Question

1)Rani wants to find out whether the temperature of water makes any difference to the rate at which salt dissolves. She has planned 6 set ups P, Q, R, S, T and U.

Answer 1

$\rm\huge\underline{Answer}$

the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.

Answer 2

Answer: It is D

Explanation: It is D because as the salt and other ionic compounds like it will dissolve faster the hotter the water it is dissolved in So when the water is hot it will disolve fast

In S and U.

S has been added 200 ml and the temprature of the water is 50 and the amount of salt is 9 grams so it will disolve fast

U has also been added 200 ml and the temprature is also in 50 and the amount of salt is 6 grams so that will disolve faster