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What is the difference between dissolution of sugar and burning of sugar ? - Science

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प्रश्न

What is the difference between dissolution of sugar and burning of sugar ?

संक्षेप में उत्तर
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उत्तर

1. Dissolution of sugar:

  1. When sugar is dissolved in water it disappears. It we taste the solution, the sugar is still present in dissolved form.
  2. If water is evaporated we get back the sugar.
  3. So it is a physical and reversible change.

2. Burning of sugar:

  1. Fire activates a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar as the chemical bonds broke.
  2. Energy is released in the form of smoke.
  3. So, burning a sugar is a chemical change.
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अध्याय 3: Changes Around Us - Evaluation [पृष्ठ ५४]

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सामाचीर कलवी Science - Term 2 [English] Class 7 TN Board
अध्याय 3 Changes Around Us
Evaluation | Q VIII. 5. | पृष्ठ ५४

संबंधित प्रश्न

Tick the most appropriate answer.

3. Physical changes are

  1. permanent.
  2. periodic,
  3. temporary
  4. irreversible.

True or false 

Change of seasons is a non-periodic change. 


Make a list of different types of changes with example.


Which of the following are physical changes ?

  1. melting of iron metal
  2. rusting of iron metal
  3. bending of an iron rod
  4. drawing a wire of iron metal

Classify the following as a physical or a chemical change.

Burning of coal


Fill in the blank.

The process of a liquid changing into a solid is called ________


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.


Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.

  1. Is the above change physical or chemical?
  2. Name the residue which remains behind after the salt solution is boiled.
  3. Is the change reversible or not reversible?
  4. Are the composition and properties of the original substance altered?
  5. Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.

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

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