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प्रश्न
Define a pure substance. How many types of pure substances do you know?
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 the term: Element
Give one example for the following types of mixtures:
liquid-gas homogenous mixture
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Sand
Give two examples of Noble gases.
Find the atomicity of the Following molecule:
Calcium Chloride
Complete the statement with the correct words.
Acid’s are chemicals which are _____ in taste and derived from plants and ________.
Write the names of elements from the following symbol:
Si
State four differences between – elements, compounds and mixtures with suitable examples.
‘The modern periodic table consists of elements arranged according to their increasing atomic numbers’. With reference to elements with atomic numbers 1 to 20 only in the periodic table – differentiate them into – metallic elements, metalloids, non-metals & noble gases.
Higher Order Thinking Skills.
List out the metals, non-metals and metalloids which you use in your house, schools. Compare their properties.
