which one is a physical change grass growing or baking cake?

Question

which is a physical change and

Answer 1

Neither -
you cannot unbake a cake (like you cannot uncook and egg). you cant make the cake back into batter - if it were physical you could do that - its chemical

growing grass does not count at all - its a living thing, and there are so many levels of changes going on, it does not fit into this classification (there are both physical changes -increasing only size and mass - and chemical changes - photosynthesis - going on.

water freezing/melting is an example of a physical change. you can reverse it.

Answer 2

Neither, actually. In chemistry, a physical change is when a substance undergoes some form of change that does not change the substance at the molecular level (i.e. a chemical change). Physical changes do not create new substances, as in a chemical change, but result in the same substance in a different form or shape. A physical change in which a substance changes states between solid, liquid and gas is called a phase change. When water is frozen into ice it undergoes a phase change, and thus a physical change, as it is still water but in a different form. Under normal conditions physical changes can generally be considered reversible, however this does not always hold true. Other characteristics of physical changes include the absence of a newly created substance or the change is reversible. Water's change from liquid to solid is an example of a physical change. It is simply a change in appearance

Answer 3

Your teacher is pretty tough. Baking a cake more so than grass growing. If baking a cake is physical change, can you then "unbake" the cake?

Grass growing involves photochemical reactions -- changing light, CO2, and water into sugars. However, baking a cake, you are using heat to change how the starch molecules "fold". There is no chemical change. Same with cooking an egg.

Answer 4

grass growing. its chemical properties are not changing.

the cake baking is changing chemically because the cake is reacting to the heat, perminatly changing it from a batter to a bread-like substance.

Answer 5

The physical change is baking a cake. You are turning a liquid (mostly) into a solid (mostly). But to do it you are raising the heat to remove the liquid contents of the mixture.

Answer 6

baking cake

Answer 7

both are one in length and one in thinkness and the yeast makes it larger.

Answer 8

Neither.