SNC2DY-a Chemistry Quiz 1: Matter and it's Properties

pure substance

A substance made of only one kind of matter and having definite properties.

element

A pure substance made of only one kind of atom

compound

A substance made up of atoms of two or more different elements joined by chemical bonds

physical properties

-malleability, ductility, lustrous/dull, melting point/boiling point, solubility, conduct heat/electricity

chemical properties

-flammability, reactivity with water and acids, toxicity, radioactivity

physical vs chemical change

Physical - does not create a new substance, atoms are not rearranged into different compounds

Chemical - converts one substance into another; atoms are rearranged

periodic table

properties of metal

ductile, malleable, conduct electric current well, crystalline structure, high melting points, solids except hg

properties of non metals

dull, brittle, poor conductors, low melting n boiling points, solids or gases except Br

metalloids

-semi conductors moderate boiling/melting, conduction etc

alkali metals

react w water acids halogens oxygen

alkaline earth metals

react w water acids halogens oxygen harder than grp 1

transition metals

majority react with water acids oxygen halogens , precipitates

halogens

strong unpleasant odor can burn skin

noble gases

stable w ful ve shell colorless but when charged emits color

nuclide symbol

charged ions

gain=negative

lose=positive

BR diagram

-energy levels

-planetary

-greater the distance of the electron the stronger

jumps are called energy transitions

-electron in lowest energy level is called ground state

-excited electron=excited state

iso electronic

same number of electrons (w noble gases usually)

isotopes

Atoms of the same element that have different numbers of neutrons and diff atomic mass

-must have same atomic #