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प्रश्न
Define chemical reaction.
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उत्तर
Any chemical change in matter that involves its transformation into one or more new substances is called a chemical reaction.
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
How do the following help in bringing about a chemical change?
pressure.
Give reason .
A person suffering from acidity is advised to take an antacid.
Write true or false :
Hydrogen sulphide has rotten egg smell .
Explain the following reaction with one suitable example of Decomposition reaction
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
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Explain by writing a word equation.
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Give an example of the following chemical change.
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Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
What do you understand by 'chemical reaction'?
Name: Gas with rotten egg smell.
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.
Give a word equation for the following reaction.
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Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
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Write a word equation for the chemical change, if any.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Chemical changes are important in our day-to-day life. Give examples.
