Science Midterm Test Flashcards
How many valence electrons are in the neutral atom Na
one
when naming a compound
the non-metal gets a -ide ending
a polyatomic ion
is made of more than one elemant
In a covalent compound, how do atoms complete their outer electron shells?
sharing electrons
why does log burning seem to disobey the law of conservation of mass
the gasses escaped cant be measuerd
what gas is given off when zinc reacts with hydrochloric acid
hydrogen gas
neutralization reactions occur between
an acid and a base
which type of bond creates molecules
covalent
a double displacement occurs when
two-electron are swapped between ions
prefixes are only used for compounds containing
a non-metal and a metal
when forming ionic compound the overall charge
must be 0
what are two categories that all matter can be divided by into based on compitistion
mixtures and pure substances
whats a example pure substance
air
what is a relative nuber of subatomic particles is always true
the number of neutrons is equal to the atomic mass of an atom
in reactiions with non-metals and metals, metals tend to
lose electrons to become positivly charged
what is a prefix
non-metal and non-metal
light
enters your eyes from all objects you see
light year
distance light travels in one year
electromagnetic spectrom
the range of frequency, of electrons radiation
additive colour theory of light
white light is composed of different colours of light. it can only be produced by red, green, blue
subtractive colour theory of light
magenta,yellow,cyan
phosphorescence
absorb light energy and realise visual light of lower
chemiluminescence
almost no heat is [produced as a resukt of this type of reaction
bioluminescence
when chemiluminescence occor in living organisms
