chemistry
what is a physical property?
colour, length, volume, opacity
what is an example of a physical property?
the element sultur is yellow is coloir
what is a chemical change?
acidity, reactivity, flammability, toxicity
what shows evidence of chemical change?
a marshmallow is burned and turns black
non metals are...
brittle, poor conductors, mostly gases,
an electron is..
negativly chwrged particle outside the nucleus
in a lewis dot diagtam you must draw...
element symbol and all valence electrons
particle in a solid and gas are different because...
gas particle are spread farther apart
the rows of a periodic table are called?
periods
the groups of a leriodic table are called?
families
describe metals
solid, shiny, strong conductors
the electron shell closest to the nucleus of the atom holds how many electrons?
2
what is group one of the periodic table called?
alkali metals
what us group two of the periodic table called?
alkaline earth metals
most metals on the periodic table are...
metals
what are valence electrons?
electrons on the outer shell of an atom
what is true about density?
density is the ratio of mass to volume in a substance
what is the difference between mechanical mixture and solution?
you can see the defferent parts of a mechanical mixture. solution you cant
what is the density equation?
D=mass divided by volume
what are two properties of alkali metals
very reactive, want to lose the 1 valence electron
descibe how to draw a bohr-rutherford diagram
atomic symbol with the protons and neutrons in the middle surrounded by the valence shells according to the amount of electrons
list and descibe the two types of pure substances
element-1 atom compound-2+chemicals combined(chemical bonds)
what is the equation to calculate mass
density x volume
what is the equation to calculate volume
mass divided by density
what is ionic and covalents compounds?
ionic- metal and non metal bonds covalent- both non metals bonds
what are cations
positve metals, lose electrons
what are anions
non metals, negative, gain electrons