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Flashcards in Section 1 Deck (23):
1

rule at the cathode

hydrogen will be produced if the metal ions are more reactive than the hydrogen ions

2

rule at the anode

if halide ions are present, halides will be formed

3

OH- ions at the anode

4OH- --> O2 + 2H2O + 4e-

4

how to increase the amount of substance produced in electrolysis

-electrolyse for a longer time
-increase the current

5

how many coulombs is one faraday?

96,000

6

what is one faraday?

one mole of electrons

7

how to show diffusion

potassium manganate and water

8

what end does the ammonium chloride ring form closest to?

hydrochloric acid end

9

relative mass of electron

1/2000

10

what is the mass number?

number of protons and neutrons

11

what is the atomic number?

number of protons

12

molecules definition

groups of atoms

13

elements consist of...

one type of atom only

14

compound definition

a substance that is made of two or more different elements which are chemically bonded together

15

what is the difference between a compound and a mixture?

there is no chemical bond between the different parts in a mixture

16

what is filtration used for?

separating an insoluble solid from a liquid

17

what is crystallization used for?

to separate a soluble solid from a solution

18

what can be separated by filtration and crystallisation?

rock salt

19

isotope definition

different atomic forms of the same element, which have the same number of protons but different numbers of neutrons

20

what is Avogadro's number?

6.023*10^23

21

volume equation

moles of gas * 24

22

concentration formula

no. of moles/volume

23

when do ionic compound conduct electricity?

when molten or in solution