Chemical or physical channge??

Question

Are these two changes chemical or physical?

Sugar dissolving in water?

Phtosynthesis?

Answer 1

sugar dissolving in water is a physical change cuz the sugar breaks down but remain sugar(of very small size).any chemical properties of suger doesnt change, making it a physical change

but in photosynthesis the following occurs :

carbondioxide + water ----------> glucose + oxygen

     Co2          +   H20 ---------->C6H12O6 +    O2

in this case,

carbondioxide and water react to form two totally different compounds. here chemical change occurs.its a chemical change

Answer 2

i think the sugar dissolving is physical

i don't know about photosynthesis soz.

Answer 3

A physical change can in most cases be reversed (ripping paper, melting ice).  A chemical change typically causes a change that cannot be reversed (burning wood, cooking food)

Sugar dissolving in water - Physical change - you could seperate the sugar from the water if you wanted to by evaporating the water.

Photosynthesis - Chemical change - The plant is taking in the necessary chemical it needs to convert into food.

Answer 4

sugar dissolving in water is physical because the sugar physically changes and photosynthesis is chemical because the plant doesn't change just the chemicals in it do : )

Answer 5

Are they undergoing a chemical reaction or just a change in their physical state?  Think about it.