Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chem > Key Stuff - Module 3 + 5 > Flashcards

Key Stuff - Module 3 + 5 Flashcards

1
Q

1st ionisation energy

A

removal of 1 mole of electrons from 1 mol of gaseous atoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Periodicity

A

Repeating trends in physical + chemical properties

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Metallic bonding

A

Strong electrostatic attraction bt/w positive ions + delocalised electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Disproportionation

A

Oxidation + reduction of the same element

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Activation Energy

A

Minumum energy required for a reaction to take place

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Enthalpy change of formation

A

Formation of 1 mol of compound froms its elements

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Enthalpy change of combustion

A

Compete combustion of 1 mol of a substance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Enthalpy change of neutralisation

A

Formation of 1 mol of water from neutralisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Average bond enthalpy

A

Breaking of 1 mol of bonds in gaseous molecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Homogenous catalyst

A

Same phase a reactants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Heterogeneous catalyst

A

Different phase as reactants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Bronsted-Lowry acid

A

Donates a proton

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Bronsted-Lowry Base

A

Accepts a proton

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What indicator should you use for strong acid + strong base reaction

A

Phenolphalein or methyl orange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Strong acid + weak base

A

Methyl orange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Weak acid + strong base

A

Phenolphthalein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Weak acid + weak base

A

pH at equivalence - depends on the relative strength of acid + base

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Lattice enthalpy

A

Formation of 1 mol of ionic lattice from gaseous ions

19
Q

Enthalpy change of solution

A

Dissolving of 1 mol of solute

20
Q

Enthalpy change of hydration

A

Dissolving of 1 mol of gaseous ions in water

21
Q

Entropy

A

Measure of dispersal of energy in a system which is greater, the more disorder a system

22
Q

Standard electrode potential

A

Is a measure of the reducing power of any element or compound

23
Q

Units for rate constant (k)

24
Q

Rate graphs for 0 order reaction

25
Q

Rate graphs for 1st order

26
Q

Rate graphs for 2nd order

27
Q

Rate determining step info

A
  • Slowest step is rate determining step
  • Species involved in this step are found in overall rate equation
28
Q

Weak acids

A

Partially dissociate into ions in aqueous solutions

29
Q

Strong acids

A

Completely dissociate into ions in aqueous solutions releasing H+ ions

30
Q

Name 3 basic strong acids

A
  • HCl
  • HNO3
  • H2SO4
31
Q

Name a basic weak acids

A

Carboxylic acids eg ethanoic acid

32
Q

Name 3 basic strong bases

A
  • NaOH
  • KOH
  • Ba(OH)2
33
Q

Name a weak base

A

Ammonia (NH3)

34
Q

State the redox reaction bt/w manganate (VII) + iron (II)

35
Q

Describe the method you would use to do a redox titration calculation

A
  1. Form redox equation
  2. FInd the moles of compound
  3. Use redox equation to find the moles of unknown
  4. Scale up if needed
36
Q

What must you remember when calculating elctrode potential

A

Reduced electrode potential is always more positive electrode potential

37
Q

Explain the process of a proton exchange fuel cell

A
  1. Hydrogen gas enters system
  2. Hydrogen oxidised to H+ at anode
  3. Electrons travel via external circuit
  4. H+ ions travel through electrolyte + membrane
  5. oxygen gas enters cell
  6. Oxygen is reduced at cathode
  7. Catalyst speeds up reaction bt/w oxygen + H+
  8. Water produced
38
Q

Advantages of fuel cells

A
  • Eliminate pollution caused by burning fossil fuels
  • Eliminates green house gases if hydrogen used comes from electrolysis of water
  • Higher efficiency than diesel or gas engines
39
Q

Alkaline Fuel Cells (AFC)

A
  • Uses alkaline electrolyte eg KOH
  • Used by NASA in space shuttles
40
Q

Direct Methanol Fuel Cells (DMFC)

A
  • Uses polymer membrane as electrolyte
  • Catalyst on anode draes hydrogen from liquid methanol
  • Eliminates need for fuel reformer, pure methanol can be used as fuel
41
Q

Rearranged Arrhenius equation for Ea

A

Ea = RT (lnA-lnk)

42
Q

Rearranged Arrhenius equation for A

43
Q

Rearranged Arrhenius equation for T

A

T = Ea / R (lnA-lnk)

Chem (46 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions