Chemical+and+Physical+Change

​Chemical Change - a change of one or more substances that creates something that wasn't there before.

Physical Change - any change in size, shape or state of matter in which the identity of the substance remains the same.


 * //One of the common defining factors for these two terms is can it be physically reversed. Ex. in a chemical change hydrogen and oxygen can be turned into H2O. You can't pick the oxygens or hydrogens off of these molecules. In a physical change with oxygen it can be condensed into a liquid at very low temperatures, but we can change it by heating back into a gas. If we heat the water we made it will vaporize enventually, but will still be H2O. Make sense?//**

Yes

Mercury:

Chemical Change - radioactive decay on the surface create some of the elements in Mercury's exosphere.

Physical Change - the ice that is assumed to be found in Mercury is supposed to have come from comets that had a lot of water on/inside of them

Venus:

Chemical Change - the sulfuric acid that rains down from the upper atmosphere is cause by a combination of 2 Hydrogen atoms, one Sulfur atom, and 4 Oxygen atoms. **//You can display this molecule like this H2SO4. Of course the numbers should be subscripted.//** Ok, thanks.

Earth:

Chemical Change - the Earth itself creates chemical change, for example a log burning in a forest fire, and on Earth, humans create chemical changes every day, even if they are doing something as simple as burning a bag of popcorn.

Physical Change - Earth produces physical changes every day, just by thing as simple as a could forming in the sky. Humans produce chemical changes every day even if it is something as simple as deflating a basketball.

Mars:

Chemical Change - the color of the surface of Mars is caused by rust, which is Iron (III) oxide. **//Do you know what the (III) means?//** I think the three is referring to the atoms, for example Fe2O3 ​ is iron (III) oxide, while FeO is iron (II) oxide. I am not exactly sure though.

Physical Change - an example of physical change on Mars is when its polar ice caps on change size in between winter and summer

Jupiter:

Chemical Change - Nitrogen and Hydrogen have combined to create the ammonia crystals (NH 3) (Sorry the right parenthesis wouldn't go up) which made up the clouds in Jupiter's atmosphere.

Physical Change - The rings of Jupiter are constantly being added to by material being ejected from the satellites Adrastea and Metis.

Saturn:

Chemical Change - The lower level clouds on Saturn are made up of the atoms N, H4, S, and H all coming together to make ammonium hydrosulfide.

Physical Change - The rings of Saturn, which are mainly composed of ice are still slowly getting larger and smaller.

Uranus:

Chemical Change - The stratosphere of Uranus contains acetylene, which is two hydrogen atoms and two carbon atoms coming together.

Physical Change - The clouds on Uranus are constantly changing shape and size.