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प्रश्न
Give two examples for the following case:
Chemical changes
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उत्तर
- Burning of paper
- Curdling of milk
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संबंधित प्रश्न
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
Fill in the blank
A new substance is always formed in a _______ change.
Complete the statement by filling the gap using an 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)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
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)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
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)
Electron ______ is complete in each hydrogen in a hydrogen molecule.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
______ is a natural indicator.
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
______ is the chemical name of slaked lime.
