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Worksheets

Language of Chemistry

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.
Which of these is NOT a reversible change?
a)
Water to Ice
b)
Juice to Popsicle
c)
Cookie Dough to Cookie
d)
Melting Chocolate
2.
Freezing juice is an example of a(n) ________
a)
physical change
b)
chemical change
3.
a)

PHYSICAL CHANGE

b)

CHEMICAL CHANGE

c)

REVERSIBLE CHANGE

d)

IRREVERSIBLE CHANGE

4.
a)

PHYSCIAL CHANGE

b)

IRRIVERSIBLE CHANGE

c)

REVERSIBLE CHANGE

d)

CHEMICAL CHANGE

5.

Is a burning candle a physical or chemical change?

a)

Physical

b)

Chemical

c)

BOTH

6.

Kajal left her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?

a)

chemical

b)

electrical

c)

thermal

d)

physical

7.
a)

PHYSICAL CHANGE

b)

CHEMICAL CHANGE

c)

REVERSIBLE CHANGE

d)

IRREVERSIBLE CHANGE

8.

An irreversible change is one in which---------

a)

The original substances can be obtained

b)

The original substances can sometimes be obtained

c)

The original substance cannot be obtained

d)

No new substance is formed

9.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
10.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
11.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
12.

Setting of curd from milk is __________________ change

a)

slow, chemical and irreversible

b)

fast, physical and reversible

c)

slow, physical and reversible

d)

slow, physical and reversible

13.

A teacher wants to show clear difference between physical and chemical changes, which one of the following will be suitable for the same

a)

boiling of milk and freezing it

b)

setting curd and making paneer

c)

melting ice and freezing it

14.

Folding of paper is a ____________ change while burning it is a _____________ change.

a)

physical, physical

b)

fast, physical

c)

physical, chemical

15.

In your opinion, growth of a virus (like COVID 19) is a fast or a slow change

a)

very fast

b)

very slow

c)

neither fast, nor slow

d)

moderate

16.

What is the valency of lead ?

a)

1,2

b)

5,7

c)

2,4

d)

1,4

17.

True or False: Law of conservation of energy states that matter can neither be created nor destroyed

a)

True

b)

False

18.

The valency of Chlorine in AlCl3 is

a)

1

b)

3

c)

2

19.

The molecular formula for Ammonium carbonate is

a)

(NH4 )2CO3

b)

(NH4 )CO3

c)

(NH4 )2CO

20.

What is the name of 13th element

(a)  

21.

Formula of baking soda

a)

NaHCO3

b)

Nacl

c)

H2SO4

22.

How many valence electrons are in an atom of Ar?

a)

2

b)

8

c)

4

d)

1

23.
valency of chloride ion is
a)
0
b)
+1
c)
-1
d)
2
24.

What is the molecular formula of acetic acid

(a)  

25.

sugar formula ?

a)

K2CO3

b)

Na3PO4

c)

C12H22O11

26.
What is the mass number defined as?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
27.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
28.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

29.

Which subatomic particle has a negative charge in the atom?

a)

proton

b)

neutron

c)

electron

d)

quark

30.
nitrate ion contains 
a)
nitrogen and oxygen
b)
Nitrogen only
c)
Nitrogen ,hydrogen and oxygen
d)
Sodium and nitrogen
31.
Which is not a property of matter?
a)
solid
b)
liquid
c)
gas
d)
ice
32.
What is a reversible change?
a)
Something you can change back.
b)
Something you cannot change back.
33.
Define chemical change
a)
An irreversible chemical reaction involving the rearrangement of the atoms of one or more substances
b)
A reversible reaction
c)
Chemicals become seperate
d)
I don't know
34.
Which is a chemical change?
a)
Breaking glass
b)
Baking a cake
c)
Shredding paper
d)
Melting ice
35.
Is heating sugar to make caramel a physical or chemical change?
a)
Chemical
b)
Physical
36.
Changing liquid to a gas is called
a)
evaporation
b)
condensation
c)
melting
d)
freezing
37.
What is happening in the statement below?
The ice cube melted.
a)
Matter is changing from a liquid to a solid.
b)
Matter is changing from a liquid to a gas.
c)
Matter is changing from a solid to a liquid.
d)
Matter is changing from a gas to a liquid.
38.
The picture shows an example of a ______________ change.
a)
chemical
b)
physical
c)
irreversible
d)
freezing
39.
When heat is added to a solid, it ______________.
a)
freezes
b)
evaporates
c)
melts
d)
condenses
40.
Which of these is a result of a physical change?
a)
A new odor
b)
A new gas
c)
A new chemical substance
d)
A solution
41.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
42.
One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?
a)
evaporation; chemical change
b)
condensation; physical change 
c)
evaporation; physical change
d)
condensation; chemical change
43.
Ms. Johnson gave all of her students a box of M&M's  but one of them was allergic to red dye.  What must the student do to make sure that the candy is safe for him to eat?
a)
Make a new mixture which is a physical change.
b)
Separate the mixture which is a physical change.
c)
 Make a new substance which is a physical change.
d)
Make a new substance which cannot be reversed.
44.
A student is creating a potting soil mix. She combines 100 grams of sand, 200 grams of soil, and 200 grams of pebbles to make her potting soil. What is the mass of the potting soil?
a)
100 grams 
b)
200 grams
c)
300 grams
d)
500 grams
45.
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
46.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
47.
Adding baking soda and vinegar together and it fizzes and creates carbon dioxide.
a)
Chemical
b)
Physical
48.

MELTING OF ICE IS WHAT CHANGE

a)

PHYSICAL CHANGE

b)

CHEMICAL CHANGE

49.

BURNING OF WOOD IS WHAT CHANGE

a)

PHYSICAL CHANGE

b)

CHEMICAL CHANGE

50.

CHEMICAL CHANGE IS REVERSIBLE

a)

TRUE

b)

FALSE

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