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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

A Physical Change is Temporary. Explain. - Chemistry

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प्रश्न

A physical change is temporary. Explain.

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उत्तर

A physical change is defined as a change in which no new substance is formed.
A physical change is temporary because this change can be easily reversed by reversing the conditions. For example when ice is melted, it gets converted into water by absorbing heat. Water so formed can be easily converted to ice by cooling thus heat is released. Thus physical change is temporary.

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पाठ 2: Physical and Chemical Changes - Additional questions 8

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 2 Physical and Chemical Changes
Additional questions 8 | Q 2

संबंधित प्रश्‍न

Classify the following as chemical or physical change:

Burning of paper and wood


 Write short answer.

Give an example of desirable change which can also be undesirable


 Write short answer.

What are man-made changes ?


Name a chemical change which takes place in presence of:


Fill in the blank with the appropriate word of the statement  given below:

If a change is permanent and irreversible it is considered a _________ change.


Give the reason why the following is considered as chemical changes.

A bright light is seen evolved when a strip of magnesium is heated.


Physical Change: Boiling::Chemical Change: ______.


State whether the following statement is true or false:

Anaerobic bacteria digest animal waste and produce biogas.


Match the items of Column I with the items of Column II.

Column I Column II
(a) Large crystals (i) Turns lime water into milky
(b) Depositing a layer of zinc on iron (ii) Physical change
(c) Souring of milk (iii) Rust
(d) Carbon dioxide (iv) Sugar candy (Mishri)
(e) Iron oxide (v) Chemical change
(f) Dissolving common salt in water (vi)  Galvanisation

Fill in the blanks in the following statements using the words given in the box.

rusted, colourful, substance, chemical, physical, reversible, iron oxide, object
  1. Making sugar solution is a ______ change.
  2. A physical change is generally ______.
  3. Grinding of wheat grain changes its size. It is a ______ change.
  4. Iron benches kept in lawns and gardens get ______. It is a ______ change because a new ______ is formed.

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