B1 - Key Definitions
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What is the Avogadro constant?
6.02 x 10^23
What does the Avogadro constant mean?
the number of particles in each mole of carbon-12
1 mol of H =
1 mol of hydrogen atoms
1 mol of H2 =
1 mole of hydrogen molecules
What is molar mass?
mass per mole of a substance
What is empirical formula?
simplest whole number ratio of atoms of each element in a compound
What is percentage yield?
percentage yield = actual yield / theoretical yield x 100
What is molar gas volume?
the volume of 1 mole of gas
What is an acid?
compound that releases H+ ions in aqueous solutions
What are alkalis?
-water soluble bases -releases OH- ions into aqueous solutions
What is a base?
substance that can accept H+ ions from another substance
What is neutralisation?
reaction between H+ and OH- forming water
What is a strong acid?
acid that completely dissociated in solution
What is a titration?
technique used to determine the amount of one solution of a known concentration required to completely react with a known volume of another solution of unknown concentration
What is a weak acid?
acid that only partly dissociates in solution