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District MOY Review - 8th Grade Science

Total questions: 110

Worksheet time: 1hrs 23mins

Name
Class
Date
1.

Three liquids and two solids are placed in a graduated cylinder. The substances arrange themselves in the cylinder according to their densities. Use the information to identify the liquids and solids in the graduated cylinder. start with the Most dense thing as substance 1, and continue from there.

a)

Gold

b)

Mercury

c)

water

d)

Gasoline

e)

Cork

1)
2)
3)
4)
5)
2.

Calculate the density of the cube.

a)

2 g/cm3

b)

4 g/cm3

c)

6 g/cm3

d)

8 g/cm3

3.
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
4.

An irregularly shaped rock was lowered into a graduated cylinder holding a volume of water equal to 50 ml. The height of the water rose to 75 ml. If the mass of the stone was 250 g, what was its density?

a)

15 g/mL

b)

3.3 g/mL

c)

10 g/mL

d)

20 g/mL

5.

Match the following

a)

a substance that consists of just one type of atom

1.

element

b)

a small particle that is a building block of matter

2.

atom

c)

a combination of two or more substances physically blended together

3.

mixture

d)

anything that has mass and takes up space

4.

matter

6.

Icing is a/an

a)

element

b)

heterogenous mixture

c)

homogenous mixture

d)

solution

7.

Salsa is an example of a/an

a)

compound

b)

homogeneous mixture

c)

heterogeneous mixture

d)

solution

8.

Mercury is a/an _.

a)

element

b)

heterogeneous mixture

c)

homogeneous mixture

d)

compound

9.

This shape diagram represents a/an:

a)

element

b)

compound

c)

homogeneous mixture

d)

heterogeneous mixture

10.

Which of the following is a pure substance?

a)

b)

c)

d)

11.

Classify the image.

a)

Mixture of compounds and elements

b)

Mixture of compounds.

c)

Mixture of elements.

d)

Element

12.

The shape diagram represents a

a)

compound

b)

homogeneous mixture

c)

heterogeneous mixture

d)

element

13.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

14.

Which one is the coefficient 4H2O?

a)

4

b)

H

c)

2

d)

O

15.

How many Elements are in the compound C2H8O

a)

2

b)

3

c)

1

16.

How many Hydrogen (H) atoms in 3(NH₄)₂CrO₄?

a)

4

b)

2

c)

8

d)

24

17.
2H2 + O2 --------> 2H2O What  are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
18.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

19.

How many Hydrogen atoms are present in 4 MOLECULES of C6H4MgK5

a)

4

b)

8

c)

16

d)

1

20.

How many TOTAL atoms are there in 3 MOLECULES of H2O

a)

6

b)

9

c)

3

d)

12

21.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
22.
Identify the reactant(s) and product(s) of the reaction.
a)
All three are reactants and none are products.
b)
Hydrogen and water are the reactants, and oxygen is the product.
c)
Water and oxygen are the reactants, and hydrogen is the product.
d)
Hydrogen and oxygen are the reactants, and water is the product.
23.
A molecule is________
a)
a glob of gelatinous goo
b)
smaller than an atom
c)
filled with raisons
d)
more than one atom bonded together
24.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
25.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
26.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
27.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
rust
28.
Change in color is a physical change.
a)
True
b)
False
29.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
30.

 

Which is an example of a physical

change?

a)

a candle burning

b)

baking a cake

c)

evaporating water

d)

metal rusting

31.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
rust
32.
Curling your hair
a)
Chemical Change
b)
Physical Change
33.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
34.

A green powder is heated & a gas is given off while it turns to a black solid. This describes

a)

Physical Change

b)

Chemical Change

c)

Change in State

d)

Change in Temperature

35.

Manganese is shiny, conducts heat and electricity, and can be hammered into thin sheets. What is is?

a)

Nonmetal

b)

Metal

c)

Metalloid

d)

None of the above

36.

This word is used to describe a substance that breaks apart easily and is weak and fragile

a)

Conductivity

b)

Ductile

c)

Malleable

d)

Brittle

37.

Silicon has a dull, metallic luster, conducts heat well, and is brittle. What is it?

a)

Nonmetal

b)

Metal

c)

Metalloid

d)

None of the above

38.

Where are the nonmetals located on the Periodic Table?

a)

On the right

b)

On the left

c)

On the stairstep

39.

Where are the metalloids located on the Periodic Table?

a)

On the right

b)

On the left

c)

On the stairsteps

40.

Gold is an element that is often used to make necklaces, rings, and other types of jewelry. What property of gold makes it useful in this way?

a)

Gold is a conductor

b)

Gold is an insulator

c)

Gold is malleable

d)

Gold has a high melting point

41.

Use your Periodic Table to help you. Boron would be classified as a...

a)

Metal

b)

Nonmetal

c)

Metalloid

42.

Metals are shiny, good conductors, malleable, and ductile.

a)

True

b)

False

43.

Metalloids have the same properties as

a)

metals.

b)

nonmetals.

c)

neither, they are a combination of both.

44.

Metals are mostly found on which side of the periodic table?

a)

Left

b)

Right

45.
Which of the following is NOT a characteristic of most metals?
a)
Brittle
b)
Good conductor
c)
Ductile
d)
Malleable
46.

Copper is a common metal. Which of the following properties does this metal most likely have?

a)

High conductivity, high malleability, and low luster

b)

Low conductivity, low malleability, and low luster

c)

High conductivity, high malleability, and high luster

d)

Low conductivity, high malleability, and high luster

47.
What two elements make up water?
a)
Helium and oxygen
b)
Hydrogen and oxygen
c)
helium and carbon
d)
oxygen and carbon
48.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
49.
Why does ice float?
a)
As water freezes, it expands and its density decreases.
b)
As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
c)
As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
d)
As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
50.
Water is a universal solvent because it...
a)
It can be found anywhere
b)
It freezes when it gets cold
c)
floats when frozen
d)
Dissolves most substances
51.

What characteristic is shown in the image?

a)

Polarity

b)

Hydrogen Bonds

c)

Cohesion

d)

Adhesion

52.
Why does water move from the roots to the leaves of plants?
a)
Water is pushed by solutes
b)
Capillary action pulls the water molecules like a chain
c)
Water is pulled by gravity
d)
Water’s cohesion causes it to “pull” towards the leaves
53.
Paper clips are able to float on water because of ....
a)
adhesion
b)
capillary action
c)
surface tension
d)
universal solvent
54.

Refer to the picture of water sticking to a leaf; this is occurring because of:

a)

Adhesion

b)

Cohesion

55.

Another name for an alkaline substance is a(n) ________.

a)

Acid

b)

Base

c)

Covalent bond

d)

Solution

56.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
57.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
58.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
59.

A base is a substance

a)

That releases OH- ions when dissolved in water

b)

That releases H+ ions when dissolved in water

c)

Does not release any ions when dissolved in water

d)

None of the above

60.
If you have a substance with a pH of 7.1 it is a(n).....
a)
Acid
b)
base
61.

Water has a neutral because

a)

it has more H+ ions than OH-

b)

it has more OH- ions than H+

c)

it does not produce any ions

d)

it has an equal amount of H+ and OH- in solution

62.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
63.
Bleach is a strong base, what is the pH level of bleach?
a)
13
b)
14
c)
1
d)
2
64.

Speed = _______________

a)

Distance + time

b)

Distance – time

c)

Distance x time

d)

Distance / time

65.

This occurs when an object speeds up, slows down, or changes direction.

a)

Speed

b)

Velocity

c)

Acceleration

66.

Another way to explain the speed and direction of a object would be to describe it’s ________

a)

Speed

b)

Velocity

c)

Acceleration

67.

Velocity = _______________

a)

Speed – direction

b)

Speed + direction

c)

Speed x direction

d)

Speed / direction

68.

At what speed would a car have to move in order to travel 20 kilometers in 2 hours.

a)

5 km/hr

b)

10 km/hr

c)

20 km/hr

d)

40 km/hr

69.
Changes in our speed, direction or both are called _________.
a)
gravity
b)
changes
c)
acceleration
d)
displacement
70.
You ride your bike around the block at a constant speed of 11 km/h.
a)
Acceleration occurred because speed increased.
b)
Acceleration occurred because speed decreased.
c)
Acceleration occurred because you changed directions.
71.
A measurement of how fast an object is moving
a)
Velocity
b)
Speed
c)
Vector
d)
Acceleration
72.

A car initially traveling at 8.0 meters per second doubles its speed while traveling in a northeast direction.

Students used a table to record the initial and final conditions for speed and velocity.

Which table is correct?

a)

b)

c)

d)

73.

Which statement best describes the motion of the toy vehicle during the first 30 seconds of the investigation?

a)

The vehicle was traveling at a constant speed

b)

The vehicle was accelerating at a constant rate

c)

The speed of the vehicle was increasing

d)

The acceleration of the vehicle was increasing

74.

Which statement best describes the cart?

a)

The cart was stationary with a velocity of 0 m/s for the entire 7 seconds

b)

The cart was stationary except for a short burst of acceleration of 0.5 m/s2

c)

The cart moved at a constant velocity of 0.5 m/s for the entire 7 seconds

d)

The cart accelerated at a constant rate of approximately 0.8 m/s2

75.

Match the following

a)

Speed

1.

30 m/s

b)

Velocity

2.

30 m/s east

c)

Acceleration

3.

30 m/s2

76.

The pickup truck has a changing velocity because the pickup truck -

a)

can accelerate faster than the other two vehicles

b)

is traveling in the opposite direction from the other two vehicles

c)

is traveling on a curve in the road

d)

needs a large amount of force to move

77.

How will this object move?

a)

It will not move

b)

It will move in both directions

c)

It will move to the right

d)

It will move to the left

78.

Shadell pushes a box 35 N to the right. Nazai pushes the box 25 N in the same direction. What is the net force?

a)

60 N balanced to the right

b)

10 N balanced to the right

c)

60 N unbalanced to the right

d)

10 N unbalanced to the right

79.

What is net force?

a)

10 N left

b)

0 N

c)

10 N right

80.

Balanced or Unbalanced

(a)  

81.

What is the net force?

a)

30 N left

b)

25 N right

c)

55 N right

d)

5 N left

82.

Which of the answer choices is not a characteristic of a balanced force?

a)

no change in motion

b)

moving at a constant speed

c)

causes a change in motion

d)

net force of zero

83.

What is the net force?

a)

0 balanced

b)

900 N balanced right

c)

900 N unbalanced right

d)

0 unbalanced

84.

What is the net force?

a)

30 N left

b)

25 N right

c)

55 N right

d)

5 N left

85.

States that force equals mass x acceleration

a)

Newtons 1st law

b)

Newtons 2nd law

c)

Newtons 3rd law

86.

Claims if an object exerts a force on another object, the second object exerts a force of equal strenght in the opposite direction back towards the first object

a)

Newtons 1st law

b)

Newtons 2nd law

c)

Newtons 3rd law

87.

States an object at rest will remain at rest unless acted on by an unbalanced force

a)

Newtons 1st law

b)

Newtons 2nd law

c)

Newtons 3rd law

88.

A 1,000-kg truck barrels down a highway at 24 m/s2 with a force of 24,000 N.

a)

Newtons 1st law

b)

Newtons 2nd law

c)

Newtons 3rd law

89.

A trampoline pad launches a child upwards with a force equal to the downward force of the landing the moment before.

a)

Newtons 1st law

b)

Newtons 2nd law

c)

Newtons 3rd law

90.

(Using Fnet=ma), What net force is required to accelerate a car at a rate of 2 m/s2 if the car has a mass of 3,000 kg?

a)

6,000 N

b)

1,500 N

c)

3,002 N

d)

2,998 N

91.

Maya was riding her 20 kg bike and she accelerated at 10 m/s2 to catch up with Noah and Elijah. What was the sum of all the force vectors acting on Maya's bike?

a)

25 Newtons

b)

20 Newtons

c)

200 Newtons

d)

10 Newtons

92.

a)

Jessica ran all the way from school to home going the same constant speed and never stopping.

b)

Jessica waited around after school for her friend, and then they ran home together.

c)

Jessica ran for a long time, then slowed down to walk the rest of her trip. Once she got home, she sat down on the couch.

d)

Jessica walked for a while, stopped to sit on a bench in the park, and then ran the rest of the way home.

93.
What was the speed of the train between 0 and 4 hours?
a)
1 km/h
b)
10 km/h
c)
100 km/h
d)
100 h/km
94.
What is the line on this graph showing?
a)
moving away from starting point at a constant speed
b)
moving back towards the starting point at a constant speed
c)
acceleration (getting faster)
d)
deceleration (getting slower)
95.
What does this graph represent?
a)
Constant speed
b)
Acceleration
c)
Not moving
96.

The Big Bang Theory explains…

a)

Origins of the universe

b)

The beginning of life

c)

The law of gravity

d)

Why the universe was created

97.

A galaxy that is moving toward the Earth will show…

a)

A decrease in brightness

b)

A blue shift in the spectrum

c)

An increase in light years

d)

A red shift in the spectrum

98.

What does the Big Bang Theory say?

a)

The universe was created in its current location

b)

The universe is collapsing and getting smaller

c)

All of the matter in the universe is expanding from a tiny, dense point

d)

Two galaxies collided causing a big bang

99.

Which of the following is evidence of the Big Bang Theory?

a)

The universe is getting smaller

b)

Cavemen heard a loud bang at the

beginning of time

c)

The universe is expanding

d)

The universe isn’t moving

100.

In redshift, the wavelengths of light become

a)

Longer

b)

Faster

c)

Shorter

d)

Bluer

101.

The farther away a galaxy is, _________ is moving.

a)

slower

b)

faster

102.

What is the universe?

a)

All the substance in the solar system

b)

All the substance in our galaxy

c)

Everything that exists

d)

The earth and moon together

103.

Scientists have detected a cosmic microwave background radiation or CMBR. This is received from all parts of the universe and is thought to be the heat and light left over from the original explosion.

a)

true

b)

false

104.

What does redshift tell us?

a)

Red things get hotter

b)

The object is moving towards us

c)

The object is moving away from us

d)

The object isn't moving away from us

105.

Why is the light from distant galaxies red shifted?

a)

They produce more red light than nearby galaxies

b)

The longer wavelengths are filtered out by dust

c)

Light in outer space is red

d)

They are moving away from us

106.

How are the stars on the HR diagram plotted?

a)

Size & Density

b)

Temperature & Luminosity

c)

Age & Luminosity

d)

Temperature & Size

107.
Blue stars are the _____________.
a)
hottest
b)
coolest
c)
smallest
108.

Which star is considered a main sequence star?

a)

Vega

b)

Betelgeuse

c)

Pollux

d)

Van Maanan's Star

109.

Which star is considered a giant star?

a)

Mira

b)

Zeta Arindani

c)

Barnard's Star

d)

Betelgeuse

110.

Which star is considered a supergiant?

a)

Sirius B

b)

Sun

c)

Betelgeuse

d)

Van Maanan's Star

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