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Worksheets

Week 1 - Yr 9

Total questions: 76

Worksheet time: 2hrs 55mins

Name
Class
Date
1.
acid + base ₋>
a)
salt + hydrogen
b)
salt + water
c)
salt + carbon dioxide + water
d)
salt
2.
HCl + NaOH → 
a)
NaH + ClOH
b)
NaCl + H2
c)
NaCl + H2O
d)
NaCl + Cl2
3.
what is the reading on this burette?
a)
4.40mL
b)
3.50mL
c)
3.60mL
d)
4.50mL
4.
I have 25mL of 1M HCl which neutralises 20mL of NaOH. What is the concentration of the NaOH?
a)
0.8 M
b)
1 M
c)
1.25 M
5.
Identify the products of the chemical equation
3 LiOH + H3PO4 →
a)
Li3PO4 + 3 H2O
b)
LiPO4 + 3 H2O
c)
Li(PO4)3 + 3 H2O
d)
BOY + La + N2
6.
Changes the color of indicators.
a)
Acids
b)
Bases
c)
All
7.
If phenolphthalein turns bright pink, it indicates
a)
an acid 
b)
a base
c)
a neutral
8.
What does pH measure?
a)
Amount of Oxygen Ions
b)
Amount of Hydrogen Ions
c)
The amount of salt in a solution
d)
The density
9.

What allows us to know when the end point has been reached?

a)

Bubbles

b)

Feels warm

c)

indicator changing color

d)

Turns to a solid

10.

What is this piece of apparatus called

a)

Pipette

b)

Burette

c)

Janette

d)

Cuvette

11.
HCl + NaOH → 
a)
NaH + ClOH
b)
NaCl + H2
c)
NaCl + H2O
d)
NaCl + Cl2
12.

What is the color of the light that potassium compounds give off?

a)

Yellow-orange

b)

Lavender (Violet)

c)

Pinkish red

d)

Green

13.
Metal ion with a lilac flame
a)
Na+
b)
K+
c)
Na2+
d)
K2+
14.
What charge does an electron have?
a)
Negative
b)
Positive
c)
Neutral
15.

Flame tests are most useful for

a)

blood testing

b)

watching fireworks

c)

identification of elements

d)

none of the above

16.

What color flame does copper produce?

a)

Lavender/Purple

b)

Red/Orange

c)

Green

d)

Magenta

17.

An unknown salt produces a red flame during in a flame test. What cation does it contain?

a)

chloride

b)

lithium

c)

copper

d)

calcium

18.

A light blue precipitate formed when sodium hydroxide is added to an unknown solution indicates the presence of.....

a)

barium

b)

calcium

c)

copper

d)

iron(II)

19.

A green precipitate formed when sodium hydroxide is added to an unknown solution indicates the presence of.....

a)

iron(III)

b)

calcium

c)

copper

d)

iron(II)

20.

An orange-brown precipitate formed when sodium hydroxide is added to an unknown solution indicates the presence of.....

a)

iron(III)

b)

calcium

c)

copper

d)

iron(II)

21.

Dilute sodium hydroxide can be added to an unknown solution to indicate the presence of....

a)

iron(II)

b)

iron(III)

c)

copper

d)

all of the above

22.

Cations are ions with what kind of charge?

a)

positive

b)

negative

c)

neutral

23.

Ions are charged particles.

a)

True

b)

False

24.

A pupil suspects an unknown salt contains ammonium NH4+ ions. They place some red litmus paper at the top of a test tube to test for ammonia gas but see no change. What steps did they forget for the test?

a)

Add some sodium hydroxide solution

b)

Heat the tube gently

c)

Putting the red litmus paper into the solid

d)

Nothing, the unknown salt must not have ammonium ions

25.

An unknown salt produces an orange/yellow flame. What cation does it contain?

a)

sodium

b)

lithium

c)

potassium

d)

calcium

e)

copper

26.

A light blue precipitate formed (insoluble in excess) when sodium hydroxide is added to an unknown solution indicates the presence of.....

a)

barium

b)

calcium

c)

copper

d)

iron(II)

27.

What is a positive test for a carbonate ion? (Choose all that apply)

a)

limewater turns cloudy

b)

limewater goes clear

c)

A yellow precipitate is formed

d)

Effervescence

28.

Silver nitrate and nitric acid are used to test for....

a)

metals

b)

noble gases

c)

halogens

d)

metal oxides

29.

A powder is placed into a bunsen burner flame. The colour of the flame is orange-yellow. The ion is

a)

Na+

b)

Li+

c)

Cu2+

d)

K+

30.

Silver nitrate and Nitric acid were mixed with an unknown solution. A cream ppt formed. The formula of the ion present is

a)

I-

b)

Br+

c)

Br-

d)

Cl+

31.

Silver nitrate and Nitric acid were mixed with an unknown solution. A yellow ppt formed. The formula of the ion present is

a)

I2

b)

I+

c)

I-

d)

Br-

32.
Which is the name of the kind of solid substance formed in this figure?  
a)
aqueous 
b)
precipitate
c)
acid
d)
synthesis 
33.
Which of the following compounds will not disassociate in water? 
a)
NaCl
b)
PbCl2
c)
MgNO3
d)
Na2SO4
34.
Describes the number of molecules in a compound and is used to balance a chemical reaction. 
a)
coefficient 
b)
subscript
c)
superscript
d)
SI unit
35.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
36.
Provides evidence that a chemical reaction has occurred. 
a)
dissolving 
b)
melting
c)
formation of a gas
d)
bending
37.
A chemical reaction that shows the formation of a solid and identifies the spectator ions
a)
net ionic equation 
b)
double replacement 
c)
ionic equation 
d)
dissociation 
38.
Describes the number of atoms in a compound of each element. 
a)
coefficient 
b)
superscript 
c)
subscript 
d)
SI unit 
39.
The word oxidation describes 
a)
gain of electrons
b)
loss of electrons 
c)
number of electrons remains the same
d)
number of electrons transfered
40.
The word reduction describes 
a)
gain of electrons 
b)
loss of electrons 
c)
number of electrons remains the same
d)
transfer of electrons
41.
What are the correct coefficients when this equation is balanced?
KClO3  --> KCl  +  O2
a)
2,2,2
b)
2,2,3
c)
1,2,3
d)
3,3,3
42.
Which half reaction shows the element being reduced.  In the following reaction. 
2Na   +   Cl2  --> 2NaCl
a)
Na0   --> Na+1   +   1e-
b)
Cl20  +  2e-  --> 2Cl-
c)
Na0  +  1e- --> Na+1  
d)
Cl20 --> 2Cl-  + 2e-
43.
Potassium iodide is a catalyst in a chemical reaction where would this be placed when writing the chemical reaction? 
a)
product side
b)
reactant side
c)
above the arrow
d)
left out 
44.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
45.
Which of these is NOT a sign that a chemical change has occurred? 
a)
A loss of transparency 
b)
An unexpected color change
c)
A temperature change
d)
The formation of a precipitate
46.
In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?
a)
Reactants
b)
Products
c)
Atoms
d)
Catalysts
47.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
48.
How many Al atoms are in this compound?         4Al2O3
a)
2
b)
8
c)
6
d)
4
49.
How many F atoms are in this compound?
6MgF2 
a)
2
b)
6
c)
8
d)
12
50.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
51.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
52.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
53.
___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
54.
The smell made from spraying perfume on yourself. 
a)
Chemical Change
b)
Physical Change
55.

Which of the following 2 are chemical reactions?

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

56.

Which of the following 2 are chemical reactions?

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

57.

A chemical change is different than a physical change because in a chemical change

a)

chemicals are used

b)

molecules do not physically touch

c)

a new substance is formed and in a physical no new substance is formed

d)

the change can be seen but in a physical change it cannot

58.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

59.

How many Hydrogens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

60.

How many Oxygens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

61.

Why are chemical equations always balanced? Select ALL that apply.

a)

Matter cannot be created.

b)

Matter cannot be destroyed.

c)

Matter can only be rearranged/conserved.

d)

Matter doesn't matter.

62.

In a chemical reaction, if the reactants are heated, the reaction usually happens

a)

slower

b)

faster

c)

at the same rate

d)

in a smaller volume

63.

Some chemical reactions require a substance called a catalyst. The purpose of a catalyst is

a)

to warm up the reaction

b)

to speed up the reaction

c)

to create more reactants

d)

to stop the reaction

64.

What does it mean for a reaction to be exothermic? Choose 2 of the following.

a)

When two substances react, the temperature of the mixture decreases.

b)

When two substances react, the temperature of the mixture increases.

c)

There is less energy going into the reactant to break the bond than there is energy leaving the product.

d)

There is more energy going into the reactant to break the bond than there is energy leaving the product.

e)

The amount of energy entering and leaving is the same.

65.

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

a)

Yes, the amount of atoms for each element are equal on both the reactant and product side.

b)

No, the carbons are not the same number on both the reactant and product side.

c)

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

d)

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

66.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 
a)
true
b)
false
67.
A chemical change is different than a physical change because in a chemical change
a)
Chemicals are used
b)
Molecules do not physically touch
c)
A new substance is formed and in a physical change no new substance is formed
d)
The change can be seen but in a physical change it cannot
68.
The left side of the equation below is called
a)
Products
b)
Reactants
69.
The right side of the equation below is called the
a)
products
b)
reactants
70.
Which statement is not a description of a chemical reaction?
a)
A solid is dropped into a beaker of liquid and a gas is released.
b)
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
c)
A solid is dropped into a beaker of liquid and an explosion occurs.
d)
A liquid is heated in the sun and half of it evaporates.
71.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
a)
Coefficient
b)
reactant
c)
subscript
d)
product 
72.
Which of the following is NOT a sign of a chemical reaction? 
a)
Color changes
b)
Cutting into fourths
c)
Light is produced
d)
Gas is formed
73.
In a chemical reaction
a)
The atoms of the reactants always stay together to form the products
b)
The atoms of the reactants unbond, rearrange, and then rebond to form the products
c)
New atoms are formed which combine to make the products
d)
Some atoms disappear while others multiply to form the products
74.
Which of the following answers will balance the equation below?
__K + __Br2 --> __KBr
a)
2, 1, 1
b)
2, 3, 2
c)
2, 1, 2
d)
1, 2, 3
75.
If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be
a)
4CO₂ + 3H₂O
b)
3CO₂ + 4H₂O
c)
2CO₂ + 3H₂O
d)
3CO + 4H₂O
76.
Which of the following options correctly balances the equation below?
__HNO2 + __O2 --> __HNO3
a)
4, 1, 4
b)
1, 2, 1
c)
1, 2, 1
d)
2, 1, 2

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