c2 Flashcards
what is relative atomic mass
compares atoms to carbon C 12 it has almost the same value as mass number
what is relative formula mass
the sum of the relative atomic mass of the atoms shown in the formula
how do you work out the percentage of a element in a compound?
mass of the element total mass (RFM) X 100
What is the empirical formula
it gives up the simplest radio of element of a compound
what is a revesable reaction
in a verersable reaction in a closed system will reach a point of equillibruim
rate of forward reaction = rate of backward reaction
how do you work out the rate of a reaction
amount of reactant used
time
how do chemical reactions occur
when reacting particles collide with each other successfully
if the temperature is increased what would that do to the rate of a reaction?
it would speed up the rate of reaction as the particles collide more as they have more energy.
if the pressure is increased what would that do to the rate of a reaction?
increases the frequency of successful collisions
if the concentration is increased what would that do to the rate of a reaction?
increases chances of successful collisions
if the surface area is increased what would that do to the rate of a reaction?
increase collisions
what is an exothermic reaction
heat given out
energy transferred into surroundings
what is a endothermic reaction
heat taken in
energy from surroundings
what is a salt?
a chemical made when hydrogen and acid is pushed out by a metal
