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practice-JAY

Total questions: 120

Worksheet time: 2hrs 52mins

Name
Class
Date
1.

A change in which a substance undergoes changes in its physical properties is called _____.

a)

chemical change

b)

physical change

c)

irreversible change

d)

biological change

2.

Browning of an apple after it is cut is an example of ____.

a)

physical change

b)

chemical change

c)

reversible change

d)

biological change

3.

When Magnesium ribbon is burnt in oxygen, the product obtained is ___.

a)

Magnesium chloride

b)

Magnesium sulphate

c)

Magnesium carbide

d)

Magnesium oxide

4.

When Magnesium ribbon is ignited using a candle flame, it burns with a __________.

a)

sparkling red light

b)

dull yellow light

c)

bright green light

d)

brilliant white light

5.

Which of the following is a physical change?

a)

Rusting of iron

b)

Melting of wax

c)

Burning of coal

d)

Curdling of milk

6.

Which of the following is a chemical change?

a)

Twinkling of stars

b)

Cutting of fruits

c)

Cooking of vegetables

d)

Boling of water

7.

A chemical change may involve ____________.

a)

change in color only

b)

change in temperature only

c)

evolution of gas only

d)

all of the above

8.

Which of the following is/are true when milk changes to curd?

(i) Its state is changed from liquid to semi solid

(ii) It changes color

(iii) It changes taste

(iv) The change cannot be reversed.

Choose the correct option from the ones given below:

a)

(i) and (ii) are correct

b)

(ii) and (iii) are correct

c)

(i), (iii) and (iv) are correct

d)

All are correct

9.

Which of the following is incorrect for a chemical reaction?

a)

Heat may be given out but never absorbed

b)

Sound may be produced

c)

A color change may take place

d)

A gas may be evolved

10.

Which of the following is false?

a)

When a candle burns, both physical and chemical changes take place.

b)

Stretching of a rubber band is not a physical change

c)

Melting of ice is a physical change

d)

Dissolving common salt in water is not a chemical change

11.

The gas that we use in the kitchen is liquefied petroleum gas (LPG). In a cylinder, it exists as a liquid. When it is released from the cylinder it becomes a gas (Change A), and then it burns (Change B). Which of the following is true?

a)

Process A is a Physical Change

b)

Process B is a Chemical change

c)

Both processes A and B are chemical changes

d)

Both (a) and (b) are True

12.

Anaerobic bacteria digest the animal waste and produce biogas (Change A). The gas is burnt as fuel (Change B). The following statements pertain to these changes. Choose the correct one.

a)

Process A –Physical Change

b)

Process B- Chemical change

c)

Both process A and B are chemical changes

d)

Both process A and B are physical change

13.

A physical change is named as such because __________.

a)

it involves changes in physical properties of a substance

b)

it is accompanied by a transfer of energy

c)

it is a reversible process

d)

it involves the formation of new products

14.

A change in which the original substance can be regained by a change in conditions is called _____________.

a)

a reversible change

b)

a physical change

c)

a chemical change

d)

both (a) and (b)

15.

Expansion on heating and contraction on cooling of metals are examples of ___________.

a)

chemical changes

b)

physical changes

c)

irreversible changes

d)

permanent changes

16.

Melting and boiling point are ______________ properties of a substance.

a)

physical

b)

chemical

c)

structural

d)

external

17.

“Adding salt to water changes the taste of water.” Which of the following statements is true regarding this change?

a)

It is a chemical change because a new substance is formed.

b)

It is a physical change because the original substance can be recovered

c)

It is a chemical change because the salt cannot be recovered.

d)

It is a physical change because there is a slight change in colour.

18.

Pooja took a candle in a vessel and heated the vessel. Even though the candle did not burn, it changed its shape and state. What kind of change is this?

a)

Irreversible change

b)

Physical change

c)

Chemical change

d)

Permanent change

19.

Which of the following is a physical change?

a)

Burning of kerosene

b)

Lighting an electric bulb

c)

Heating sugar in a pan

d)

Heating sulphur with iron filings to a red-hot state

20.

On the basis of the following diagrams/pictures, answer the question given thereafter. Which of the following changes represent a chemical change?

a)

Only (i)

b)

Only (ii)

c)

(i) and (ii)

d)

Neither

21.

A change that results in the formation of new chemical substances

a)

chemical change

b)

physical change

22.

Most chemical changes cannot be reversed.

a)

True

b)

False

23.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
24.
A change where one or more new substances are created.
a)
Physical Change 
b)
Chemical Change 
25.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
26.
Which of these is a result of a chemical change?
a)
A mixture
b)
A solution
c)
A new substance
d)
Melting or freezing
27.
Which of the following indicates a chemical change?
a)
Change in state of matter
b)
Temperature change
c)
Change in size 
d)
Change in shape
28.
Physical or Chemical Change?  Iron rusts
a)
Physical Change
b)
Chemical Change
29.
Physical or Chemical Change?  Cutting an orange into wedges.
a)
Physical Change
b)
Chemical Change
30.
Physical or Chemical Change?  Making a paper airplane.
a)
Physical Change
b)
Chemical Change
31.

The formation of a solid when two liquids combine is called?

a)

Solidification

b)

Freezing

c)

Precipitate

d)

Solubility

32.

The following are examples of evidence of a chemical reaction....

a)

ice melting into a liquid

b)

condensation

c)

endothermic reaction

d)

change in color, production of gas bubbles

33.

Which is NOT evidence of a chemical change?

a)

Unexpected color change

b)

gas produced

c)

breaking

d)

light produced

34.

Which is NOT evidence of a chemical change?

a)

Unexpected color change

b)

gas produced

c)

melting

d)

temperature change

35.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
36.

Which of the following options provides evidence of a CHEMICAL change?

a)

Wood is burned releasing ash and smoke

b)

Rocks separate when soil is sifted

c)

Boiling water bubbles when heated

d)

Salt dissolves in water

37.

A new substance is formed during which type of change?

a)

Physical Change

b)

Chemical Change

38.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

39.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

40.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
41.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
42.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
43.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
44.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
45.
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
46.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
47.
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. 
48.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
49.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
50.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
51.
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
52.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
53.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
54.
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
55.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
56.

The two sides of a chemical equation are called?

a)

Reactants (left) and Products (right)

b)

Ingredients (left) and Product (right)

c)

Cations and Anions

d)

Reactants (left) and Results (right)

57.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
58.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
d)
Left side is balanced
59.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
60.
Which side of a chemical equation is the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
61.
Which problem is balanced?
a)
PbO2 + 2H2--> H2SO4
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
2Na + 2H2O --> 2NaOH + H
62.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
63.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
64.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
65.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
66.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
67.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
68.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
69.
Finish a blalanced equation:
Mg(OH)2 --> __________
a)
Mg(OH)2 --> MgOH
b)
Mg(OH)2 --> MgO+ H2O
c)
Mg(OH)2 --> MgO+ H2
d)
Mg(OH)2 --> Mg+ H2O
70.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)
 P4+ 2 O2 --> 3 P2O3
71.
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
72.
Balance this equation,            
Al2O3 --> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2 
c)
2Al2O3--> 4Al+3O2 
d)
3Al2O3--> 2Al+O2 
73.
Which elements are(is) not balanced?
LiNO3 +CaBr2 --> Ca(NO3)2 +  LiBr   
a)
Li
b)
Ca and Li
c)
O and N
d)
Ca
74.
Which of the following has the most number of O?
a)
2Mg3(PO4)2
b)
4AlPO4
c)
3Al(NO3)3
d)
15KOH
75.
Balance the equation:
Si(OH)4+NaBr--> SiBr4+NaOH
a)
Si(OH)4+2NaBr--> SiBr4+NaOH
b)
Si(OH)4+4NaBr--> SiBr4+4NaOH
c)
Si(OH)4+NaBr--> SiBr4+4NaOH
d)
Si(OH)4+2NaBr--> SiBr4+2NaOH
76.
N2 + H2 = NH4
a)
Balanced
b)
Unbalanced
77.
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. 
78.
Balance this equation:
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
79.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
80.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
81.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
82.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
83.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
84.
Name the part in red:

_2_H2 + _1_O2 -> _2_H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
85.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
86.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
87.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
88.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
89.
Is the following equation balanced or unbalanced ? 
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
90.
Is the following equation balanced or unbalanced ? 
N2 +3 H2 --> 2NH3
a)
Balanced
b)
Unbalanced
91.
How many hydrogens are in 4H2O?
a)
6
b)
8
c)
2
d)
4
92.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
93.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
94.
What are the coefficient used to balance the equation below?
__Ag2O →__ Ag +___O2
a)
2,4,1
b)
1,1,1
c)
2,1,2
d)
2,2,2
95.
How many Oxygen atoms are in 4H2O?
a)
4
b)
1
c)
0
d)
8
96.
 Balance this equation:

__ Al + __ HCl → __ H2 + __ AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
97.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
98.
Phase change from a solid to a gas.
a)
sublimation
b)
deposition
c)
condensation
d)
evaporation
99.

Lemon juice has a pH of about 2. What can you conclude about its acidity?

a)

It is acidic.

b)

It is alkaline.

c)

It is neutral.

d)

It is not possible to determine.

100.

If a substance has a pH of 9, is it acidic, alkaline, or neutral?

a)

Acidic

b)

Alkaline

c)

Neutral

d)

It depends on the substance

101.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
102.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
103.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
104.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
105.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
106.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
107.
Complete the sentence.
A substance that is more basic has a _____ pH than a substance that is acidic.
a)
lower
b)
higher
c)
the same
d)
none of the above
108.

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

a)

Both of the solution are Bases

b)

Both of the solution are Acids

c)

The Baking soda is an acid and the Bleach is a base

d)

The baking soda is a base and the Bleach is an Acid.

109.

A base is a substance

a)

That releases OH- ions when dissolved in water

b)

That releases H+ ions when dissolved in water

c)

Does not release any ions when dissolved in water

d)

None of the above

110.

A pH of 3 is how many times more acidic than a pH of 5?

a)

2

b)

20

c)

10

d)

100

111.
On the pH scale higher numbers indicate
a)
acids
b)
bases
112.
If you have a substance with a pH of 7.1 it is a(n).....
a)
Acid
b)
base
113.

The picture below shows the relative concentrations of H+ and OH- in a solution. Is the solution an acid or a base?

a)

acid

b)

base

114.

An acid

a)

is a substance that releases H+ ions when dissolved in water

b)

is a substance that does not release any ions when dissolved in water

c)

is a substance that releases OH- when dissolved in water

d)

releases an equal amount of OH- and H+ ions when dissolved in water

115.

Water has a neutral because

a)

it has more H+ ions than OH-

b)

it has more OH- ions than H+

c)

it does not produce any ions

d)

it has an equal amount of H+ and OH- in solution

116.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
117.
Bleach is a strong base, what is the pH level of bleach?
a)
13
b)
14
c)
1
d)
2
118.
A solution has a pH of 7.0.  What would happen to the pH if H ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
119.
A solution has a pH of 7.0.  What would happen to the pH if OH ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
120.
A solution with a pH of 10 is mixed with a solution with a pH of 4.  What would the pH of the mixture most likely be?
a)
10
b)
4
c)
40
d)
7

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