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Molecules & Mixtures Unit

Total questions: 60

Worksheet time: 2hrs 59mins

Name
Class
Date
1.
A pure substance that cannot be broken down into other substances by chemical or physical means. 
a)
compound          
b)
atom
c)
mixture 
d)
element
2.

Which of these is an element?

a)

Salt (NaCl)

b)

Water (H20)

c)

Oxygen (O)

d)

Carbon Dioxide (CO2)

3.

Which of these is a compound?

a)

Aluminium (Al)

b)

Carbon Dioxide (CO2)

c)

Nitrogen (N)

d)

Sand

4.

Which of these is a mixture?

a)

Laundry Detergent

b)

Salt (NaCl)

c)

Oxygen (O)

d)

Fluorine (Fl)

5.

Air is:

a)

An element

b)

A compound

c)

A mixture

d)

None of these

6.
What is an example of a mixture?
a)
iron
b)
ice
c)
soil
d)
gold
7.
Jorge prepared a drink and salad for dinner. The chart lists the ingredients for both.
Using the information in the chart, which statement is the BEST description of the drink and salad?
a)
The salad and fruit drink are both mixtures.
b)
The salad and the fruit drink are both solutions.
c)
The fruit drink is a mixture because the ingredients can't be separated.
d)
The salad is a solution because the ingredients can't be separated.
8.

Which of the following is classified as a pure substance?

a)

Lemonade

b)

Fruit punch

c)

ketchup

d)

Helium

9.
A mixture that is uniform and well mixed is _____.
a)
homogeneous
b)
hetergeneous
c)
pure substance
d)
compoud
10.
The picture shown here is what type of mixture?
a)
homogeneous
b)
hetergeneous
c)
pure substance
d)
element
11.
This diagram represents a _____.
a)
pure substance that is a compound
b)
mixture of elements
c)
pure substance that is an element
d)
mixture of compounds
12.

What is this?

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

13.
Milk
a)
Heterogeneous mixture
b)
Homogeneous mixture
14.
cake batter
a)
heterogeneous mixture
b)
homogeneous mixture
15.
Chicken noodle soup
a)
heterogeneous mixture
b)
homogeneous mixture
16.
a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous MIxture

17.

What is it?

a)

Pure Substance

b)

Mixture

18.

What is it?

a)

Pure Substance

b)

Mixture

19.

When there is one type of atom

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

20.

When there is 2 or more atoms combined together

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

21.

Salt

a)

Mixture

b)

Compound

22.

Water

a)

Element

b)

Compound

23.

Oxygen

a)

Element

b)

Compound

24.

Saltwater

a)

Mixture

b)

Compound

25.

Air

a)

Homogeneous mixture

b)

Heterogeneous mixture

26.

Which of the following statements is true concerning acids and bases?

a)

acids and bases don't react with each other

b)

acids mixed with bases neutralize each other

c)

acids mixed with bases make stronger bases

d)

acids mixed with bases make stronger acids

27.

Neutral solutions have a pH of:

a)

0

b)

1

c)

7

d)

14

28.

Which is true?

a)

pH of less than 7 is basic; pH of more than 7 is acidic

b)

pH of less than 7 is acidic; pH of more than 7 is basic

29.

Vinegar, fruit juice, and cola are examples of:

a)

strong acids

b)

strong bases

c)

strong bases

d)

weak acids

30.

NaOH may be found in drain cleaners and as a component of soaps. Is NaOH an acid or a base?

a)

Acid

b)

Base

c)

Neither (Neutral)

31.

Is laundry detergent an acid or a base?

a)

Acid

b)

Base

c)

Neither (Neutral)

32.

Ammonia is found in many household products, including window cleaner. What is the pH of ammonia?

a)

It's acidic.

b)

It's basic.

c)

It's neutral.

33.

Is pure water acidic, basic, or neutral?

a)

Acidic

b)

Basic

c)

Neutral

34.

Vinegar is an example of:

a)

An acid.

b)

A base.

c)

Neither an acid nor a base.

35.

Stronger acids have a pH closer to...

a)

7

b)

0

c)

14

d)

9

36.

Weaker bases have a pH closer to...

a)

8

b)

0

c)

14

d)

4

37.

A pH level of 7 indicates

a)

acid

b)

base

c)

neutral

d)

none of the following

38.

The pH scale is a range from:

a)

1-7

b)

0-14

c)

1-5

d)

1-14

39.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
40.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
41.

What is the only substance with a neutral pH of 7?

a)

Milk

b)

Orange Juice

c)

Pure water

d)

Bleach

42.

Which of the following is an acid?

a)

soap

b)

baking soda

c)

orange juice

d)

pure water

43.

What would be considered the weakest base?

a)

3

b)

14

c)

8.2

d)

11.6

44.

Which property is not associated with acids?

a)

Sour taste

b)

strong acids can burn you

c)

turns litmus paper blue

d)

reacts with metals

45.

Tastes bitter.

a)

Acids

b)

Bases

c)

None of the following

d)

Acids & Bases

46.

What would be considered the strongest base?

a)

8

b)

14

c)

7.8

d)

11.6

47.

You test a solution with pH paper, and the paper turns blue. The solution is ______.

a)

neutral

b)

an acid

c)

a base

d)

an acid & a base

48.

Tastes sour

a)

acid

b)

base

c)

neutral

d)

both acids & bases

49.

What type of paper is used to test for acids and bases?

a)

Red paper

b)

Blue paper

c)

Lined paper

d)

Litmus paper

50.
Which one of the following would you use to separate sand from iron filings?
a)
a bar magnet
b)
filter paper
c)
chromatography paper
d)
alum
51.
Water and alcohol are easily separated by distillation because of their
a)
 different melting points
b)
different colours
c)
different densities
d)
different boiling points
52.
To separate a mixture of soil and water what separation method is used?
a)
Filtration
b)
Distillation
c)
Chromatography
d)
Evaporation
53.
To separate a mixture of salt and water what separation method is used?
a)
Filtration
b)
Distillation
c)
Chromatography
d)
Evaporation
54.

Solubility is defined as

a)

the ability to catch on fire

b)

the ability to be dissolved

c)

the ability to fly.

55.
The substance being dissolved in a solution.
a)
sands
b)
solute
c)
solvent
d)
alloy
56.
The substance in which a solute is dissolved
a)
sands
b)
solvent
c)
alloy
d)
negative particles
57.
In a sample of salt water, NaCl would be considered the ______.
a)
Solution
b)
Solute
c)
Solvent
d)
Solvation
58.
If we are making Kool-aid with sugar, Kool-aid powder, and water, which part is the solvent?
a)
water
b)
powder
c)
sugar
d)
powder and sugar
59.
In this mixture, which of the following will be the solute?
a)
The water in the glass
b)
The glass that holds the final mixture
c)
The solution containing both powder and water
d)
The powder on the spoon
60.
When a solution is saturated:
a)
No additional material will dissolve in it
b)
You need to stir it more 
c)
Two materials have combined to create a clear liquid
d)
Crystals form 

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