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.
Advertisements
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
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
Give reason.
Acidic soil is treated with quick lime.
FILL IN THE BLANK
On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
Limestone contains ______ mainly.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
The chemical name of baking soda is sodium bicarbonate.
