Which of the following are physical changes and which are chemical changes ?Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.

Academic Chemistry NCERT Class 9

Physical change	Melting of candle wax, mixing of iron filings and sand, breaking of chalk, and cutting of paper.
Chemical change	Burning of candle wax, burning of wood, and burning of paper.

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Updated on: 10-Oct-2022

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Which of the following are chemical changes?(a) Growth of a plant (b) Rusting of iron(c) Mixing of iron filings and sand (d) Cooking of food(e) Digestion of food (f) Freezing of water(g) Burning of a candle.
Which type of flame will be produced by burning piece of paper and why?
Which of the following does not involve a chemical reaction?(a) digestion of food in our body(b) process of respiration(c) burning of candle wax when heated(d) melting of candle wax on heating
Which of the following are physical changes and which are chemical changes?(a) Burning of a magnesium wire(b) Freezing of water(c) Rusting of iron(d) Glowing of an electric bulb
Look at figure 6.1 which shows three situations(a) a burning candle(b) an extinguished candle(c) melting wax."
The burning of paper is a/an ________.
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(a) Give the main difference between physical changes and chemical changes.(b) Which of the following are chemical changes and which physical? Give reason.(i) a glass bottle breaking(ii) coal burning in air(iii) making a cake(iv) wool being knitted into a sweater
Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
Why is a candle made of wax?
When We Put Burning Candle Near The Mouth Of Test Tube Consisting Of Sulphuric Acid And Piece Of Magnesium Metal. Why Does It Explode ?
Which of the following are chemical changes?(i) decaying of wood(ii) burning of wood(iii) sawing of wood(iv) hammering of a nail into wood(a) (i) and (ii) (b) (ii) and (iii)(c) (iii) and (iv) (d) (i) and (iv)
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\n22989"
Which of the following are chemical changes?Decaying of woodBurning of woodSawing of woodHammering of a nail into a piece of wood(a) (i) and (ii)(b) (ii) and (iii)(c) (iii) and (iv) (d) (i) and (iv)
Why the flame of burning LPG gas is blue in colour, and the flame of a burning candle is orange and yellow?

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