stoichiometry

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Total cards: 21•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (21)

Front (Question)

what is a empirical formula of a compound

Back (Answer)

the simplest whole number ratio of the different atoms or ions in a compound

Front (Question)

ionic compound formula

Back (Answer)

cross over method

Front (Question)

why are atoms electricly neutral

Back (Answer)

because the number of protons and electrons are the same.

Front (Question)

what is the valecy of a atom

Back (Answer)

the number of electrons gained, lost or shared- this determains the ability of the atom to combine with other elements- determains the number of outer shells.

Front (Question)

what are spectator ions

Back (Answer)

ions which dont change during a equation

Front (Question)

what is relative atomic mass

Back (Answer)

as the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of 12C

Front (Question)

what is relative molecular mass

Back (Answer)

Mr, as the sum of the relative atomic masses. Relative formula mass, Mr, will be used for ionic compounds

Front (Question)

what is a mole (n)

Back (Answer)

the unit of amount of substance, one mole contains 6.02 × 1023 particles, e.g. atoms, ions, molecules; this number is the Avogadro constant.

Front (Question)

what is the formula of moles

Back (Answer)

n=m/mr

#10

Front (Question)

percentage yield

Back (Answer)

amount of usable product actual yield/ theoretical yield x 100

#11

Front (Question)

what is a molecular formula

Back (Answer)

the number and type of different atoms in one molecule

#12

Front (Question)

translation of dm - cm etc

Back (Answer)

dm- cm = *1000 cm-dm = /1000

#13

Front (Question)

formula for number of moles in terms of gas

Back (Answer)

volume of gas/ 24

#14

Front (Question)

percentage purity formula

Back (Answer)

(mass of pure product/mass of impure product)×100

#15

Front (Question)

number of moles in terms of concentration

Back (Answer)

concentration (mol/dm3) * volume (dm3)

#16

Front (Question)

what are the possible units for concentration

Back (Answer)

g/dm3 or mol/dm3

#17

Front (Question)

whats the formula for concentration in g/dm3

Back (Answer)

mass (g) / volume (dm3)

#18

Front (Question)

how do you convert mol/dm3 to g/dm3

Back (Answer)

you multiply the concentration in mol/dm3 by the MR

#19

Front (Question)

what are the golden five + formulae

Back (Answer)

sulphate- SO4 2- carbonate- CO3 2- nitrate- NO3 - ammonium- NH4 + hydroxide- OH -

#20

Front (Question)

what is meant by relative formula mass and how to calculate it

Back (Answer)

mass of whole compound, add all the mr’s of the elements in the compound

#21

Front (Question)

how to calculate percentage composition

Back (Answer)

(mr * number of atoms/ mr of compound) * 100