)

bitter

b)

sour

c)

corrosive

d)

releases hydrogen ions in water

107.

Which of the following is a characteristic of an acid?

a)

bitter

b)

slippery

c)

sour

d)

releases hydroxide ions in water

108.

A substance with a pH of 8 is...

a)

a weak base

b)

a weak acid

c)

a strong base

d)

a strong acid

109.

A substance with a pH of 7 is which of the following?

a)

acid

b)

base

c)

neutral

110.

A substance with a pH of 5 is which of the following?

a)

acid

b)

base

c)

neutral

111.

A substance with a pH of 11 is which of the following?

a)

acid

b)

base

c)

neutral

112.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
113.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
114.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
115.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
116.

ductile means...

a)

can be made into wire

b)

can be bent or hammered

c)

can light up a light bulb

d)

it's shiny

117.
Which of the following is a physical characteristic of a metal?
a)
texture
b)
malleable
c)
brittle
d)
semi-conductor
118.
Which of the following is a physical characteristic of a metalloid?
a)
texture
b)
malleable
c)
brittle
d)
semi-conductor
119.
An element has properties of BOTH metals and nonmetals. WHERE would it be found in the periodic table? 
a)
To the right 
b)
To the left 
c)
on the zig zag line
120.
What does luster mean?
a)
Breaks into pieces
b)
can be hammered into thin sheets
c)
No shine
d)
reflects light, shiny 
121.
What does brittle mean?
a)
Breaks into pieces
b)
can be hammered into thin sheets
c)
No shine
d)
reflects light shiny 
122.
´Elizabeth was examining elements and their physical properties. She described an element is her science journal as having no shine, an insulator, and  very brittle. What would this element be a metal, nonmetal, or metalloid?
a)
metal 
b)
nonmetal 
c)
metalloid
123.
Can be found on the periodic table
a)
Element
b)
Compound
c)
MIxture
124.
When two or more elements chemically combine
a)
element
b)
compound
c)
mixture
d)
solution
125.

Which item on this element square is the chemical symbol?

a)

Copper

b)

29

c)

Cu

d)

63.546

126.

Select the correct definition for MASS

a)

A measure of the amount of matter in an object

b)

A measure of the amount of space an object takes up

c)

A property that describes the compactness of molecules in a substance

127.

Select the correct definition for DENSITY

a)

A measure of the amount of matter in an object

b)

A measure of the amount of space an object takes up

c)

A property that describes the compactness of molecules in a substance (describes the mass in a given volume)

128.

Which phase in the image is the LEAST DENSE?

a)

Solid

b)

Liquid

c)

Gas

129.

Which statement below is true about Cube A and Cube B?

a)

Cube A has more mass

b)

Cube A is more dense

c)

Cube B is more dense

130.

In this image, a ping pong ball is floating in water. Select all correct statements.

a)

The ping pong is less dense than the water

b)

The water is less dense than the ping pong

c)

If the ping pong ball was bigger, it would eventually sink

131.

Which material is MOST dense?

a)

A

b)

B

c)

C

132.
Which liquid is the least dense?
a)
oil
b)
water
c)
syrup 
d)
plastic bottle
133.
Which liquid is the most dense?  
a)
oil
b)
water
c)
syrup
d)
plastic bottle
134.
What is the volume of Object X?
a)
10.0 cm3
b)
15.0 cm3
c)
20.0 cm3
d)
25.0 cm3
135.
What is the density of an object with a mass of 60 g and a volume of 2 cm3?
a)
30 g/cm3
b)
62 g/cm3
c)
120 g/cm3
d)
0.033 g/cm3
136.

Select the correct definition for VOLUME

a)

A measure of the amount of matter in an object

b)

A measure of the amount of space an object takes up

c)

A property that describes the compactness of molecules in a substance

137.

The image shows 12 aluminum cylinders, different sizes. Which statement below is correct?

a)

They all have the same mass and same volume

b)

Because they are all the same material, they all have the same density.

c)

They all have different densities. The larger the cylinder, the greater the density.

138.

The image shows a block of wood cut in half. Select all true statements each new piece.  

a)

Because they are half the mass and volume of the original block, each new piece is half the density.

b)

Because they are all the same material, each cut piece is the same density as the original block.

139.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
140.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
141.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

142.

A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?

a)

The heat caused the chemical to become less dense.

b)

The reaction gave off more heat than was added.

c)

Some of the lighter particles were destroyed.

d)

Some of the particles escaped as a gas formed.

143.

A student measures the mass of an iron nail to be 25 grams. The student heats the nail over a bunsen burner and measures the mass of the nail afterwards. The mass of the nail is found to be greater after burning. Which of the following best explains the increase in mass of the nail?

a)

The heat caused the compound to become more dense.

b)

The reaction gave off less heat than was added.

c)

Some of the heavier particles multiplied inside the nail.

d)

Extra particles from the air were added to the nail during burning.

144.
What are the products of photosynthesis?
a)
water and carbon dioxide
b)
oxygen and glucose
c)
oxygen and carbon dioxide
d)
oxygen and water
145.
Which gas is removed from the atmosphere during photosynthesis?
a)
hydrogen
b)
oxygen
c)
nitrogen
d)
carbon dioxide
146.
Which of the following go through the process of photosynthesis?
a)
bees
b)
algae
c)
humans
d)
mushrooms
147.
What molecule absorbs sunlight for photosynthesis?
a)
chloroplast
b)
thylakoid
c)
grana
d)
chlorophyll
148.
Which statement about photosynthesis is correct?
a)
Plants get the energy they need for photosynthesis from water.
b)
Plants get the energy they need for photosynthesis from soil.
c)
Plants get the energy they need for photosynthesis from sunlight.
d)
Plants do not require energy to perform photosynthesis.
149.
The main source of energy for all life comes from ____.
a)
the Earth
b)
the moon
c)
the sun
d)
the food we eat/make
150.
Which of the following is not needed for photosynthesis to occur?
a)
sunlight
b)
carbon dioxide
c)
water
d)
oxygen
151.
What is the chemical formula for glucose?
a)
C6H12O6
b)
C6H6O12
c)
C12H6O12
d)
C6O2H6
152.
What is the chemical formula for water?
a)
H2O
b)
HO2
c)
CHO2
d)
CO2H
153.
What is the chemical formula for carbon dioxide?
a)
H2O
b)
CO2
c)
CHO2
d)
CO2H
154.
What is the chemical formula for oxygen?
a)
H12O2
b)
C6O2
c)
O3
d)
O2
155.

Why are plants usually green?

a)

Because the chlorophyll reflects green light

b)

Because the chlorophyll absorbs green light

c)

Because the accessory pigments combine to make green

d)

Because the accessory pigments only absorb green light

156.
Which choice correctly shows the gases that enter and exit plants during photosynthesis?
a)
Enter: Oxygen
Exit: Carbon dioxide
b)
Enter: Water vapor
Exit: Glucose
c)
Enter: Carbon dioxide
Exit: Oxygen
d)
Enter: Light
Exit: Water vapor
157.
After photosynthesis, plants store their energy as _________ .
a)
chlorophyll
b)
pigment
c)
glucose (sugar)
d)
Oxygen
158.
Which of the following is the correct equation for PHOTOSYNTHESIS?
a)
CO2 + light + H2O --> O2 + Sugar
b)
CO2 + sugar + H2O --> O2 + light
c)
O2 + light + H2O --> CO2 + Sugar
d)
CO2 + O2 + H2O --> Light+ Sugar

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