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.

Academic Chemistry NCERT Class 9

Physical change	Sublimation of a solid, making a fruit salad from raw fruits, formation of clouds, and dissolution of carbon dioxide in water.
Chemical change	Decomposition of water into hydrogen and oxygen by passing electric current (electrolysis).

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Updated on: 10-Oct-2022

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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 andburning of paper and wood.
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
Explain The Following Lime Water turn Milky Or Passing Carbon Dioxide Gas Into
Mixing carbon dioxide into Lime water changes it to milky white. Why?
Convert into mole:(a) 12 g of oxygen gas(b) 20 g of water(c) 22 g of Carbon dioxide
Dissolving sugar in water is a physical or chemical change.
Can we reverse the following changes? If yes, suggest the name of the method.(a) Water into water vapour(b) Water vapour into water(c) Ice into water(d) Curd into milk
Write The Formula Of Carbon Dioxide And Water
Apart from carbon dioxide and water, name four other raw materials which are needed by the plants.
Which of the following raw materials is available in the air for photosynthesis?(a) Oxygen(b) Carbon dioxide(c) Nitrogen(d) Hydrogen
Explain the following:(a) Lime water turns milky on passing carbon dioxide gas into it.(b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.
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
When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of:(a) oxygen (b) carbon dioxide (c) nitrogen (d) water vapour
Choose the correct statement of the following(a) Conversion of solid into vapours without passing through the liquid state is called sublimation.(b) Conversion of vapours into solid without passing through the liquid state is called vaporisation.(c) Conversion of vapours into solid without passing through the liquid state is called freezing.(d) Conversion of solid into liquid is called sublimation.
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is1:12:14:11:2

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