1.1 + 1.2 Exam Q

Question 1

Answer 1

Question 2

Answer 2

Question 3

Answer 3

Question 4

Answer 4

Question 5

Answer 5

group 2

Question 6

Answer 6

Question 7

Answer 7

Question 8

Answer 8

Question 9

Answer 9

Question 10

Answer 10

Question 11

Answer 11

Question 12

Answer 12

Question 13

Answer 13

Question 14

Answer 14

The bond energy of H–At will be less than that of H–I because bond strength decreases down the group.
A lower bond energy means the bond can absorb lower-energy photons, which correspond to longer wavelengths.
The absorption maximum for H–At is likely to shift further into the visible spectrum (400−700nm).

Explanation for Color:
If the absorption maximum for H–At falls within the visible range, it will absorb specific wavelengths of visible light.
The unabsorbed wavelengths of visible light will be transmitted or reflected, giving H–At a characteristic color.

Question 15

Answer 15

far left

Question 16

Explain why hydrogen atoms emit only certain definite frequencies of visible light.[2]

Answer 16

electron falls from higher energy levels to lower energy levels /
to n = 2 (1)
the difference between any two energy levels is fixed / energy
levels are quantised (1)

Question 17

define ionisation energy

Answer 17

this is the energy required to remove an electron from an atom of
hydrogen / for an electron to go from n = 1 to n = ∞ (1)
in the gaseous state (1)

Question 18

Answer 18

electron promoted to a higher energy level (1)
falls back down to a lower energy level (1)

Question 19

Answer 19

Question 20

Answer 20