How are physical and chemical changes different in two ways?

Answer 1

a physical change can be reversed but a chemical changes is not. you can all tell the different from a physical and chemical change by seeing if the color or if the substances is still in it normal element and it a chemical change if it has been change to a new substances like a burn paper change to Ashes. It is all most a physical change but it can not be reversed back.

Answer 2

Physical change does not produce a new substance. Chemical change produces a new substance
In a chemical change the atoms/molecules are chemically joined together so they are very hard to separate. were as they are easyer to separate in a physical change

Answer 3

is painting a room physical or chemical

wow...stupid people like these get annoying sometimes... (the guy who posted the previous answer)

a chemical change is when two or more compounds come together to form a completely new thing. a physical change is when you change the shape of something.

for example, ripping a piece of paper is a physical change, and the bonding of 2 hydrogen molecules and one oxygen molecule to form water is a chemical change.

because physical can be reversed, as the other answer says, a chemical change is a new thing altogether, it can not be reversed.

Answer 4

it is important to understand the difference between chemical and physical changes. The two types are based on studying chemical reactions and states of matter. We admit that some changes are obvious, but there are some basic ideas you can use. Physical changes are about energy and states of matter. Chemical changes happen on a molecularlevel.

When you step on a can and crush it, you have forced a physical change. The shape of the object has changed. It wasn't a change in the state of matter, but something changed. When you melt an ice cube you have also forced a physical change (adding energy). That example caused a change in the state of matter. You can cause physical changes with forces like motion, temperature, and pressure.

Chemical changes happen on a much smaller scale. While some experiments show obvious chemical changes such as a color change, most chemical changes happen between molecules and are unseen. When iron (Fe) rusts you can see it happen over a long period of time. The actual molecules have changed their structure (the iron oxidized). Melting a sugar cube is a physical change because the substance is still sugar. Burning a sugar cube is a chemical change. The energy of the fire has broken down the chemical bonds.

Some changes are extremely small. Chemical changes can happen over a series of steps, and the result might have the same number of atoms but have a different structure. The sugars glucose, galactose, and fructose all have six carbon atoms, twelve hydrogen atoms, and six oxygen atoms. Even though they are made of the same atoms, they have very different shapes and are called structural isomers. They each have different chemical reactions because of their molecular structure.

Answer 5

chemical change result in new substances, while physical changes do not.

Answer 6

Physical Changes are when something is plane

Chemical Changes are when something is added into something to make something._ By: Malachaii Cain

Answer 7

Physical change does not change the substance.

Chemical change does change the substance.

Answer 8

they are different because physical has different reactions to salt water than chemical.

Answer 9

A physical change is reversible, however, chemical changes are reversible.