You accidentally dropped your favourite toy and broke it. This is a change you didi not want. Can this change be reversed?

Give examples to explain the difference between changes that can or cannot be reversed.

A drawing sheet changes when you draw a picture on it. Can you reverse this change?

How would the tendency to gain electrons change as you go down a group?

How does the atomic radius change as you go from left to right in a period ?

What change do you observe if you test soap with litmus paper?

How would you show that setting of curd is a chemical change?

A knife which is used to cut a fruit was immediately dipped into water containing drops of blue litmus solution. IF the colour of the solution is changed to red, what inference can be drawn about the nature of the fruit and why?

When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe