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CA#2 Review

Total questions: 40

Worksheet time: 1hrs 12mins

Name
Class
Date
1.

2 CH2CO3OH

Number of C: ​ (a)  

Number of H: ​ (b)  

Number of O: ​ (c)  

Choose from the below words
4
6
8
2
3
1
5
7
9
10
2.

How many O's are in Al₂(SO₄)₃

(a)  

3.

Match the element to the number of atoms it has.

2 Al(C2H3O4)2

a)

aluminum

1.

2

b)

carbon

2.

8

c)

hydrogen

3.

12

d)

oxygen

4.

16

4.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
5.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
6.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
7.
How many Chlorine are in MgCl2?
a)
2
b)
1
c)
3
8.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
9.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
10.

Match the element to the number of atoms it has.

2 Al(C2H3O4)2

a)

aluminum

1.

2

b)

carbon

2.

8

c)

hydrogen

3.

12

d)

oxygen

4.

16

11.

What elements are represented in this chemical formula? Fe2O3Fe_2O_3  

a)

Iron, Oxygen

b)

Francium, Europium, Oxygen

c)

Ferrium, Oxygen

d)

Berylium, Oxygen

12.

Match the formula to the description:

a)

SO3

1.

1 sulfur, 3 oxygen's

b)

2 SO3

2.

2 sulfur's, 6 oxygen's

c)

2 S2O3

3.

4 sulfur's, 6 oxygen's

d)

3 SO4

4.

3 sulfur's, 12 oxygen's

e)

SO4

5.

1 sulfur, 4 oxygen's

13.

4CF2Cl3

a)

carbon

1.

4

b)

fluorine

2.

8

c)

chlorine

3.

12

14.

Put the elements in order from smallest to largest number of atoms:

2 C3H5(NO3)4

a)

carbon

b)

nitrogen

c)

hydrogen

d)

oxygen

1)
2)
3)
4)
15.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
16.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
17.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
18.

How many elements are present in this compound? (Careful!)

Mg2As3COHNi2

a)

2

b)

4

c)

6

d)

10

19.

Students mixed two clear liquids in a beaker and found that small, solid particles formed and settled at the bottom. What evidence proves that a chemical reaction occured?

a)

The shape changed

b)

The volume changed

c)

The two liquids mixed into a solution

d)

The two liquids form a new substance

20.

Why is dissolving sugar in water a physical change?

a)

The sugar can evaporate

b)

The sugar will be left behind

c)

Sugar can dissolve faster if stirred

d)

Sugar mixed with water creates a new substance

21.

When a new substance is formed with different properties than the original substance it is called a...

a)

Chemical change

b)

Physical change

c)

Change in State

d)

Change in appearance only.

22.

What happens to a piece of metal that rusts because it was left out in the rain?

a)

the atoms combined in the metal due to a chemical reaction

b)

the atoms rearranged in the metal due to a chemical reaction

c)

the atoms overheated in the metal due to a chemical reaction

d)

the atoms broke apart in the metal due to a chemical reaction

23.
WHY is burning a campfire a chemical change? 
a)
It created a new substance with new properties
b)
It changes in size 
c)
There is a lot of smoke
d)
The logs get smaller 
24.
What is a PRECIPITATE?
a)
When it rains.
b)
When a solid forms after 2 liquids mix and react. 
c)
When a solid forms after steam is produced. 
d)
When a solid forms after a liquid freezes. 
25.

Four students performed four different investigations by combining different substances. Their results are shown in the table to the left. In ​ ​ (a)   , a chemical reaction took place. The other experiments ​ (b)   result in a chemical reaction.

Choose from the below words
Experiment 1
Experiment 2
Experiment 3
Experiment 4
did not
did
26.

Which of the following is a sign that a chemical reaction (or change) has occurred?

a)

change in shape

b)

melting

c)

formation of a gas

d)

dissolving

27.

This change is a

a)

chemical reaction

b)

physical change

c)

musical change

d)

Ice Ice baby

28.

Match the following

a)

Physical change

(Shape)

1.

Cutting paper

b)

Physical change

(solubility)

2.

Dissolving

Kool-Aid

c)

Chemical Change

(Flammability)

3.

Lighting a match

d)

Chemical Change

4.

Creating a new substance

e)

Both a Physical & Chemical change

5.

Bubbles

29.

Dale mixed two substances. Which of the following indicates a chemical change?

a)

it changed state of matter

b)

it changed density

c)

it changed in volume

d)

it changed color

30.
Calculate the Net Force. 
a)
60N, Left 
b)
40N, Right 
c)
0N
d)
60N, Right
31.

unequal forces acting on an object that cause a change in motion

a)

motion

b)

balanced force

c)

net force

d)

unbalanced force

32.
Who wins the tug of war with what net force?
a)
The person on the left with 20 N
b)
The person on the left with 80 N
c)
The people on the right with 20 N
d)
The people on the right with 100 N
33.

If both forces are going in the same direction you should______ those forces

a)

Add

b)

Subtract

c)

Divide

d)

Multiply

34.

When forces are going in the opposite direction of each other you should do what do find the net force

a)

Subtract

b)

Add

c)

Divide

d)

Multiply

35.
The diagram below shows a skateboarder pushing himself forward with a force of 25 N while the wind pushes back with a force of 5 N. How will the skateboarder be affected if the force of the wind increases to 8 N?
a)
The speed of the skateboarder will increase.
b)
The speed of the skateboarder will remain constant.
c)
The speed of the skateboarder will decrease.
d)
The skateboarder will come to a stop.
36.

If the boy is pulling with a force of 10 N and the girl is pushing with a force 20 N, what is the net force on the box?

a)

10 N

b)

20 N

c)

30 N

d)

0 N

37.

Two students kick a soccer ball at the same time. Student A kicks the ball with a force of 80 N to the right. Student B kicks the ball with a force of 45 N to the left. Calculate the net force.

a)

45 N Right

b)

35 N Right

c)

30 N Right

d)

I don't know

38.

Three dogs are pulling on a stuffed animal. Dog A pulls with a force of 150 N to the north. Dog B pulls with a force of 150 N to the south. Dog C (a much smaller dog) is pulling to the east with a force of 40 N. Which dog will win the toy?

a)

dog A

b)

Dog B

c)

Dog C

d)

I don't know

39.

Which direction will the item that receives these forces likely move?

a)

west

b)

southwest 

c)

southeast

d)

east

40.
Students are playing tug-of-war. If group B pulls the rope to the right with a force of 400 N and group A pulls the rope to the left with a force of 250 N, what will happen to the ribbon in the middle of the rope?
a)
The ribbon will move to the left and group A will win the tug-of-war.
b)
The ribbon will move to the left and group B will win the tug-of-war.
c)
The ribbon will move to the right and group B will win the tug-of-war.
d)
The ribbon will move to the right and group A will win the tug-of-war.

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