C6 Chemical calculations with mass Flashcards
What is conservation of mass?
atoms are not created or destroyed; just rearranged
When a metal forms a metal oxide, why does the mass increase?
atoms from gaseous oxygen have been added
When an acid reacts with a metal, why does the mass decrease?
a gas is produced and escapes
What is relative formula mass?
sum of the relative atomic masses of each atom in a substance
What is a mole?
mass of a substance that contains 6.02 x 10^23 particles
Avogadro’s constant
6.02 x 10^23
What formula is used to calculate the number of moles?
(mass, MR, moles)
moles= mass/mr
What is a limiting reactant?
the reactant that is completely used up in a chemical reaction
What is the unit for concentration?
g/dm^3 or mol/dm^3
What formula is used to calculate concentration?
(mass, volume, concentration)
conc = mass/ volume
How can you convert a volume reading from cm^3 to dm^3?
divide by 1000
If the amount of solute in a solution increases, what happens to concentration?
increases