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Class 7 Changes Around Us: Physical and Chemical worksheet
CBSE Science. Physical and chemical changes, the lime water test, combustion and the fire triangle, weathering. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
A change in which no new substance is formed is a:
- neutralisation
- combustion
- chemical change
- physical change
Answer
(d) physical change
- 2.
Which of these is a CHEMICAL change?
- souring of milk into curd
- grinding wheat
- deflating a balloon
- breaking glass
Answer
(a) souring of milk into curd
- 3.
Which of these is a PHYSICAL change?
- making popcorn
- rusting of iron
- dissolving sugar in water
- burning paper
Answer
(c) dissolving sugar in water
Section B · short answer
- 4.
What is the difference between a physical and a chemical change?
Answer
In a physical change no new substance forms; in a chemical change a new substance forms.
- 5.
Is it a "physical" or "chemical" change? (a) cooking an egg (b) baking soda fizzing with vinegar
Answer
(a) chemical (b) chemical
Section C · long answer
- 6.
Explain the physical and chemical changes in a burning candle.
Answer
Physical: the wax melts, flows down and some evaporates into wax vapour. Chemical: the wax vapour burns with oxygen, giving heat, light, carbon dioxide and water vapour. So a burning candle shows both kinds of change.
Fresh sheets for your child
In the app, every Changes Around Us: Physical and Chemical sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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