C6 - Chemical calculations with mass (PAPER 1) Flashcards
(PAPER 1)
What are the principles of conservation of mass
mass cannot be created or destroyed
why does mass increase when a metal forms a metal oxide
atoms from gaseous oxygen get added
why does mass decrease when an acid reacts with a metal
a gas is produced and it escapes
what is relative formula mass
the sum of relative atomic masses of each atom in a substance
what are the four state symbols
- what do they stand for
(l), (s), (g), (aq)
liquid, solid, gas, aqueous
how can you tell when a symbol equation is balanced
numbers of atoms of each element is the same on both sides
what is a mole
mass of a substance that contains 6.02 x 10^23 particles
what is the value of Avogadro’s constant
6.02 x 10^23
which formula is used to calculate the number of moles from mass and Mr
moles = mass / Mr
which formula is used to calculate the mass of a substance from the number of moles and Mr
mass = moles x Mr
what is a limiting reactant
the reactant that is completely used up in a chemical reaction
what are the units for concentration
g / dm^3 or mol / dm^3
what formula is used to calculate concentration from mass and volume
concentration (g/dm^3) = mass (g) / volume (dm^3)
which formula is used to calculate volume from concentration and mass
volume (dm^3) = mass (g) / concentration (g/dm^3)
how can you convert a volume reading in cm^3 into dm^3
divide by 1000 (10^3)
