3.1.2 amount of substance Flashcards
(20 cards)
What happens when a substance and oxygen react?
oxides form
What happens when a metal reacts with water?
metal hydroxide and hydrogen form
What happens when a metal and acid react together?
A salt and hydrogen forms
What happens when a oxide and acid react together?
A salt and water forms
What happens when a hydroxide and acid react together
salt and water forms
What happens when a carbonate and acid react together?
A salt, water and carbon dioxide forms.
What happens when a hydrogen carbonate and acid react together?
A salt, water and carbon dioxide forms
What happens when ammonia and an acid react?
Ammonium salt forms
what happens when a metal carbonate decomposes?
metal oxide and carbon dioxide forms
Define relative atomic mass.
Average mass of one atom of an element/ 1/12th the mass of a carbon 12 atom
Define relative molecular mass.
Average mass of one molecule/ 1/12th the mass of a C 12 atom
Formula for % mass of an element in a compound.
( Ar of element x no. of its atoms/ Mr of compound ) x 100
What is avogadros constant?
6.022 x 10’23
Define empirical formula
The simplest ratio of the atoms of each element in a compound.
Give the equation linking moles, concentration and volume.
n = c x v
what is the molar gas constant
8.31
Equation for ideal gas
PV=nRT
Give equation for % atom economy
( mass of desired product/ total mass of reactants) x100
Give equation for % yield
( amount of specific product formed / maximum amount of product possible) x 100
Why could the amount produced be less than the maximum theoretical mass?
reversible reaction, side reaction, product lost in purification, incomplete reaction
