Advertisements
Advertisements
Question
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Solution
(a) It is a chemical change in which new substances are formed.
(b) Calcium oxide when dissolved in water, forms a basic solution.
\[\ce{CaO + H2O -> (OH)2}\]
Carbon dioxide when dissolved in water, forms an acidic solution
\[\ce{CO2 + H2O -> H2CO3}\]
APPEARS IN
RELATED QUESTIONS
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 |
How is a strong electrolyte different from a weak electrolyte?
When electric current is passed through acidulated water ______ of water takes place.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
A chemical reaction is often accompanied by external indications or characteristics.
Circle the odd one out. Give reason for your choice
What happens when cane sugar is strongly heated? Mention any two changes in it.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
Give an example where heat, light, and sound are produced during a chemical change.
