Is there any change in mass when a substance changes its state ? Explain with example.

Is there any change in colour ?

Is there any change in the state of material ?

Do substances change their taste when cooked ?

How do you know that milk is changed into curd ?Is there any change in its state ? Is there any change in its volume ? Is there any change In the weight?

Is the pH changes tooth decay? Explain.

How can you change the state of a substance?

Which of the above substances changed red litmus to blue ?

How do the following properties change in group - 1 and in the third period? Explain with example. (d) Nature of oxides.

How do the following properties change in group - 1 and in the third period? Explain with example. (a) Atomic radius.