EASY
Earn 100

7g of iron filings and 4g of sulfur powder is heated strongly with dilute H2SO4. Which gas would be produced?

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Important Questions on Changes Around Us

EASY
Science>Chemistry>Changes Around Us>Classification of Changes
What is corrosion? 
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
What are the differences between a physical and a chemical change? 
HARD
Science>Chemistry>Changes Around Us>Classification of Changes
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
HARD
Science>Chemistry>Changes Around Us>Classification of Changes
Dissolution of a sugar cube in water is a physical change while burning a sugar cube is a chemical change. Why?
HARD
Science>Chemistry>Changes Around Us>Classification of Changes
Classify the changes involved in the following processes as physical or chemical changes:
(A) Photosynthesis
(B) Dissolving sugar in water
(C) Burning of coal
(D) Melting of wax
(E) Beating aluminium to make aluminium foil
(F) Digestion of food
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
What kind of change occurs when a pot is made from clay?
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
How would you show that setting of curd is a chemical change?
EASY
Science>Chemistry>Changes Around Us>Classification of Changes
What happens to the wax when we burn a candle? 
EASY
Science>Chemistry>Changes Around Us>Classification of Changes
What does the physical change mean?
EASY
Science>Chemistry>Changes Around Us>Classification of Changes

State two ways by which a change can be brought about.

HARD
Science>Chemistry>Changes Around Us>Classification of Changes
Cutting a potato is a physical change while cooking it is a chemical change. Explain how.
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
Anaerobic bacteria digest animal waste and produce biogas (Change — A). The biogas is then burnt as fuel (Change — B). The following statements pertain to these changes. Choose the correct one.
(i) Process — A is a chemical change.
(ii) Process — B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
Melting and freezing of wax are _____ changes. (physical / chemical)
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it?
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
Why is germination of a seed a chemical change?
EASY
Science>Chemistry>Changes Around Us>Classification of Changes
Select the material that undergoes the change.
  • A sheet of paper cut with a pair of scissors.
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
What kinds of changes occur when a candle burns?
EASY
Science>Chemistry>Changes Around Us>Classification of Changes

7g of iron filings and 4g of sulphur powder is treated with dilute H2SO4 at room temperature. Name the gas produced.

EASY
Science>Chemistry>Changes Around Us>Classification of Changes
What are physical and chemical changes? Give an example of each.
EASY
Science>Chemistry>Changes Around Us>Classification of Changes
What does chemical change mean?