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प्रश्न
Explain the term chemical reaction with special reference to reactants and products.
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उत्तर
A chemical reaction is a transformation in which matter transforms into one or more new compounds. Reactants are substances or substances that participate in a chemical reaction; these are changed into products, which are one or more new compounds.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
FILL IN THE BLANK
A .............. change is a temporary change.
MATCH THE COLUMNS
| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
Give an example of a reaction where the following are involved
Light
What do you observe when Cobalt chloride paper is introduced in water vapour.
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
A chemical reaction is often accompanied by external indications or characteristics.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Burning of paper is the best example of ______ change.
Write word equations for two chemical reactions with the help of materials given in the box.
| Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water |
