Chemical Changes
Chemical Changes: Overview
This Topic covers sub-topics such as Chemical Reactions, Chemical Equations, Chemical Changes, Reaction of Vinegar with Baking Soda, Burning of Magnesium Ribbon, Reaction of Copper Sulphate with Iron and, Burning of camphor
Important Questions on Chemical Changes
Browning of fruits and vegetables can be prevented by:
_____ acid prevents browning of fruits and vegetables.
Cod water prevents the browning of fruits and vegetables.
_____ disappears without leaving any residue.
_____has a strong smell which keeps insects and flies away.
The burning of camphor is an example of:
On burning camphor, it evaporates without passing through a liquid state.
One example where supplying light energy is necessary for a chemical reaction is:
Calcium oxide reacts with water to form calcium hydroxide along with the evolution of heat is an example of _____ reaction.
Two non-metals react sometimes explosively when brought in close contact.
The silver residue obtained on heating mercury (II) oxide is mercury. This is an example of a decomposition reaction.
On heating green copper carbonate changes to _____ copper oxide. (black/yellow)
Cooking of rice is a physical change.
A single arrow indicates _____ in which reaction proceeds.
Do all the chemical reactions proceed with the same condition(s) provided to them?
Do the same reactants combine to form the same products?
Reddish-brown layer on the surface of iron is:
Why is it advised not to leave an apple in the open after cutting it?
Which gas is released when sodium carbonate and diluted hydrochloric acid react?
