Classify the following as chemical or physical changes:
cutting of trees,
melting of butter in a pan,
rusting of almirah,
boiling of water to form steam,
passing of electric current, through water and the water breaking down into hydrogen and oxygen gas,
dissolving common salt in water,
making a fruit salad with raw fruits and
burning of paper and wood.

Academic Chemistry NCERT Class 9

Physical changes	Chemical changes
cutting of trees, melting of butter in a pan, boiling of water to form steam, dissolving common salt in water, making a fruit salad with raw fruits	rusting of almirah, passing of electric current, through water and the water breaking down into hydrogen and oxygen gas, burning of paper and wood

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Updated on: 15-Mar-2023

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Separate the following into physical and chemical changes :Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water.
Classify the following as physical or chemical changes :(i) Cooking of food(ii) Boiling of water(iii) Cutting of trees(iv) Dissolving salt in water(v) Digestion of food(vi) Melting of ice
Which of the following is not a physical change?(a) Boiling of water to give water vapour(b) Melting of ice to give water(c) Dissolution of salt in water(d) Combustion of Liquefied Petroleum Gas (LPG)
What is the correct order of the methods you would apply to separate the components of a mixture of ammonium chloride, common salt and sand ?(1) dissolving in water, filtration, evaporation and sublimation(2) dissolving in water, evaporation and sublimation(3) sublimation, dissolving in water, filtration and evaporation(4) moving a magnet, dissolving in water and sublimation
Dissolving sugar in water is a physical or chemical change.
Through which of the following materials can sound travel? wood, air, water, steam, ice, hydrogen, steel, diamond.
How boiling of water is a physical change?
Which condition out of the following will increase the evaporation of water?(a) Increase in temperature of water.(b) Decrease in temperature of water.(c) Less exposed surface area of water.(d) Adding common salt to water.
Hydrogen and oxygen combine in the ratio of 1: 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?
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"
If there is a shortage of water then why don't scientists mix hydrogen and oxygen to make water?
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
Classify each of the following as a homogeneous or heterogeneous mixture: soda water, wood, air. soil, vinegar, filtered tea.
(a) State the main points of difference between homogeneous and heterogeneous mixtures.(b) Classify the following materials as homogeneous mixtures and heterogeneous mixtures :Soda-water, Wood, Air, Soil, Vinegar, Alcohol and water mixture, Petrol and water mixture, Chalk and water mixture, Sugar and water mixture, Copper sulphate solution.
If a fresh egg is put into a beaker filled with water, it sinks. On dissolving a lot of salt in the water, the egg begins to rise and then floats. Why?

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