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Flashcards in CH5 Deck (82)
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1

What is a redox reaction?

A reaction in which something is oxidised and something else is reduced.

2

Define oxidation

Loss of electrons OR oxidation state becoming more positive

3

Define reduction.

Gain of electrons OR oxidation state becoming more negative.

4

Define standard electrode potential (Eᶿ)

The potential difference when any half-cell is connected to the standard hydrogen electrode under standard conditions

5

Define amphoteric

A substance that can react with both acids and bases.

6

Define inert pair

ns² Pair of electrons not involved in bonding

7

Define co-ordinate bond

Shared pair of electrons, both from the same atom.

8

Define dimer

A species created when two molecules join together.

9

Define electron deficient

A species with fewer than eight electrons in its outer shell, so this shell is not full.

10

Define lone pair

Pair of electrons in an outer shell that are not involved in bonding

11

Define isoelectronic

Same number of electrons in the outer shell

12

Define acidic oxide

Oxide that reacts with bases.

13

Define basic oxide

Oxide that reacts with acids

14

Define disproportionation

A reaction where atoms of the same element become oxidised and reduced to form two different products.

15

define transition elements

elements with partially filled d-orbitals in their atoms or ions

16

define ligand

a small molecule with a lone pair that can bond to a transition metal ion.

17

define complex (in terms of ligands)

ligands joined to a transition metal by co-ordinate bonds

18

define monodentate

ligand that has one atom that can bond to a metal ion

19

define bidentate

ligand that has two atoms that can bond to a metal ion

20

in terms of rate = k[A]ᵐ[B]ⁱ , what is the overall reaction order?

m + i

21

define rate determining step

the slowest step in a reaction mechanism

22

define an acid

H⁺ ion donor (a proton donor)

23

define a base

H⁺ ion acceptor (a proton acceptor)

24

what are oxidising agents?

they become reduced as they oxidise something else.

25

what are reducing agents?

they become oxidised as they reduce something else.

26

what does the sum of all the oxidation states equal to?

the charge of the species.

for a species with no charge the sum = zero.

27

when the oxidation states becomes more positive is it oxidation or reduction?

oxidation

28

when the oxidation state becomes less positive or more negative, is it oxidation or reduction?

reduction

29

when writing cell diagrams what does ||, | and a comma mean?

|| means the salt bridge
| means a change in state
, goes between species in the same physical state

30

when writing cell diagrams which metal do you put on the left?

the metal with the most negative Eᶿ goes on the left.