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Chemical reactions and equations

Total questions: 176

Worksheet time: 4hrs 50mins

Name
Class
Date
1.
During a lab experiment, a scientist numbers three beakers. Next, she pours 150 mL of  liquid into each beaker. Each liquid is different.Then, the scientist adds 5 g of white solid baking soda (NaHCO3) to each beaker and stirs. She observes the results.
In which of the beakers does the scientist observe clear evidence of a chemical reaction?
a)
beaker 1 only
b)
beaker 2 only
c)
beaker 3 only
d)
beakers 1,2, and 3
2.
Which of the following is a chemical reaction?
a)
Water freezes.
b)
Sugar dissolves in water.
c)
Salt and pepper are mixed in a dish.
d)
Iron rusts.
3.
When two substances were combined, bubbles were produced and the temperature dropped.  This most likely means that:
a)
a chemical reaction took place
b)
the two substances had low boiling points
c)
one substance dissolved in the other
d)
the two substances are non-reactive
4.
Before a chemical reaction, the total mass of two reactants is measured to be 40 grams.  After the reaction, what should be the total mass of the products?
a)
0 grams
b)
20 grams
c)
40 grams
d)
80 grams
5.
Copper chloride and aluminum react to produce aluminum chloride and copper.  Which of the following is the correctly balanced chemical equation for this reaction?
a)
CuCl2 + Al -> AlCl3 + Cu
b)
3CuCl2 + Al -> AlCl3 + 2Cu
c)
3CuCl2 + 2Al -> 2AlCl3 + 3Cu
d)
CuCl2 + 3Al -> AlCl3 + 2Cu
6.
Which observation would most likely indicate that an exothermic reaction has occurred?
a)
a color change
b)
the production of gas bubbles
c)
an increase in temperature
d)
a decrease in temperature
7.
The first part of a balanced chemical equation is shown:  H2SO4 + 2NaOH → ________.  In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?
a)
2
b)
3
c)
4
d)
5
8.
Suppose two substances were combined together in a beaker. You know that a chemical reaction occurred if:
a)
new substances were created.
b)
one substance dissolved in the other.
c)
one substance melted in the other.
d)
 the two substances remained separate.
9.
All of the following are indicators of a chemical reaction except one.  Which one is NOT an indicator that a chemical reaction has taken place?
a)
he production of heat or light
b)
a color change
c)
the production of gas bubbles
d)
the dissolving of one substance in another
10.
 The idea that matter is neither created nor destroyed in chemical reactions is known as the:
a)
 The idea that matter is neither created nor destroyed in chemical reactions is known as the:
b)
law of conservation of energy.
c)
 law of conservation of mass.
d)
second law of thermodynamics.
11.
A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H2The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?
a)
Na2Cl + H2
b)
 2NaCl + H2
c)
NaCl + 2H2
d)
 2NaCl + 2H2
12.
The law of conservation of matter states that:
a)
matter is neither created nor destroyed.
b)
the mass of the products is always greater than the mass of the reactants.
c)
 the mass of the products is always less than the mass of the reactants.
d)
matter is always converted into an equal amount of energy.
13.
A balanced chemical equation is one in which:
a)
the number of atoms of each element is the same in both the reactants and the products.
b)
the same compounds are present in both the reactants and the products.
c)
the reactants and the products have equal densities.
d)
 the reactants and the products have equal volumes.
14.
Which observation would most likely indicate that an endothermic reaction has occurred?
a)
a color change
b)
the production of gas bubbles
c)
an increase in temperature
d)
 a decrease in temperature
15.
The first part of a balanced chemical equation is shown:  Cu + 2AgNO3 → ________.  In order for this equation to be balanced, how many oxygen (O) atoms must be present in the products?
a)
2
b)
3
c)
5
d)
6
16.
Suppose the mass of two reactants totals 10 grams.  After the chemical reaction, what should be the total mass of the products?
a)
0 grams
b)
5 grams
c)
10 grams
d)
20 grams
17.

Chemical formula of quick lime is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

18.

Silver article turns black when kept in open for a few days due to formation of

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

19.

A chemical equation should be balanced to :

a)

show conservation of energy

b)

show conservation of mass

c)

to make equation attractive

d)

All of the above

20.

Which of the following is not a chemical reaction ?

a)

Formation of salt solution

b)

Milk turns sour in hot weather

c)

Burning of match stick

d)

Contamination of food

21.

The reaction in which two compound exchange their ions to form two new compounds is called

a)

displacement reaction

b)

combination reaction

c)

redox reaction

d)

double displacement reaction

22.

Which of the following reactions involves the combination of two elements :-

a)

CaO + CO2 -> CaCO3

b)

4Na + O2 -> 2Na2O

c)

SO2 +(1/2)O2 -> SO3

d)

NH3 + HCI -> NH4CI

23.

3.What happens when copper rod is dipped in iron sulphate solution :-

a)

Copper displaces iron

b)

Blue color of copper sulphate solution is obtained

c)

No reaction takes place

d)

Reaction is exothermic

24.

7.The equation

Cu + xHNO3 -> Cu(NO3)2 + yNO2 + 2H2O

The values of x and y are

a)

3 and 5

b)

8 and 6

c)

4 and 2

d)

7 and 1

25.

White silver chloride in sunlight turns to :

a)

Grey

b)

Yellow

c)

Remain white

d)

Red

26.

Which of the following does not corrode when exposed to the atmosphere-

a)

Fe

b)

Cu

c)

Au

d)

Ag

27.

Black and white photography uses

a)

Decomposition of silver chloride

b)

Decomposition of silver bromide

c)

Both

d)

None of these

28.

Rusting of an iron is an example of :

a)

Reduction

b)

Ionization

c)

Oxidation

d)

Dissociation

29.

Which of the following product is formed when calcium oxide reacts with water?

a)

Slaked lime

b)

Carbon dioxide

c)

Calcium oxide

d)

Oxygen gas

30.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

31.
The first part of a balanced chemical equation is shown:  H2SO4 + 2NaOH → ________.  In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?
a)
2
b)
3
c)
4
d)
5
32.
A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H2The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?
a)
Na2Cl + H2
b)
 2NaCl + H2
c)
NaCl + 2H2
d)
 2NaCl + 2H2
33.
Which of the following statements about the given reaction are correct?3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)(i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent
a)
(i), (ii) and (iii)
b)
(iii) and (iv)
c)
(i), (ii) and (iv)
d)
(ii) and (iv)
34.
Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O
a)
(i) and (iv)
b)
(ii) only
c)
(i) and (ii)
d)
(iii) and (iv)
35.
Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O
a)
(i) and (iv)
b)
(ii) only
c)
(i) and (ii)
d)
(iii) and (iv)
36.
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
a)
(a) 1:1
b)
(b) 2:1
c)
(c) 4:1
d)
(d) 1:2
37.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
38.

Chemical formula of lime water is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

39.

Silver article turns black when kept in open for a few days due to formation of

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

40.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

41.

7.The equation

Cu + xHNO3 -> Cu(NO3)2 + yNO2 + 2H2O

The values of x and y are

a)

3 and 5

b)

8 and 6

c)

4 and 2

d)

7 and 1

42.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

43.

These are all models of the same molecule. What would this molecule look like in a chemical/molecular formula?

a)

CH

b)

C4H

c)

CH4

d)

4CH

44.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
45.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
46.

Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

a)

CO2 + H2O --> C6H12O6 + O2

b)

C6O + H12O --> C6H12O2

c)

CO2 + H2O --> C6H12O6 + O2

d)

CO2 +H2O --> C6H12O6 +O2

47.

For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and wrote down the changes. Which change shows that a CHEMICAL REACTION took place?

a)

A dark solid (precipitate) formed on the zinc metal.

b)

The zinc metal stayed silver-colored and shiny

c)

The CuSO4 solution evaporated after the zinc metal was added.

d)

None of these

48.

What is matter?

a)

Matter is made of atoms.

b)

Matter is a measure of the amount of material in an object.

c)

Matter may exist as a solid, liquid, or a gas.

d)

Matter forms when particles chemically bond together.

e)

Matter includes both elements and compounds.

49.

What type of chemical reaction is burning paper?

a)

Chemical

b)

Physical

50.

What breaks during a chemical reaction?

a)

glass

b)

bonds

c)

molecules

d)

atoms

51.

Instead of using a chemical's long name, scientists use this instead when writing a chemical equation.

a)

Shorthand

b)

Braile

c)

Elemental symbols

d)

Elemental Code

52.

How do you know a chemical reaction has occured?

a)

Properties of the materials change.

b)

Energy in the system changes.

c)

Both A & B are correct.

d)

Neither A nor B are correct

53.

When I want to balance a chemical equation, this is the only number that I can change.

a)

Subscript

b)

Coefficient

c)

Elemental Symbol

d)

Yields

54.

The subscript tells you how many of what there are in a chemical reaction?

a)

atoms of that element

b)

molecules of that compound

c)

number of reactions

d)

They don't tell you anything.

55.

A coefficient tells you what about the chemical reaction?

a)

Numbers of atoms in that element

b)

Numbers of molecules for that compound.

c)

How many reactions there are.

d)

They don't tell you anything.

56.

The following is an example of :

4NH3 + 5O2 -----> 4NO + 6H2O

(i) displacement reaction

(ii) combustion reaction

(iii) redox reaction

(iv) neutralization reaction

a)

(i) and (iv)

b)

(ii) and (iii)

c)

(i) and (ii)

d)

(iii) and (iv)

57.

The electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water

a)

1:1

b)

2:1

c)

4:1

d)

1:2

58.

Which of the following processes involve chemical reactions

a)

Storing of oxygen gas under pressure in a gas cylinder

b)

Liquification of air

c)

Keeping petrol in a china dish in open

d)

Heating copper wire in the presence of air at high temperature

59.

Identify the type of reaction :

Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.

(a)  

60.

What is the formula of magnesium nitride?

a)

MgN3

b)

Mg2N3

c)

Mg3N2

d)

Mg2N

61.

What are the products of decomposition of PbCO3

a)

PbO + CO2

b)

Pb + CO2 + O2

c)

PbO + C

d)

Pb + C + O2

62.

A metal 'M' reacts with an acid according to the equation :

M + H+ --------> M3+ + H2

The metal can be

a)

Potassium

b)

Magnesium

c)

Aluminium

d)

Barium

63.

When dil. sulphuric acid is added to pieces of iron sulphie, hydrogen sulphide gas is produced and soluble ferrous sulphate is produced. The type of chemical reaction involved is :

a)

Decomposition reaction

b)

Combination reaction

c)

Displacement Reaction

d)

Double displacement reaction

64.

When ethane reacts with oxygen present in air it produces CO2 and water. In this reaction how many moles of oxygen is used?

a)

3

b)

5/2

c)

2

d)

7/2

65.

Which of the following is not a type of reduction

a)

Gain of hydrogen

b)

loss of electron

c)

loss of oxygen

d)

gain of electron

66.

A powdered salt X was heated in a dry test tube and evolution of brown fumes of nitrogen dioxide and a yellow residue of lead oxide is formed. The salt X is :

a)

Magnesium Carbonate

b)

Lead nitrate

c)

Ammonium Sulphate

d)

Calcium carbonate

67.

Reaction of Na and H2O gives a very strong base , NaOH and another product, a gas. How do you test for this gas ?

a)

Pass it through lime water, turns milky.

b)

Rotten egg smell

c)

Burns with a dazzling flame

d)

Burns with a pop sound

68.

Which of the following is endothermic reaction?

a)

Dissolution of ammonium chloride in water

b)

Dilution of sulphuric acid

c)

Dissolution of sodium hydroxide in water

d)

Reaction of zinc with HCl

69.

In a chemical reaction between sulphuric acid and barium chloride solution, the white precipitate formed is ----

a)

HCl

b)

Chlorine

c)

Sulphur

d)

Barium sulphate

70.

The respiration process in which glucose reacts with oxygen to produce energy is

a)

Exothermic reaction

b)

Endothermic reaction

c)

Reversible reaction

d)

Combination reaction

71.

Neutralisation reaction between an acid and base is a type of----

a)

Displacement reaction

b)

Double displacement reaction

c)

Addition reaction

d)

Decomposition reaction

72.

2 PbO + C = 2 Pb+ CO2

a)

Redox reaction

b)

Decomposition reaction

c)

Oxidation reaction

d)

Displacement reaction

73.

Name the product formed when CaO reacts with water

a)

Calcium hydroxide

b)

CO2 + Ca

c)

Ca+ H2O

74.

Write balanced chemical reaction-

Sodium+ water = Sodium hydroxide + Hydrogen

4 lines
75.

Why does Silver chloride turn grey in sunlight ?

a)

Due to corrosion

b)

Due to the formation Ag and Cl

c)

Due to the formation of silver hydroxide

76.

Balance

BaCl2 +H2SO4 = BaSO4 +HCl

4 lines
77.

When CaCO2 is heated the products are

a)

CaO + CO2

b)

CaOH2

c)

Ca+ H2O

78.

2Cu +O2 =2 CuO when heated.

Name the reaction

a)

Reduction

b)

Oxidation

c)

Redox reaction

d)

Exothermic

79.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
80.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

81.

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

a)

2Mg and O2

b)

2MgO

c)

Mg and MgO

d)

O and MgO

82.

Which is NOT an example of chemical change?

a)

production of gas.

b)

change in color.

c)

change in size.

d)

transfer of energy.

83.

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

84.

How many atoms are represented in the reactants of this equation?

a)

6

b)

12

c)

24

d)

36

85.

Which of the following could be an organic compound? Hint: organic means it contains Carbon!

a)

NH3

b)

H2O

c)

CaCl2

d)

CH4

86.

Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

a)

CO2 + H2O --> C6H12O6 + O2

b)

C6O + H12O --> C6H12O2

c)

CO2 + H2O --> C6H12O6 + O2

d)

CO2 +H2O --> C6H12O6 +O2

87.

Which of the following pictures is an example of a chemical change?

a)

Wood burning in a fireplace

b)

ice melting in water in a beaker

c)

a cracked rock

d)

boiling water on a hotplate

88.

Which of the following models best demonstrates a balanced chemical equation?

a)

F

b)

G

c)

H

d)

J

89.

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

a)

The shape of the coal changes

b)

Oxygen is present

c)

A new substance is produced

d)

Coal is made up of more than one element

90.
How is a physical change different from a chemical change?
a)
There is absolutely no difference
b)
Chemical changes produce a new substance, physical changes stay the same substance
c)
Chemical changes create and destroy matter, physical changes don't
d)
Physical changes create and destroy matter, chemical changes dont
91.

A student listed how different parts of the body work to aid in the digestion of food.

Which of the following is a chemical change that occurs to the food?

a)

The food particles break into smaller pieces as food is chewed

b)

The movement of food to the stomach after food is swallowed

c)

The breakdown of molecules of food by enzymes and acid in the stomach to form new substances

d)

None of the above

92.
 Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
93.

Al2

a)

A single atom

b)

Elemental Molecule

c)

Compound Molecule

d)

None of these

94.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
95.

How many Aluminum atoms are in Al2O3?

a)

3

b)

2

c)

5

96.

Does this follow the Law of Conservation of Mass? (Is it balanced?)

Na + H2O --> NaOH + H2

a)

Yes

b)

No

97.
What is the little number after an element in a chemical equation called?
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
98.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
99.
What is the left part of a chemical equation called...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
100.
Balance this equation...
H2 + Cl2 --> HCl
a)
It is balanced 
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
d)
Not enough information is given
101.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
102.
Is this balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
103.
In the equation,
2Mg + O2 ---> 2MgO
which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
104.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
105.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
d)
there is not enough information
106.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
d)
I have no clue
107.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
108.
After you mix two substances together, a new substance forms.  This is an example of:
 
a)
 Physical Change
b)
 Chemical Change
109.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
110.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
111.
When you freeze water, it turns to ice.  What process is this?
a)
 Exothermic
b)
Endothermic
112.
When iron nails get rusty, heat is released.  What kind of change is this?
a)
Chemical
b)
Physical
113.
When iron nails get rusty, heat is released.  What process is this?
a)
Exothermic
b)
Endothermic
114.
Which of the following best describes the process of nuclear fission? 
a)
Splitting an atom's nucleus apart 
b)
Separating an atom's electrons from its nucleus 
c)
Fusing two atomic nuclei together 
d)
Splitting an atom's electrons in half 
115.
Negatively charged particles found outside of the nucleus are called
a)
electron
b)
protons
c)
neutrons
d)
nucleons
116.
Positively charged particles found in the nucleus of an atom are called
a)
protons
b)
neutrons
c)
electrons
d)
isotopes
117.
This type of reaction occurs on the sun and in stars.
a)
Fission
b)
Fusion
c)
Synthesis
d)
Decomposition
118.
Total mass before a chemical reaction is the same as the mass after the chemical reaction is
a)
law of conservation of mass
b)
reactant
c)
product
d)
yield
119.
a chemical substance present at the start of a chemical reaction
a)
product
b)
reactant
c)
yield
d)
chemical formula
120.
unexpected color-change is a sign of a
a)
physical change
b)
reactant
c)
chemical change
d)
yield
121.
example of physical change
a)
mixing paint together
b)
making pancakes
c)
breaking glow sticks
d)
fireworks
122.
FeNa is a
a)
yield
b)
compound
c)
chemical change
d)
law of conservation of mass
123.
Fe2O3 has
a)
2 Iron atoms, 3 oxygen atoms
b)
6 iron atoms, 6 oxygen atoms
c)
3 iron atoms, 2 oxygen atoms
d)
1 iron atom, 6 oxygen atoms
124.
6CO2 + 6H2O contains how many elements
a)
4
b)
36
c)
3
d)
2
125.
Example of physical change
a)
putting an object in a box
b)
rusting cans
c)
lighting a match
d)
putting acid on copper
126.
evidence of a chemical reaction
a)
boiling water
b)
folded clothes
c)
gas is released
d)
tearing paper
127.
when baking you know a chemical reaction has occurred because
a)
the product taste better than the reactant
b)
the ingredients can not be returned to their original state
128.
a chemical equation is balanced when
a)
the number of elements are equal
b)
the mass of the reactants is equal to the mass of the products
c)
the reactants are more than the products
d)
the products have the most mass
129.
CO2 + 3H2O yields 2HO2 + C why is this equation unbalanced?
a)
it is balanced
b)
the mass of the products is greater than the mass of the reactants
c)
the mass is equal
d)
the mass of the reactants is greater than the mass of the products
130.
Which equation follows law of conservation of mass?
a)
C5H12 + 7O2 → 5CO2 + 6H2O
b)
2K + Ca(NO3)2 → K(NO3) + Ca
c)
6CO2+ 6H2O C6H12O6+ 6O2
d)
2VCl2 + H2 → 2HCl + V
131.
How many oxygen atoms are in the following compound 2Al2(CO3)3 
a)
1
b)
3
c)
6
d)
18
132.
when you combine hydrochloric acid with baking soda you know a chemical reaction occurs because their
a)
is evaporation
b)
are bubbles
c)
is dissolving
d)
is freezing
133.

In the equation what is the mass of the new substance FeS?

S + Fe = FeS

32g + 56g = ?

a)
88
b)
56
c)
32
d)
24
134.

when does a chemical reaction take place ?

a)

when a physical change occurs

b)

when a chemical change occurs

c)

both a and b

d)

none of the above

135.

What are the substances on the left side called and right side of the chemical equation called respectively ?

a)

products and reactants

b)

groups and electrons

c)

nothing

d)

reactants and products

136.

Which of the following is not a physical change?

a)

(a) Boiling of water to give water vapour

b)

(b) Melting of ice to give water

c)

(c) Dissolution of salt in water

d)

(d) Combustion of Liquefied Petroleum Gas (LPG)

137.

Which of the following statements about the given reaction are correct?

3Fe(s) + 4H2O(g) => Fe3O4(s) + 4H2(g)

(i) Iron metal is getting oxidised

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as oxidising agent

a)

(a) (i), (ii) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (i), (ii) and (iv)

d)

(d) (ii) and (iv)

138.

which of the following observations helps to determine that a chemical reaction has taken place ?

a)

change in state

b)

change in color

c)

change in temperature

d)

all of the above

139.

A solution of X is used for white washing walls. it reacts slowly with Y in air to form a thin layer of B on walls which gives walls a shiny finish. which of the following options correctly represents X,Y and B ?

a)

X =slaked lime , Y = nitrogen , B=calcium oxide

b)

X =Calcium Hydroxide, Y=Oxygen, B = Calcium carbonate

c)

X= slaked lime, Y=Carbon oxide,B= calcium chloride

d)

X= slaked lime,Y=Carbon dioxide,B=Calcium carbonate

140.

What is the process that is happening in this image ? And also give the name of the two gas that are present in two test tubes and the ratio they(gases) are present in .

a)

process= thermal decomposition,

gases present=hydrogen,carbon dioxide, ratio=2:1

b)

process=corrosion,

gases present=oxygen,hydroxide, ratio=2:1

c)

process=electrolysis of hydrogen polyoxide

gases present=hydrogen,oxygen, ratio=2:1

d)

process=electrolysis of water

gases present=hydrogen,oxygen,ratio=4:2

141.

Choose the correct balanced equation of barium chloride and aluminium sulphate.

a)

3BaCl2+Al2(SO4)3→3BaSO4+2AlCl3

b)

2BaCl2+Al2(SO4)3→2BaSO4+2AlCl3

c)

6BaCl2+2Al2(SO4)3→6BaSO4+4AlCl3

d)

none of the above

142.

Choose the incorrect statement from the following options about saving foods from rancidity.

a)

keep food items in air tight containers

b)

flushing food items with carbon dioxide

c)

flushing food items with nitrogen

d)

keep food items in air loose containers

143.
The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction
a)
(i) and (iv)
b)
(ii) and (iii)
c)
(i) and (iii)
d)
(iii) and (iv)
144.

Silver article turns black when kept in open for a few days due to formation of

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

145.

In which of the following process a chemical reaction has taken place?

a)

Ice melts into water

b)

A wet shirt got dried in sunlight

c)

A brown layer is formed over iron rod kept in air

d)

sugar getting dissolved in water

146.
Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride
a)
(a) (i) only
b)
(i) and (iii)
c)
(c) (ii) and (iii)
d)
(d) (iv) only
147.
Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid(iii) Evaporation of water (iv) Sublimation of camphor (crystals)
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(i) and (iv)
d)
(iii) and (iv)
148.

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

149.

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

150.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

151.

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

a)

1

b)

2

c)

3

d)

4

152.

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.

153.

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

154.

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

155.

What does it mean for a reaction to be endothermic? 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.

156.

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.

157.

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.

158.

Which is the correct word equation for photosynthesis?

a)

water + glucose + oxygen ---> energy + carbon dioxide

b)

energy + oxygen + carbon dioxide ---> water + glucose

c)

water + carbon dioxide + energy ---> glucose + oxygen

d)

glucose + oxygen ---> water + carbon dioxide + energy

159.

Which of the following is the word equation for cellular respiration?

a)

water + carbon dioxide + energy ---> glucose + oxygen

b)

water + glucose ---> energy + carbon dioxide + oxygen

c)

oxygen + carbon dioxide ---> water + energy + glucose

d)

glucose + oxygen ---> water + carbon dioxide + energy

160.

Photosynthesis takes place in the

a)

mitochondria

b)

chloroplast

c)

nucleus

d)

cytoplasm

161.

cellular respiration takes place in the

a)

mitochondria

b)

chloroplast

c)

nucleus

d)

cytoplasm

162.

What is the purpose of photosynthesis. Select all that apply.

a)

to form glucose, food for the plant

b)

to form carbon dioxide

c)

to form oxygen

d)

to form energy

e)

to form water

163.

What is the purpose of cellular respiration. Select all that apply.

a)

to form glucose

b)

to form oxygen

c)

to form carbon dioxide

d)

to form energy

e)

to form water

164.

Which of the following is a common sign that a chemical change has occurred?

a)

A chemical has turned a different color, bubbled, and/or changed temperature.

b)

A chemical has changed to a different state of matter, such as a liquid to a solid.

c)

A chemical has changed size.

d)

A chemical has become a different shape.

165.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
166.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
167.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
168.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
169.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
170.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
171.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
172.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
173.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
174.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
175.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
176.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2

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