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Unit 2: 7.6ABCd Review

Total questions: 60

Worksheet time: 50mins

Name
Class
Date
1.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
2.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
3.
How many Chlorine are in MgCl2?
a)
2
b)
1
c)
3
4.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
5.

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

Mg2As3COHNi2

a)

2

b)

4

c)

6

d)

10

6.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
7.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
8.
What is made up two or more elements that are chemically combined?
a)
Element
b)
Mixture
c)
Compound
d)
Solids
9.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
10.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
11.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
12.
Element or Compound?
H2SO4
a)
Element
b)
Compound
13.
Element or Compound?
H2O
a)
Element
b)
Compound
14.
Element or Compound?
Au
a)
Element
b)
Compound
15.
Element or Compound?
CF3CO2H
a)
Element
b)
Compound
16.
Element or Compound?
Oxygen
a)
Element
b)
Compound
17.
Element or Compound?
NiSO4
a)
Element
b)
Compound
18.

What evidence in the picture indicates that a chemical change occurred?

a)

temperature change

b)

odor

c)

gas

19.
Is mowing the lawn a phyiscal or chemical change?
a)
physical
b)
chemical
20.

Water is heated and changed to steam ________________

a)

Physical Change

b)

Chemical Change

21.

Food is digested in the stomach ________________

a)

Physical Change

b)

Chemical Change

22.
Which of these is a result of a chemical change?
a)
A mixture
b)
A solution
c)
A new substance
d)
Melting or freezing
23.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
24.
Which of the following examples shows that a chemical reaction has occurred? 
a)
A rock breaks into smaller pieces when it is struck with a hammer.
b)
Rust forms on a hammer that has been left outside to long. 
c)
A cup of water turns pink when a few drops of red food coloring are added. 
d)
A solid is formed when heat is removed from a sample of water. 
25.

You know that a chemical reaction is occurring here because you see __________________ . (Pick 3)

a)

purple color

b)

smoke

c)

ice formation

d)

fire

e)

a yellow precipitate

26.

Which is the name of the kind of solid substance formed in this figure?  

a)
aqueous 
b)
precipitate
c)
acid
d)
synthesis 
27.

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

a)

The water in the cake batter evaporates.

b)

The cake rises as gas bubbles form in the baking cake.

c)

The cake takes the shape of the container in which it is baked.

d)

The water in the cake batter is used to keep the cake moist as it bakes.

28.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
29.
 Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
30.

Melting sugar

a)

Physical

b)

Chemical

31.

Some students in a chemistry lab conducted an investigation in which they added four different solid substances to separate beakers of water. They stirred the mixtures for one minute and then recorded their observations in the table below.

Which substance most likely caused a new substance to be formed when mixed with water?

a)

Substance 1

b)

Substance 2

c)

Substance 3

d)

Substance 4

32.

Which of these observations is an indication that a chemical reaction has occurred?

a)

Steam forms above boiling water.

b)

A solid forms when a clear solution is frozen.

c)

A solid forms when two clear solutions are mixed.

d)

Sugar crystals form on the sides of a boiling pot of sugar water.

33.

When two liquids are mixed, the container feels cold to the touch. This is evidence of what?

a)

physical change

b)

chemical change

c)

state of matter change

d)

no change

34.

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

a)

an explosion

b)

a solid stays a solid

c)

a piece of paper is crumpled

d)

two liquids are mixed and it warms up

35.

During digestion the body uses both physical and chemical changes to move and process food. Which of the following is an example of a physical change?

a)

Teeth breaking food down into smaller pieces.

b)

Protein breaking down into amino acids in the stomach.

c)

Enzymes breaking down carbohydrates into simple sugars.

d)

Hydrochloric acid breaking down fats in the stomach.

36.

The solute for salt water is ​ ​ (a)  

Choose from the below words
salt
water
37.

The solvent for salt water is ​ (a)  

Choose from the below words
water
salt
38.

The solutes for coffee are ​ , ​ , and ​ ​ .

a)
coffee
b)
sugar
c)
cream or milk
d)
water
39.

The solvent for coffee is ​ (a)  

Choose from the below words
water
sugar
coffee
milk or cream
40.

The solutes for Coca-Cola are ​ ​and​

a)
carbon dioxide
b)
cola syrup
c)
water
41.

The solvent for Coca-Cola is ​ (a)  

Choose from the below words
water
carbon dioxide
cola syrup
42.
The substance being dissolved in a solution.
a)
sands
b)
solute
c)
solvent
d)
alloy
43.
The substance in which a solute is dissolved
a)
sands
b)
solvent
c)
alloy
d)
negative particles
44.
A solution is a ___________mixture.
a)
heterogeneous
b)
homogeneous
c)
concentration
d)
ionic
45.

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

a)
solute
b)
solvent
c)
water
d)

solution

46.
When water is added to a solution it is called a ______________
a)
dilution
b)
concentration
c)
heterogeneous solution
d)
dissociation
47.

Which type of situation does the image demonstrate?

a)

concentration

b)

dilution

48.

Which type of situation does the image demonstrate?

a)

concentration

b)

dilution

49.

Moving from left to right in the image, is the solution becoming more concentrated or diluted?

a)

concentrated

b)

diluted

50.

What is the difference in dissolving time between a sugar cube and a teaspoon of granular sugar?

a)

The sugar cube dissolves faster

b)

The teaspoon of granular sugar dissolves faster

c)

Both dissolve at the same rate

d)

The dissolving time depends on the temperature of the solvent

51.

What can increase the rate of dissolving even further?

a)

Using a solute with a larger particle size

b)

Using a solute with a smaller particle size

c)

Decreasing the temperature of the solvent

d)

Decreasing the agitation of the mixture

52.

The finer the particles or the more surface area that is exposed, the slower the rate of dissolving.

a)

True

b)

False

53.

Joe set up an experiment to determine if the temperature of the solvent has an affect on the rate of dissolution. Identify the trial that will dissolve the quickest.

A
B
C
D
54.

What combination would dissolve a solid solute the fastest?

a)

high temperature, no stirring

b)

no heat, no stirring

c)

sugar cube, no heat

d)

high temperature, stirring

55.
Which of the following statements is true about how using smaller salt crystals would affect the rate of making a salt solution in water?
a)
Smaller crystals increase the surface area and slow down dissolving.
b)
Smaller crystals decrease the surface area and speed up dissolving.
c)
Smaller crystals increase the surface area and speed up dissolving.
d)
Smaller crystals decrease the surface area and slow down dissolving.
56.

How does cold water affect the speed of dissolving?

a)

Cold water slows down dissolving.

b)

Cold water speeds up dissolving.

c)

Cold water has no effect on dissolving.

d)

Cold water has no effect on dissolving.

57.
Look at the diagram. In this diagram, the blue area represents
a)
the solute
b)
the solvent
c)
the solution
58.
Look at the diagram. In this diagram, the red dots represent
a)
the solute
b)
the solvent
c)
the solution
59.

Which would dissolve faster?

a)

stirring sugar and water 30 times per minute

b)

stirring sugar and water 10 times per minute

60.

What is the rate of dissolving?

a)

How fast a solute dissolves in a solvent

b)

The amount of solute that can dissolve in a solvent

c)

The temperature at which a solute dissolves

d)

The size of the solute particles

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