ICSE Worksheet for chapter-5 Physical And Chemical Changes class 9

ICSE Worksheet for chapter-5 Physical And Chemical Changes class 9

Worksheet For class 9

Find ICSE Worksheet for chapter-5 Physical And Chemical Changes class 9

CLASS-9

BOARD: ICSE

Chemistry Worksheet - 5

TOPIC: Physical And Chemical Changes

For other ICSE Worksheet for class 9 Science check out main page of Physics Wallah.

PHYSICAL AND CHEMICAL CHANGES

SUMMARY –

• Definition and comparison between physical and chemical changes.
• Different types of chemical changes –
  1. Combination.
  2. Decomposition.
  3. Displacement.
  4. Double decomposition.
  5. Catalytic reaction.
  6. Reversible reaction.
  7. Thermal dissociation.
  8. Oxidation – reduction.
• Energy changes in a chemical change –
  1. Exothermic.
  2. Endothermic.
  3. Photochemical.
  4. Electrochemical.
• Burning and respiration.

SECTION -1

1. State whether the following changes are physical or chemical changes. Give one reason for your answer.
   1. Sugar dissolves in water.
   2. Milk sours in hot and humid weather.
   3. Anhydrous copper sulphate (white in colour), turns blue, when a drop of water is poured over it.
   4. A glass tube softens, when heated.
   5. A rock rolls down a hill slope.
   6. A frog breathes heavily.
2. A person eats a chocolate and digests it. In doing so there takes place a physical and chemical change. Identify the changes and give reason for your answer.
3. 3.Which type are the following reactions :
   1. NH ₄ Cl → NH ₃ + HCl
   2. Cl ₂ + 2KBr → 2KCl + Br ₂
   3. 2HgO→ 2Hg + O ₂
   4. AgNO ₃ + NaCl → AgCl + NaNO ₃
   5. PbO ₂ + SO ₂ → PbSO ₄

SECTION -2

1. When iron filings is mixed with sulphur and the mixture is grinded , a physical change takes place. However, if we heat the mixture a chemical change takes place. Using the above example give four differences between physical and chemical change.
2. State or define the following reactions, supporting your answers by atleast two examples each.
   1. Chemical composition.
   2. Chemical decomposition.
   3. Chemical displacement.
   4. Chemical double-decomposition.
3. Compare the burning of carbon compounds with respiration. How is respiration similar to burning?
4. Give one example in each case :
   1. Combination reaction
   2. Decomposition reaction
   3. Substitution reaction
5. Give three examples in each case :
   1. Oxidizing agents
   2. Reducing agents
6. Give four characteristics of :
   1. Rusting of iron
   2. Digestion of food
7. A small piece of sodium is dropped into a beaker of water. Give two reasons why the reaction involves a chemical change.