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प्रश्न
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Sand
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उत्तर
Silicon dioxide (Sand) — SiO2
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संबंधित प्रश्न
Give two examples for the following: Metals
Classify the following substances into compounds and mixtures:
Give two examples of the following.
Metals which are soft
Answer the following question:
Why are copper and aluminium used to make electric wires?
Indicate whether the following statement is true or false:
All elements are artificially prepared
Tick (√) the correct alternative from the choice given for the following statement
The most ductile metal.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
‘An atom is the basic unit of an element’. Draw a diagram of an atom – divisible as seen today.
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
Differentiate between elements and compounds.
