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प्रश्न
Explain the following giving an example.
Pure substance
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उत्तर
- A pure substance is defined as one that contains only one type of atom or molecule.
- A pure substance has the same colour, taste and texture at any given temperature and pressure and a fixed melting and boiling point under continuous pressure.
- Examples include hydrogen gas, salt chloride, and water.
संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
Photosynthesis cannot take place at night.
Write short answer.
Give two examples of periodic changes
Write true or false
Burning of paper and formation of curd are reversible changes.
Write true or false
Decomposition of leaves is a fast change.
Give the main differences between physical changes and chemical changes.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
