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प्रश्न
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
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उत्तर
Melting of ice, melting of butter
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संबंधित प्रश्न
Define catalyst.
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Rusting of iron is a ______ chemical change.
When electric current is passed through acidulated water ______ of water takes place.
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
________ is a chemical substance which alters the speed of a chemical reaction.
What are the chemical reactions that occur in everyday life?
