Paper Based Questions Flashcards

1
Q

Write an equation ions formed when calcium oxide reacts with water

A

CaO+H2O
—–>Ca(2+) +2OH(-)

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

How to determine whether a silver halide is iodide or bromide?

A
  • Add concentrated aqeuous ammonia
  • Silver bromide is soluble
  • Silver iodine is insoluble
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Three Marks

Explain, in terms of electrons, why chlorine is more reactive than bromine

A
  1. Attraction between outer electrons and positive nucleus decreases
  2. Chlorine atoms are smaller than bromine atoms
  3. Chlorine gains an electron more readily than bromine
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Six Marks

Describe + Explain imbs present in methanol,methanal and methane and deduce their relative boiling points

A
  1. Methanol~hydorgen bonding polar O-H bond
  2. Methanal~PD-PD polar C=O bond
  3. Methane~ID-ID movement of electrons within one molecule induces a dipole in adjacent molecule
  4. Strength of imbs HB>pd-pd>id-id
  5. Boiling points methanol>methanal>methane
  6. All compounds have id-id
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Two marks

Suggest and explain why magnesium can replace calcium in carbonate shell

A
  • Mg and Ca both in group two-both can react with carbonate
  • So same number of outer shell electrons
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Three Marks

Describe + Explain the conditions necessary for nuclear fusion to occur

A
  • High temperature
  • High pressure
  • Provides large enough kinetic energy to overcome the repulsion by the positive charge of the nuclei
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Three marks

Give one advantage and two disadvantages of using coal as an energy source compared to ‘cleaner’ fossil fuels

A
  • Advantage~large supply
  • Disadvantage~can cause respiratory problems and smog
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Two marks

Explain why CH3Cl has a permananent dipole

A
  • The molecule is asymetrical
  • So the charges the charges don’t cancel each other out
How well did you know this?
1
Not at all
2
3
4
5
Perfectly