Is it true that in a physical change the makeup of matter is changed?

Answer 1

No. An example of a physical change is cutting up a carrot. Physical changes occur when the shape of the substance or the state (gas, liquid, solid) of it change. In the example, the carrot's shape is changed (1 piece to many pieces), so it's a physical change. The composition never changes.

Answer 2

When the "state" of matter changes its physical properties also changes.

Solids have definite volume and shape.

Liquids have definite volume but do not have definite shape.

Gas do not have definite volume or definite shape.

However, the chemical properties of a substance are not altered by a physical change, except that reactions may proceed at a different rate (for example, crushed coal or atomized gasoline).

Answer 3

No. A physical change is a change in somethings size, color, texture, mass, volume...etc. A substance going through a physical change remains the same substance at the end. A chemical change changes composition.

Answer 4

I cannot recall if there is an exception, but elemental matter can generally take one of three physical states without undergoing a chemical change. An element can be a gas, liquid or solid depending upon its temperature and as long as it is not in the presence of other reactive elements or molecules. I am unclear on how this might play with all molecular structures, but a great many obey the same idea. For instance, CO2 becomes the solid we know as 'dry ice' when cold enough without a chemical change.

Hydrogen in any state would be very unstable in the presence of oxygen, especially when heated. Both elements are highly reactive; they like to combine with things. In purest form, there would be no concern with hydrogen until it became hot enough to 'fuse' into helium. This is the very process going on in the sun and it takes a great deal of heat to cause it to happen!!

Answer 5

Chemical change. In the process of a chemical change, the composition (particle), is changed into a new substance, with different particles. Example of a chemical change is Burning wood because the wood after burnt is turned into Ashes. A new substance.

Answer 6

No, it is false. In a physical change, in a chemical change the make up changes. Think of a physical change as cutting a cake: even after you cut it, it is still a cake!

Answer 7

A chemical change involve a change of composition.

Answer 8

no