I think that the answer is A because if you think about water for an example. When water turns into ice, it's still technically water, just the molecules are frozen. The water is physically changed. It could also see why you think it is B but I don't think so completely. It doesn't really make sense to me. So I'd choose A. It's definitely not C or D.
Temperature. Water is an example. When water is at room temp. its liquid. When water is at boiling temp. It is a gas. And when water is at freezing temp. Its a solid.
Answer:
They form Calcium sulphate and water.
Explanation:
H2SO4 + Ca(OH)2 ----> CaSO4 + 2H2O
Acid + Alkali ---> Salt + Water.
Answer: membrane and cell wall
Explanation: this is because the cell wall is only known to happen in plant cells and a membrane is in both plant and animal cells so it is most likely membrane and cell wall.
The answer is x = 2.6 x 10^24. Hope this helps. :)
