| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.sl.TZ1.15 |
| Level | SL | Paper | 1 | Time zone | TZ1 |
| Command term | Deduce | Question number | 15 | Adapted from | N/A |
Question
When some solid barium hydroxide and solid ammonium thiosulfate were reacted together, the temperature of the surroundings was observed to decrease from 15 °C to –4 °C. What can be deduced from this observation?
A. The reaction is exothermic and \(\Delta H\) is negative.
B. The reaction is exothermic and \(\Delta H\) is positive.
C. The reaction is endothermic and \(\Delta H\) is negative.
D. The reaction is endothermic and \(\Delta H\) is positive.
Markscheme
D
Examiners report
[N/A]
Syllabus sections
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