Flashcards in Section 1 Deck (23):
rule at the cathode
hydrogen will be produced if the metal ions are more reactive than the hydrogen ions
rule at the anode
if halide ions are present, halides will be formed
OH- ions at the anode
4OH- --> O2 + 2H2O + 4e-
how to increase the amount of substance produced in electrolysis
-electrolyse for a longer time
-increase the current
how many coulombs is one faraday?
what is one faraday?
one mole of electrons
how to show diffusion
potassium manganate and water
what end does the ammonium chloride ring form closest to?
hydrochloric acid end
relative mass of electron
what is the mass number?
number of protons and neutrons
what is the atomic number?
number of protons
groups of atoms
elements consist of...
one type of atom only
a substance that is made of two or more different elements which are chemically bonded together
what is the difference between a compound and a mixture?
there is no chemical bond between the different parts in a mixture
what is filtration used for?
separating an insoluble solid from a liquid
what is crystallization used for?
to separate a soluble solid from a solution
what can be separated by filtration and crystallisation?
different atomic forms of the same element, which have the same number of protons but different numbers of neutrons
what is Avogadro's number?
moles of gas * 24
no. of moles/volume