Well, each ml of water requires one calorie to go up 1 degree Celsius, so this liter of water takes 1000 calories to go up 1 degree Celsius. (There are 1000 ml, each of which needs to have its temperature raised.)
Answer:
Yes, a chemical change occurs.
Explanation:

CaSO4 is insoluble in the water, so a chemical reaction or chemical change occurs.
It is called an indirect instance of watching, noticing, or making a statement. you might also be thinking of quiet and sneaky instance of watching, noticing, or making a statement but that is when you sense something that is below the point where something begins or changes of the senses.
I think it is D but im not sure
Answer: it’s b)
Explanation: that’s the only difference that is listed