Physical and Chemical Changes Class 7 Worksheet with Answers

The Physical and Chemical Changes Worksheet for Class 7 is available here with both subjective and MCQ-type questions. Students are requested to complete this worksheet on Physical and Chemical Changes to test and improve their knowledge. At the end, we have also provided the answers so that students can check their mistakes and correct them.

This Physical and Chemical Changes Class 7 Worksheet with Answers is designed to help students understand the difference between physical and chemical changes in an easy way. The Class 7 science worksheet includes MCQ questions, short answer questions, and conceptual problems based on real-life examples. 

Students can download the Physical and Chemical Changes Class 7 Worksheet PDF and practice anytime. This Infinity Learn Physical and Chemical Changes Worksheet helps students test their knowledge, improve their understanding, and prepare well for exams with clear and accurate NCERT-based answers.

What is Physical and Chemical Change?

Physical Change

A physical change is a change where no new substance is formed. Only the shape, size, or state of matter changes. The substance remains the same even after the change.

Example:

• Melting of ice into water (it’s still water).
• Tearing a piece of paper.

Chemical Change

A chemical change is a change where a new substance is formed with different properties. It cannot be easily reversed.

Example:

• Burning of paper (new substances like ash and smoke are formed).
• Rusting of iron.

Also Check: Physical and Chemical Changes Class 7 Extra Questions 

Worksheet 1 – Physical and Chemical Changes Worksheet for Class 7

Choose the correct answer:

When water freezes into ice, it is an example of 
a) Chemical change
b) Physical change
c) Both a and b
d) None
Answer: b) Physical change

Burning of a candle involves 
a) Only physical change
b) Only chemical change
c) Both physical and chemical changes
d) No change
Answer: c) Both physical and chemical changes

Which of the following is a reversible change?
a) Cooking food
b) Burning wood
c) Melting butter
d) Rusting of iron
Answer: c) Melting butter

Formation of curd from milk is –
a) Physical change
b) Chemical change
c) Temporary change
d) Reversible change
Answer: b) Chemical change

When iron reacts with oxygen and moisture, it forms 
a) Rust
b) Water
c) Steam
d) Oil
Answer: a) Rust

Cutting vegetables is an example of 
a) Chemical change
b) Physical change
c) Irreversible change
d) None
Answer: b) Physical change

Which of these shows a chemical reaction?
a) Evaporation of water
b) Condensation of steam
c) Burning of paper
d) Freezing of water
Answer: c) Burning of paper

A new substance is always formed in 
a) Physical change
b) Chemical change
c) No change
d) Reversible change
Answer: b) Chemical change

Mixing iron filings and sand shows 
a) Physical change
b) Chemical change
c) Both
d) None
Answer: a) Physical change

Which process cannot be reversed easily?
a) Melting of wax
b) Boiling of water
c) Rusting of iron
d) Freezing of ice
Answer: c) Rusting of iron

Also Check: Physical and Chemical Changes Class 7 MCQs

Worksheet 2 – Subjective Questions

Answer the following in short:

Define a physical change with one example.
Answer: A physical change is a change where no new substance is formed, only the form or state changes.
Example: Melting of ice into water.

Define a chemical change with one example.
Answer: A chemical change is a change where a new substance is formed with new properties.
Example: Burning of wood.

Why is burning of a candle both a physical and chemical change?
Answer: When the wax melts, it’s a physical change, but when it burns to form carbon dioxide and water vapour, it’s a chemical change.

Write any two differences between physical and chemical changes.
Answer:

In physical change, no new substance is formed; in chemical change, a new substance is formed.

The changes of physical nature are mostly reversible; the changes of the chemical nature are mostly irreversible.

Explain why rusting is a chemical change.

Answer: Rusting forms a new substance (iron oxide) with different properties from iron, and it cannot be reversed easily.

Is dissolving sugar in water a physical or chemical change? Why?
Answer: It is a physical change because sugar can be obtained back by evaporating the water.

What happens when magnesium ribbon burns?
Answer: It burns with a bright white flame to form magnesium oxide, which is a new substance — hence, a chemical change.

Why is cutting an apple a physical change but its browning a chemical change?
Answer: Cutting changes only the shape (physical change), but browning happens due to a reaction with air, forming a new substance (chemical change).

Write two examples of reversible changes.
Answer:

• Melting of ice.
• Stretching of a rubber band.

Write two examples of irreversible changes.
Answer:

• Burning of paper.
• Cooking of rice.

Also Check: NCERT Solutions Class 7 Science Chapter 6

Worksheet 3 – Physical and Chemical Changes Class 7

When baking soda is mixed with vinegar, bubbles appear. This happens because 
a) A gas is formed during a chemical reaction
b) The temperature decreases
c) It’s a physical mixing of substances
d) Only a color change occurs
Answer: a) A gas is formed during a chemical reaction

A silver spoon turns black after some days. The black color appears due to 
a) Reaction of silver with water
b) Reaction of silver with air and sulfur compounds
c) Dust on the surface
d) Reaction of silver with carbon dioxide
Answer: b) Reaction of silver with air and sulfur compounds

When magnesium reacts with oxygen, it produces a bright light and a white powder. The white powder is 
a) Magnesium chloride
b) Magnesium oxide
c) Magnesium hydroxide
d) Magnesium carbonate
Answer: b) Magnesium oxide

A physical change can be identified by –
a) Formation of a gas
b) Change in color
c) Change in state without forming a new substance
d) Production of sound
Answer: c) Change in state without forming a new substance

Which of the following is not an example of a chemical change?
a) Rusting of iron
b) Ripening of fruit
c) Breaking of glass
d) Burning of wood
Answer: c) Breaking of glass

Which observation best proves that a chemical reaction has occurred?
a) Ice melts into water
b) Water evaporates into steam
c) Iron nail forms rust
d) Sugar dissolves in water
Answer: c) Iron nail forms rust

Which of the following is both exothermic and a chemical change?
a) Freezing of water
b) Burning of coal
c) Melting of wax
d) Evaporation of alcohol
Answer: b) Burning of coal

When a copper vessel is exposed to moist air for a long time, it gets a greenish layer because of 
a) Reaction with oxygen to form copper oxide
b) Reaction with carbon dioxide and water to form copper carbonate
c) Deposition of dust
d) Growth of algae
Answer: b) Reaction with carbon dioxide and water to form copper carbonate

Which of the following changes involves energy absorption?
a) Freezing of water
b) Condensation of steam
c) Melting of ice
d) Rusting of iron
Answer: c) Melting of ice

Heating ammonium chloride produces two gases which recombine on cooling. This is an example of 
a) Irreversible chemical change
b) Reversible physical change
c) Reversible chemical change
d) Temporary physical change
Answer: c) Reversible chemical change

Which of the following is the best evidence for a chemical reaction?
a) Change in size
b) Formation of a new colorless gas
c) Change in state
d) Evaporation
Answer: b) Formation of a new colorless gas

A metal “X” reacts with a blue solution of copper sulfate and forms a colorless solution. “X” is most likely 
a) Iron
b) Zinc
c) Aluminium
d) Silver
Answer: b) Zinc

If a piece of chalk is dipped in vinegar, bubbles appear due to the formation of 
a) Oxygen gas
b) Hydrogen gas
c) Carbon dioxide gas
d) Nitrogen gas
Answer: c) Carbon dioxide gas

Evaporation of alcohol from the skin causes a cooling effect because 
a) It absorbs heat from the surroundings
b) It releases heat to the skin
c) It reacts with oxygen
d) It changes chemically
Answer: a) It absorbs heat from the surroundings

When iron and sulfur are heated together, a black solid is formed. The new substance is 
a) A mixture of iron and sulfur
b) Iron sulfide, a compound
c) Sulfur oxide
d) Iron sulfate
Answer: b) Iron sulfide, a compound

Why Choose Infinity Learn Physical and Chemical Changes Class 7 Worksheet

Infinity Learn Physical and Chemical Changes Class 7 Worksheet is useful as it allows one to have fun while learning science and it is easy to understand.

• In this work sheet, there are questions as per NCERT, MCQ and subjective exercises to help test knowledge in an easy manner.
• It also explains tough concepts like reversible and irreversible changes, chemical reactions, and real-life examples in a clear manner.
• It also describes difficult concepts such as reversible and irreversible changes, chemical reactions as well as real life examples in a simple way.
• It assists in preparing school examinations and competitive tests because of better clarity of concepts, reasoning, and use, etc.
• By solving this Physical and Chemical Changes Class 7 Worksheet PDF, one can easily revise, check mistakes, and become more confident in Science.

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