DP Chemistry (last assessment 2024)

Test builder »

Question 19M.3.hl.TZ1.a(ii)

Select a Test
Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.hl.TZ1.a(ii)
Level hl Paper 3 Time zone TZ1
Command term Formulate Question number a(ii) Adapted from N/A
a(ii).
[Maximum mark: 2]
19M.3.hl.TZ1.a(ii)

Technetium-99m, a widely used radionuclide, has a half-life of 6.0 hours and undergoes gamma decay to technetium-99.

Technetium-99 decays further, emitting beta radiation. Formulate the equation for the decay of technetium-99.

[2]

Markscheme

99Tc → 99Ru + β–


Ru  [✔]

mass number of Ru AND beta product  [✔]

 

Note: Accept “e/e–/ 0 − 1 e” for “β–”.

Examiners report

A common incorrect answer was to give Tc as a product or to give an incorrect symbol for beta radiation. Most candidates scored a mark for the correct mass number of the product and beta radiation.

Syllabus sections