ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

 Fill in the blan

An ________ is a homogeneous mixture of two or more metals.

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Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.

Name the technique that you use if only the solid component of a solution is required.

Define matter.

Define matter.

Differentiate between an atom and a molecule.

Differentiate between an atom and a molecule.

What do you observe when :

a piece of paper is burnt

What do you observe when :

solid ammonium chloride is heated

What do you observe when :

an iron nail is kept in tap water for few days

What do you observe when :

a spoon of sugar is heated in a pan

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A new substance is always formed in a _______ change.

Fill in the blank.

Melting of ice is a _______ change.

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Burning of fuel is a _______ change.

State whether the following is physical or chemical changes.

burning of wood -

State whether the following is physical or chemical changes.

passing electric current through a heater rod —

State whether the following is physical or chemical changes.

Melting of wax —

State whether the following is physical or chemical changes.

Boiling of an egg — 

Tick (√) the correct alternative from the choice given for the following statement

Burning is a

Tick (√) the correct alternative from the choice given for the following statement

When sugar is heated, its colour changes into