DP Chemistry (first assessment 2025)
Question 21N.1A.SL.TZ0.27
| Date | November 2021 | Marks available | [Maximum mark: 1] | Reference code | 21N.1A.SL.TZ0.27 |
| Level | SL | Paper | 1A | Time zone | TZ0 |
| Command term | State | Question number | 27 | Adapted from | N/A |
27.
[Maximum mark: 1]
21N.1A.SL.TZ0.27
What is correct for pure hot water?
[1]
Markscheme
B
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.5—The ion product constant of water, Kw, shows an inverse relationship between [H+] and [OH–]. Kw = [H+] [OH–]. Recognize solutions as acidic, neutral and basic from the relative values of [H+] and [OH–].
Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.3—The magnitude of the equilibrium constant indicates the extent of a reaction at equilibrium and is temperature dependent. Determine the relationships between K values for reactions that are the reverse of each other at the same temperature.