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7th Grade Honors Science 1st Semester Review

Total questions: 75

Worksheet time: 6hrs 15mins

Name
Class
Date
1.

A physical change is

a)

a change where the characteristics do not change the substance

b)

a change where the characteristics do change the substance

c)

a change where the chemistry changes

2.

A new substance is formed in a physical change.

a)

true

b)

false

3.

How do you know that rusting is a chemical change?

a)

it changes color

b)

atoms were rearranged to form a new substance

c)

we just know

d)

the rust

4.

The following are examples of evidence of a chemical reaction....

a)

ice melting into a liquid

b)

condensation

c)

endothermic reaction

d)

change in color, production of gas bubbles

5.
Which Law states that Matter cannot be created or destroyed during a Chemical Change/Reaction?
a)
Conservation of Energy
b)
Conservation of Matter (Mass)
c)
Conservation of Momentum
d)
Conservation of Thermodynamics
6.

How many elements are in this chemical formula?

H2SO4H_2SO_4  

a)

1

b)

2

c)

3

d)

4

7.

What is the total number of atoms in this formula? H2O2H_2O_2  

a)

2

b)

4

c)

3

8.

Is this an element or a compound? CaSO4CaSO_4  

a)

Element

b)

Compound

9.

What is the total number of atoms in this chemical formula? C8H3NaBr12C_8H_3NaBr_{12}  

a)

18

b)

12

c)

25

d)

24

10.

How many elements are in this chemical formula? NaHCO3NaHCO_3  

a)

1

b)

2

c)

3

d)

4

11.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
12.
2H2 + O2 --------> 2H2O What  are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
13.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
14.

Is this equation balanced?

a)

Yes, everything appears the same amount on each side.

b)

No, there are too many hydrogen on the left side.

c)

No, there are too many oxygen on the left side.

15.

Is this equation balanced?

a)

Yes, everything appears the same amount on each side.

b)

No, there are too many hydrogen on the left side.

c)

No, there are too many oxygen on the left side.

16.

Is this equation balanced?

a)

Yes, everything appears the same amount on each side.

b)

No, there are too many copper on the left side.

c)

No, there are too many oxygen on the left side.

17.

Identify if the following equation is unbalanced or balanced.

O3+2C→3OC

a)

Unbalanced

b)

Balanced

18.

What law is best described

a)

1st

b)

2nd

c)

3rd

d)

law of motion

19.

What law is best described

A magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them.

a)

Newton's 1st Law

b)

Newton's 2nd Law

c)

Newton's 3rd Law

20.
What is Newton's First Law
a)
F=ma
b)
Every action has an equal and opposite reaction
c)
An object at rest stays at rest, an object in motion stays in motion. 
d)
Friction 
21.
Newton's third law states that any action will have a(n) _______ and ______ reaction
a)
Equal and similar
b)
Equal and opposite
c)
Equal and different
d)
Greater and opposite
22.
It takes more force to accelerate the iron man on the left than the iron man on the right because the iron man on the left has more mass. This best describes
a)
Newton's first law, the law of inertia
b)
Newton's second law, the law of acceleration
c)
Newton's third law, the law of action reaction 
d)
The law of universal gravitation
23.

one that causes a change in the motion of the object to which the force is applied

a)

Action/Reaction

b)

Unbalanced Force

c)

Acceleration

24.

This equation goes with which law?

a)

Newton's first law of motion

b)

Newton's second law of motion

c)

Newton's third law of motion

25.
Conduction can only occur between two objects when –
a)
one object is less dense than the other.
b)
both objects are in physical contact with each other.
c)
one of the objects is made of a metal.
d)
both objects are exactly the same temperature.
26.

In the situation illustrated, how will heat energy move? Heat energy will be transferred from –

a)

the hot plate to the water by conduction

b)

the water to the hot plate by conduction.

27.
Radiation is a method of thermal energy transfer that moves -
a)
through empty space.
b)
when objects touch.
c)
only through solids.
d)
in the motion of fluids.
28.
Heat transfer in boiling water.
a)
Conduction
b)
Convection
c)
Radiation
29.
On a cold rainy day a baby is touching a cold window.  It feels so cold. Which way is the heat moving moving? 
a)
Cold is moving from the window to the hand.
b)
Heat is moving from the hand to the window.
c)
Heat doesn't move.
d)
It moves in currents
30.
Heat transfers from an area of ____temperature to an area of ___ temperature.
a)
high to low
b)
low to high
c)
high to high
d)
It can travel high to low and low to high. 
31.
What does this graph represent?
a)
Constant Speed
b)
Acceleration
c)
Not moving
32.
What does this graph represent?
a)
Constant speed
b)
Acceleration
c)
Not moving
33.

Match the description to the graph:

"The car is traveling at a constant speed."

a)
b)
c)
34.

Match the description to the graph:

"The car is coming back."

a)
b)
c)
d)
35.

Segment A-B The bus is _________________.

a)

at rest

b)

returning (to original position)

c)

moving forward

36.

What are mixtures?

a)

Substances that cannot be separated into their components

b)

Pure substances that do not contain any other materials

c)

Combinations of substances that can sometimes be separated into their components

d)

Elements found only in a laboratory setting

37.

What do we call substances that are not mixtures?

a)

Compounds

b)

Elements

c)

Pure

d)

Solutions

38.

What is a pure substance?

a)

A combination of different types of particles.

b)

A substance that can be physically separated into simpler substances.

c)

A substance that contains only one type of thing.

d)

Parts of a mixture.

39.

Based on the diagram, what type of substance is represented in item 8?

a)

Mixture

b)

Pure Substance

c)

Compound

d)

Element

40.

Based on the diagram, what type of substance is represented in item 9?

a)

Mixture

b)

Pure Substance

c)

Solution

d)

Heterogeneous mixture

41.

Based on the diagram, what type of substance is represented in item 10?

a)

Mixture

b)

Pure Substance

c)

Solvent

d)

Solute

42.

What can mixtures be made from?

a)

Only solids

b)

Only liquids

c)

Any combination of solids, liquids, and gases

d)

Only gases

43.

This is a type of mixture where one substance dissolves into another

a)

Solution

b)

Miscibility

c)

Compound

d)

Solubility

44.

The substance that does the dissolving

a)

Solute

b)

Solvent

c)

Solution

d)

Miscibility

45.

The substance getting dissolved

a)

Solvent

b)

Solute

c)

Solution

d)

Mixture

46.

If I want more sugar to dissolve in water, I should stir the water

a)

true

b)

false

47.

If I want more sugar to dissolve in water, I should heat the water

a)

true

b)

false

48.
Chicken soup is an example of what kind of substance?
a)

homogeneous mixture

b)
solution
c)
heterogeneous mixture
d)
compound
49.
Sugar water
a)
Heterogeneous
b)
Homogeneous
50.
When water is added to a solution it is called a ______________
a)
dilution
b)
concentration
c)
heterogeneous solution
d)
dissociation
51.

You can make a solution more concentrated by adding more __________.

a)
solute
b)
solvent
c)
water
d)

solution

52.

Acids typically taste

a)

sour

b)

sweet

c)

both

53.
Feels slippery.
a)
Acids
b)
Bases
c)
All
54.
Tastes bitter.
a)
Acids
b)
Bases
c)
Salts
d)
All
55.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
56.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
57.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
58.
Bleach is a strong base, what is the pH level of bleach?
a)
13
b)
14
c)
1
d)
2
59.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
60.
A solution with a pH of 3.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
61.

A student constructs a table of distances and times. Using the data, which section of the table represents the highest average speed?

a)

Section A

b)

Section B

c)

Section C

d)

Section F

62.

A train travels 800 kilometers in 6 hours. What is the average speed of the train?

a)

150 km/h

b)

133 km/h

c)

806 km/h

d)

4,800 km/h

63.

A train travels at a speed of 70 kilometers per hour for 3 hours, and a car travels 80 kilometers per hour for 2 hours. Which of the two vehicles travels farther?

a)

The car travels farther because it travels 210 kilometers

b)

The train travels farther because it travels 160 kilometers

c)

The car travels farther because it travels at a faster speed

d)

The train travels farther because it travels 210 kilometers

64.

A man travels 25 kilometers in 15 minutes. A police officer stops him and writes a ticket for speeding. The posted speed limit is 80 kilometers per hour. Did the man exceed the posted speed limit?

a)

No, he was traveling at a speed of 25 km/h

b)

No, he was traveling at a speed less than 80 km/h

c)

Yes, he was traveling at a speed of 100 km/h

d)

Yes, traveling at a speed of 80 km/h is too fast for travel safety

65.

Which change to speed would convert a speed measurement to velocity?

a)

Adding direction

b)

Slowing down

c)

Speeding up

d)

Maintaining constant speed

66.

Which statement describes the velocity of the apple?

a)

The apple moved a distance of 6 meters in 3 seconds

b)

The velocity of the apple was constant at 2 m/s

c)

The speed of the apple did not change

d)

The apple fell in a downward motion at an average speed of 2 m/s

67.

A car has a net force of 200 N acting on it, therefore it will _________________.

a)

Accelerate

b)

Move at a Constant Speed

68.
If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration?  (F=ma)
a)
The one with a mass of .78 kg will have the greatest acceleration.
b)
The one with a mass of .52 kg will have the greatest acceleration.
c)
They will both accelerate at the same rate.
69.
A 20 kg bike accelerates at 10 m/s2.  what was the force?
a)
25 Newtons
b)
20 Newtons
c)
200 Newtons
d)
10 Newtons
70.
A skier needs to apply a force of 132 N to accelerate at a rate of 2 m/s2. What is the mass of the skier? To solve this problem you must do - 
a)
132 ÷ 2
b)
2 ÷ 132
c)
132 x 2
71.
A skier needs to apply a force of 132 N to accelerate at a rate of 2 m/s2. What is the mass of the skier? The answer to this question is most likely (HINT: Look at the units!!!) - 
a)
66 N
b)
66 m/s2
c)
66 kg
72.
A 5 kg block is pulled across a table by a net force of 32 N. Calculate the acceleration of the object. To solve this problem you must do - 
a)
32 ÷ 5
b)
5 ÷ 32
c)
32 x 5
73.
A force of 90N is applied to each cart below, which one will accelerate the fastest?
a)
Cart 1
b)
Cart 2
c)
Cart 3 
d)
Cart 4
74.

Mass = 10 kg. a = 10 ms2. Calculate the force.

a)

10N

b)

100N

c)

1 N

d)

1000N

75.

Force = 20 N and Mass = 4 kg. Calculate the acceleration.

a)

80 N

b)

80 ms-2

c)

5 ms-2

d)

0.2 ms-2

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