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6 questions · timed · auto-graded

Question 12 Marks
What happens when cane sugar is strongly heated? Mention any two changes in it.
Answer
1. Sugar is basically Sucrose.
2. The molecular formula of Sugar is $C _{12} H _{22} O _{11}$ (or) $C _{12}\left( H _2 O \right)_{11}$.
3. When sugar is heated, it loses all water molecules and decomposes to carbon.
4. Chemical change;
5. Irreversible change
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Question 22 Marks
When a candle is lit the following changes are observed.
  1. Wax melts.
  2. Candle keeps burning.
  3. The size of the candle decreases.
  4. The molten wax solidifies
  5. Which of the changes can be reversed? Justify your answer
Answer
  1. Wax melting is a reversible change.
  2. “The molten wax solidifies” is a reversible change.

These two changes can be reversible to get back to the original state. So the above two changes are reversible changes.

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Question 32 Marks
Water is the universal solvent. Why?
Answer
Water is known as the universal solvent. It dissolves a wide range of substances.
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Question 42 Marks
What is melting? Give example.
Answer
The conversion of a solid into a liquid by heating is called melting. Ex.: Ice into water.
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Question 52 Marks
What is a reversible change?
Answer
Changes which can be reversed (to get back to the original state) are known as reversible changes.
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Question 62 Marks
What is the change?
Answer
Change is the observable difference between the initial state and the final state of any substance.
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[ 2 Marks Questions ] - Science STD 6 Questions - Vidyadip