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प्रश्न
Define a pure substance. How many types of pure substances do you know?
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उत्तर
Pure substances: “A substance of a definite composition which has consistent properties throughout, is called a pure substance” Types of pure substances: Pure substances are of two types
(i) Elements
(ii) Compounds
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संबंधित प्रश्न
Define: Compounds
Give two examples of Metalloids.
Give two examples of the following.
Non-metals which are solids
Tick (√) the correct alternative from the choice given for the following statement.
The most abundant elements in the universe are
Give the name of the radical - NO3
Give the name of the radical - CO3
Complete the statement given below by filling in the blanks with the correct words.
From the elements – He, Br, Pt, and O; the element which is metallic is ____, an inert element is ____, forms a triatomic molecule is ____, is liquid at room temperature is_ ___.
Elements are the______ form of pure substances.
Match the following:
| 1. | Co2 | a. | Robert Boyle |
| 2. | Sulfur | b. | Making mobile phones |
| 3. | Element | c. | triatomic molecule |
| 4. | Gallium | d. | Polyatomic molecule |
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
