scince test 2 8th

difference between Ion and atom

an atom has an equal number of protons and electrons an ion doesn't

chemical change

irresversable the original matter can not be recovered. new substance is created

physical change

easily reverisble, can go back to original form, doesn't change the matter. only apperance or form of matter change

cohesion

water is attracted to water

adhesion

water is attracted to other substances

surface tension

allows things to float on water without being submeged because the water wants to take as little surface area as possible.

universal solevent

can disolve many types of molecules because of the polar bonds and ability to form hydrogen bonds

atomic number

number of protons

atomic mass

protons + neutrons

atomic charge

protons-electrons

how is the periodic table arranged

left to right number of protons
colmuns by number of eletrons

element vs molecule

elements are only made up of one kind of atoms
molecules can be made up by one or more types of atoms

isotopes

dependant on the number of neutrons

formula for density

density = mass/volume

Compound

two or more atoms that are different that are connected

chemical bonds

holds two atoms in a molecule or compound together