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What is meant by a pure substance?...

What is meant by a pure substance?

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### Step-by-Step Solution: 1. **Definition of Pure Substance**: A pure substance is defined as a material that has a uniform and definite composition. This means that it consists of only one type of particle, which can be either an element or a compound. 2. **Types of Pure Substances**: Pure substances can be classified into two categories: - **Elements**: These are substances that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O), hydrogen (H), and gold (Au). - **Compounds**: These are substances formed when two or more elements are chemically bonded together in a fixed ratio. An example of a compound is water (H₂O), which is made up of hydrogen and oxygen. ...
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Knowledge Check

  • Which of the following is likely to be a pure substance?

    A
    A colourless liquid that boils over the range of temperature from `70^(@)C` to `80^(@)C`
    B
    A green solid which starts to melt at `80^(@)C` and is completely melted at `90^(@)C`
    C
    A white solid which produced a chromatogram consisting of only one spot
    D
    A brown liquid that is completely miscible with water.

  • ___ is a pure substance.

    A
    Air
    B
    Sugar solution
    C
    Methane
    D
    Milk

  • Which of the following is not a mixture but a pure substance?

    A
    CNG (compressed natural gas)
    B
    LPG (liquefied natural gas)
    C
    Distilled water
    D
    Kerosene

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    A mixture whether homogeneous or heterogeneous cannot be a pure substance. Explain.

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