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Review: Compounds, Mixtures and Reactions

Total questions: 101

Worksheet time: 2hrs 20mins

Name
Class
Date
1.
Air is a compound.
a)
True
b)
False
2.
Compounds are made up of two or more atoms physically combined.
a)
True
b)
False
3.
The properties of the elements that make up a compound are usually very similar to the compound itself.
a)
True
b)
False
4.
How many elements are represented in the compound?
Na2CO3
a)
1
b)
2
c)
3
d)
4
5.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
6.
Does this picture show a compound?
a)
No
b)
Yes
7.
Which of the substances below is a compound?
a)
ink
b)
air
c)
oxygen
d)
salt
8.
Can compounds be found in the periodic table?
a)
Yes
b)
No
9.
Is water an element or a compound?
a)
Element
b)
Compound
10.
A compound consists of two or more elements bound together.
a)
True
b)
False
11.
A chemical change always results in the formation of a:
a)
explosion
b)
big mess
c)
new substance
d)
new state of matter
12.
Water (H2O) freezing is an example of:
a)
A chemical change
b)
A physical change
13.
Element is a
a)
pure substance
b)
compound
c)
mixture
d)
molecule
14.

This diagram represents...

a)

An element

b)

A molecule

c)

A compound

d)

A mixture of elements and compounds

15.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
16.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
17.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds and elements
18.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
19.
Water and alcohol are easily separated by distillation because of their
a)
different densities
b)
different boiling points
c)
different colours
d)
different melting points
20.

Which substances, when mixed together, maintain their original physical properties?

a)

gravel and water

b)

wood chips, water and sand

c)

sand and water

d)

all of the above

21.

A cup of orange juice with pulp is poured into a glass. Which of these procedures could be done to separate the juice from the pulp?

a)

pour the juice through a coffee filter

b)

heat the juice in a pot until boiling

c)

pour the juice in another cup

d)

allow the mixture to settle, leaving the pulp at the bottom of the glass

22.

A mixture of iron filings and chalk dust is placed on a plate. Which of the following could be done to gather the iron filings?

a)

Pour the mixture into a funnel

b)

Put the mixture in a pot on the stove

c)

Run a magnet over the mixture

d)

Filter the mixture through a strainer

23.
A combination of two or more substances where each keeps its own properties and both can be easily separated.
a)
mixture
b)
solution
c)
substance
d)
physical change
24.
Spread out uniformly in a liquid.
a)
dissolve
b)
mixture
c)
solution
d)
soilid
25.

Brass is an alloy consisting of a mixture of

a)

copper and zinc

b)

copper and lead

c)

copper and tin

d)

tin and lead

26.

Which of the following characteristics belong to pure metals?

I. Ductile

II. Malleable

III. Brittle

IV. Good conductor of electricity

a)

I and II

b)

I and IV

c)

I, II and IV

d)

Wait! What are those letters?

27.

Alloy is a ...

a)

A chemical compound with combination between metal and non-metal

b)

A salt contain of two or more elements where the main element is non-metal

c)

Mixture of two or more elements where the main element is metal

28.

Bronze contain copper and

a)

Zinc

b)

Tin

c)

Magnesium

d)

Antimony

29.

Diagram above shows the arrangement of atoms in brass. Which of the following could be atoms X and Y?

a)

X : Copper Y: Tin

b)

X: Zinc Y: Copper

c)

X: Iron Y: Carbon

d)

X: Copper Y: Zinc

30.

Sieving can separate the components of all kinds of mixtures.

a)

True

b)

False

31.

The sieve, which is the tool used in sieving, can only allow particles that are smaller than the pores in the sieve.

a)

True

b)

False

32.

Sieving is.....

a)

good for separating solids and liquids

b)

good for separating solid of different sizes

c)

good for separating a solid that is dissolved in a liquid

33.

What is the function of 3?

a)

prevents air from entering the flask

b)

provides a large surface area for hot vapour to condense

c)

blocks hot vapour from escaping

d)

collects the distillate

34.
The diagram shows the apparatus for separating soil and water. What are the labelled parts?
a)
A = distillate, B = filtrate
b)
A = filtrate, B = residue
c)
A = residue, B = filtrate
d)
A = residue, B = distillate
35.

What is C?

a)

solute

b)

solvent

c)

solution

d)

solid

36.

What is A?

a)

solute

b)

solvent

c)

solution

d)

solid

37.

Which of these particles is NOT able to pass through a sand, gravel, and charcoal filter?

a)

bacteria

b)

water

c)

viruses

d)

large piece of dirt

38.

What does fractional distillation specialize at? (not can do but what is it designed to do)

a)

Separating liquids

b)

Separating solutions

c)

Separating solids and liquids

d)

Non of the above

39.

Which of the following is the best method of obtaining pure water from seawater?

a)

Separating funnel

b)

Simple distillation

c)

Filtration

40.
The physical separation of mixtures into individual components is..
a)
chromatography
b)
opacity 
c)
latent
d)
trace evidence 
41.
chromatography separates the mixture of dyes on the basis of their ----------------------------
a)
density
b)
solubility
c)
gravity
d)
boiling point
42.

A pure substance shows ------------------ spot on chromatogram

a)
0
b)
1
c)
2
d)
3
43.
Which plant species has plant pigments most similar to those in A?
a)
B
b)
C
c)
D
44.

The diagram shows the paper chromatograms of four substances, W, X, Y, and Z.

Which two substance are pure?

a)

W and X

b)

W and Y

c)

X and Y

d)

Z and X

45.

A student is investigating a colored mixture using chromatography.

Where should he place the coloured mixture?

a)

in the solvent

b)

just above the pencil line

c)

just below the pencil line

d)

on the pencil line

46.

Chromatography is used to fin out if a banned dye, P, is present in foodstuffs. The result are shown in the diagram. Which foodstuff contains P?

a)

A

b)

B

c)

C

d)

D

47.

Food colorings contain one or more food dyes. A student used paper colorings (E, F, and G) and one unknown food coloring (H) on the chromatography. The diagram shows the appearance of the paper before and after her experiment. How many food dyes are there in food colouring E?

a)

1

b)

2

c)

5

d)

6

48.

The mixture on the left contains...

a)

All three dyes

b)

None of the dyes

c)

Dye 1 and Dye 2

d)

Dye 1 and Dye 3

e)

Dye 2 and Dye 3

49.
Contains the maximum amount of dissolved solute
a)
unsaturated solution
b)
supersaturated solution
c)
saturated solution
50.
This graph represents a(n) ___ solution
a)
saturated
b)
supersaturated
c)
unsaturated
d)
undefined
51.
What is a substance that is dissolved in another substance? 
a)
solution
b)
solute
c)
solvent
d)
compound
52.
What is a solvent?
a)
The substance that does the dissolving in a solution.
b)
The substance that is being dissolved in a solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
53.
salt water is a 
a)
compound
b)
element
c)
heterogeneous mixture
d)
solution
54.
When a certain amount of solvent cannot hold any more solute it is called a ________ solution.
a)
Diluted
b)
Saturated
55.
When materials combine to form a mixture, they
a)
A. keep their original properties.
b)
B. react to form a new substance with new properties.
c)
C. combine in a specific ratio.
d)
D. always change their physical state.
56.
What does it mean to dilute a solution?
a)
lower the concentration of solute per solvent
b)
increase the concentration of solute per solvent
57.

Solubility refers to the ____ of solute that can dissolve in a certain volume or mass of solvent, at a certain temperature.

a)

Mean

b)

Range

c)

Amount

d)

Mode

58.
A solution is a kind of ________. 
a)
mixture 
b)
compound 
c)
element 
d)
stuff 
59.
Solubility is a ________ property. 
a)
neat 
b)
chemical 
c)
physical 
d)
an organic 
60.

__________ materials allow some light to pass through.

a)
Opaque
b)
Transparent
c)
Translucent
61.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
62.
Measure of the amount of matter 
a)
mass
b)
volume
c)
weight
d)
density
63.

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

a)

The wood disappears.

b)

It stays the same chemically.

c)

The atoms in the wood and oxygen rearrange and form smoke and ash.

d)

Nothing.

64.

15 grams of sugar are dissolved into 300 grams of water. what is the mass of the mixture?

a)

15

b)

315

c)

285

d)

300

65.

250 grams of iron and sand are separated. The mass of the sand is 150 grams. What is the mass of the iron?

a)

is it impossible to determine.

b)

100 grams

c)

150 grams

d)

250 grams

66.
An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?
a)
15 grams
b)
25 grams
c)
20 grams
67.

A fair test can be created using what three steps? (Choose three)

a)

Change only one thing

b)

Measure something

c)

Keep everything else the same

d)

Wearing a Scientist's coat

68.

Controlled variables are...

a)

The one variable that is changed

b)

The variable that is measured

c)

The variables that need to be kept the same

69.

What is the best way to collect and record data?

a)

In a data table

b)

On post-it notes

c)

On scrap paper

d)

interpretive dance

70.
Should experiments be repeated over and over to see if the results are the same each time?
a)
yes
b)
no
71.

The variable that is changed on purpose is..

a)

Constant

b)

Control

c)

Independent Variable

d)

Dependent Variable

72.
The variable that is being tested, counted, or measured and is responding to the independent variable is known as 
a)
Control
b)
Constant
c)
Independent Variable
d)
Dependent Variable
73.
Plants grow best in colored light. What is the independent variable of this statement?
a)
Plant Growth
b)
Colored Light
74.
Which brand of paper towel will absorb the most liquid? What is the dependent variable?
a)
brand of paper towel
b)
amount of water absorbed
75.

You want to check which particles dissolve faster, smaller or bigger ones.

1- What is the independent variable?

2- What are the controlled variables?

4 lines
76.

You want to know which dissolves faster in hot water: salt or sugar.

What is the independent variable?

What are the controlled variables?

4 lines
77.
Freezing Juice?
a)
Physical Change
b)
Chemical Change
78.
Exploding Fireworks?
a)
Physical Change 
b)
Chemical Change 
79.
Melting a chocolate bar?
a)
Physical Change
b)
Chemical Change 
80.
Rotting bananas?
a)
Physical Change
b)
Chemical Change
81.
What happens when a piece of wood burns?
a)
A physical change takes place.
b)
A chemical change takes place.
c)
The wood loses its gravity.
d)
The wood loses its inertia.
82.
Which of the following is the product of the reaction of aluminium and oxygen?
a)
aluminium oxide.
b)
metal oxide
c)
aluminium ore
d)
aluminium and oxygen
83.
Which of the following defines oxidation?
a)
A chemical reaction where a substance gains oxygen.
b)
A chemical reaction where a substance loses oxygen.
c)
A chemical reaction where a substance loses a metal.
d)
A chemical reaction where a substance gains a metal.
84.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

85.

The new substances after occurring the chemical reaction are called...

a)

Reactants

b)

Products

86.
What is this ?
a)
a chemical reaction
b)
a mathematical equation
c)
a chemical equation
87.

Metals and acids react to form .....

a)

Salt and hydrogen

b)

Salt and water

c)

Carbon dioxide, salt and water

d)

Hydrogen only

88.

Magnesium + hydrochloric acid-->

a)

Magnesium chloride + water

b)

Magnesium chloride + hydrogen

c)

Magnesium hydrochloride + hydrogen

d)

Magnesium chloride + water + carbon dioxide

89.

Zinc + sulfuric acid -->

a)

Zinc sulfide + hydrogen

b)

Zinc sulfate + hydrogen

c)

Zinc sulfate + Water +Carbon dioxide

d)

Zinc sulfide + water

90.

Iron + hydrochloric acid -->

a)

Iron chloride + hydrogen

b)

Iron chloride + carbondioxide

c)

Iron hydroxide + acid

d)

Iron chloric + hydrogen

91.

How do we test for hydrogen?

a)

Squeaky pop test

b)

Hydrogen extinguishes a lit splint

c)

Bubbling through lime water

d)

Hydrogen makes a glowing splint relight

92.

Metal carbonates react with acid to form....

a)

Salt, carboxylic acid and water

b)

Salt, carbon dioxide and water

c)

Salt and carbonated water

d)

Salt and hydrogen

93.

Calcium carbonate + hydrochloric acid -->

a)

Calcium chloride + hydrogen

b)

Calcium choride + water

c)

Calcium chloride + carbon dioxide + water

d)

Calcium sulfate + carbon dioxide + water

94.

Copper carbonate + hydrochloric acid -->

a)

Copper chloride + hydrogen

b)

Copper chloride + water

c)

Copper chloride + water + hydrogen

d)

Copper chloride + water + carbondioxide

95.

The two tests for carbon dioxide are ...

a)

It will extinguish a lit splint

b)

It will cause a squeaky pop

c)

It will explode

d)

When bubbled through lime water it turns the water cloudy

96.

What gas is always produced when a metal reacts with acid?

a)

Oxygen

b)

Hydrogen

c)

Carbon dioxide

d)

Nitrogen

97.

What gas is always produced when carbonates reacts with acids?

a)

Oxygen

b)

Hydrogen

c)

Carbon dioxide

d)

Nitrogen

98.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
99.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

100.

In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?

a)

2Mg and O2

b)

2MgO

c)

Mg and MgO

d)

O and MgO

101.

2H2O + 2N → 4H + 2NO

The chemical symbols on the RIGHT (at the end of the equation) are called:

a)

products

b)

reactants

c)

yields/produces

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