F321 jan 13 questions Flashcards
(5 cards)
1
Q
Give an example of a simple covalent molecule which has all bond angles equal to 90°. (1)
A
SF6
2
Q
The first ionisation energy of oxygen is less than the first ionisation energy of fluorine.
Explain why. (3)
A
- O has smaller nuclear charge
- Atomic radius of O is larger
- electrons experience the same shielding
- Less nuclear attraction (on outermost electrons) in O
3
Q
In an experiment, a student makes a solution of strontium chloride, SrCl2, by adding excess dilute hydrochloric acid to strontium carbonate.
Describe what the student would observe (1)
A
- Effervescence
AND - Strontium carbonate dissolves
4
Q
In another experiment, a student attempts to make a solution of strontium chloride by adding chlorine water to aqueous strontium bromide.
Describe what the student would observe.(1)
A
mixture would turn orange
5
Q
Chlorine is more reactive than bromine. Explain why. (4)
A
- Chlorine will gain an electron more easily than bromine
- (An atom of) chlorine is smaller (than bromine)
- (Outermost shell of) chlorine is less shielded (than bromine)
- Nuclear attraction (on the electron to be gained) by chlorine is greater (than bromine)
