Types of Changes
Types of Changes: Overview
This topic covers concepts such as Chemical Changes, Chemical Reactions, Physical Changes, Melting of Wax, Periodic Changes, Earthquake, Combustion as a Change, Types of Changes around Us, Reversible Changes, Irreversible Changes, etc.
Important Questions on Types of Changes
Chicks hatching out of chicken eggs is an example of temporary change.
Chicks hatching out of chicken eggs is a non-desirable change.
Which of the following are a type of physical change.
Which of the following is a physical change.
Is sugar dissolving in water a physical change or chemical change?
Changes in which only _____ properties of a substance change are called physical changes.
Complete the table given below.
| Precautions to be taken during earthquakes | What damages can occur during an earthquake? | Precautions to be taken during the flood | What damages can occur during a flood? |
Where else have you seen chemical reaction?
| Where have you seen chemical reaction? | What were the changes due to the reaction? Mention change of colour and any other changes. | What was the result of such a reaction? |
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)
State whether the following statement is true or false. If false write the correct statement:
The occurrence of the earthquake is a periodic change.
What is a non-periodic change? Give two examples for it.
The change of season is a periodic change but the change of weather is non-periodic. Give reasons to your answer.
Cooking of rice is a physical change.
Which of the following is a physical change?
A single arrow indicates _____ in which reaction proceeds.
