0653.C5.1.01 — State that an exothermic reaction transfers thermal energy to the surroundings leading to an increase in the temperature of the surroundings: past paper questions
Real questions on 0653.c5.1.01 — state that an exothermic reaction transfers thermal energy to the surroundings leading to an increase in the temperature of the surroundings
The newest 20 of 34 written questions. Open one to see it on the real paper.
- 0653/31 · October/November 2025 · Q6a(iii)[2]
This reaction is exothermic. Describe what is meant by exothermic.
See it on the paper → - 0653/32 · October/November 2025 · Q6b(iii)[1]
The temperature of the water increases during the reaction. Name the type of reaction that causes an increase in the temperature of the surroundings.
See it on the paper → - 0653/33 · October/November 2025 · Q6b(iii)[1]
The temperature of the water increases during the reaction. Name the type of reaction that causes an increase in the temperature of the surroundings.
See it on the paper → - 0653/42 · October/November 2025 · Q4b(i)[1]
Give one conclusion about the energy involved in bond breaking and bond making in this reaction.
See it on the paper → - 0653/31 · May/June 2025 · Q5b(i)[1]
Complete the sentence about an exothermic reaction. (i)
See it on the paper → - 0653/31 · May/June 2025 · Q5b(ii)[1]
State one observation that shows this reaction is exothermic.
See it on the paper → - 0653/31 · May/June 2025 · Q5b(iii)[1]
Complete the word equation for this reaction. potassium + + water
See it on the paper → - 0653/33 · May/June 2025 · Q6b[1]
State the name given to a chemical reaction that releases thermal energy.
See it on the paper → - 0653/32 · February/March 2025 · Q5b[2]
Name the two products of the complete combustion of methane.
See it on the paper → - 0653/32 · October/November 2024 · Q2a(iii)[1]
The conical flask becomes hot during the reaction. State the term for chemical reactions that release heat.
See it on the paper → - 0653/62 · October/November 2024 · Q2a(iii)[1]
Calculate the temperature increase for 1.0 g and for 2.5 g of H. Record your answers in Table 2.1.
See it on the paper → - 0653/62 · October/November 2024 · Q2a(iv)[3]
On the grid, plot a graph of temperature increase (vertical axis) against mass of H. Start the axes at the origin (0, 0).
See it on the paper → - 0653/62 · October/November 2024 · Q2a(v)[1]
One of the values for the temperature increase is anomalous. Circle on the grid the anomalous value.
See it on the paper → - 0653/62 · October/November 2024 · Q2a(vi)[1]
Draw the straight line of best fit.
See it on the paper → - 0653/62 · October/November 2024 · Q2a(vii)[1]
Describe the relationship between the mass of H and the temperature increase.
See it on the paper → - 0653/62 · October/November 2024 · Q2b[3]
During the procedure in (a), the white solid H dissolves to form a blue solution. The student tests the blue solution to identify H. The tests and observations are shown in Table 2.2. test observation add dilute nitric acid followed by aqueous barium nitrate white precipitate flame test green-blue flame Table 2.2 Ident...
See it on the paper → - 0653/62 · October/November 2024 · Q3a[1]
Suggest why the student does this investigation in a dark room.
See it on the paper → - 0653/62 · October/November 2024 · Q3b[1]
The ray box in Fig. 3.1 is connected to a power supply. Fig. 3.2 shows the reading on the voltmeter. 10 5 15 0 V Fig. 3.2 Record the e.m.f. of the power supply. e.m.f. = V The student uses a voltmeter to measure the electromotive force (e.m.f.) of the power supply.
See it on the paper → - 0653/62 · October/November 2024 · Q3c[1]
Fig. 3.3 is drawn to scale and shows the refracted ray for the incident ray at angle of incidence i = 20°. 20° A incident ray P O i Q r refracted ray B Fig. 3.3 (drawn to scale) Measure angle r in Fig. 3.3. Record in Table 3.1 angle r to the nearest degree. angle of refraction r / ° 10 15 20 30 49 40 75 50 total intern...
See it on the paper → - 0653/62 · October/November 2024 · Q3d[2]
For the incident ray at angle of incidence i = 50°, the student observes an effect called total internal reflection. The incident ray is not refracted at O but instead is reflected, as shown in Fig. 3.4. A 50° incident ray reflected ray i P θ O Q B Fig. 3.4 (not to scale) The student tries to measure the angle of refle...
See it on the paper →
What examiners said
Generally answered well. Most candidates knew that an exothermic reaction gives out thermal energy.
— Examiner report, May/June 2025, 0653/31 Q5(b)(i) (Cambridge)
Candidates had to describe an observation of an exothermic reaction. An observation can be made by the sense organs or by instruments. The fact that the potassium catches fire is a good indicator of an exothermic reaction. In this case, answers that stated the water felt warm or increased in temperature (checked with a thermometer) were also credited. Just to say ‘heat energy is given out’ without...
— Examiner report, May/June 2025, 0653/31 Q5(b)(ii) (Cambridge)
A small number of candidates answered this question correctly. The two boxes on the left, potassium and water, are the reactants and between them they have the elements potassium, K, and hydrogen and oxygen in water, H2O. The two boxes on the right of the arrow are the products of the reaction and they can only contain the same elements as the reactants. Therefore, carbon dioxide, given by many ca...
— Examiner report, May/June 2025, 0653/31 Q5(b)(iii) (Cambridge)
Past papers, syllabus and examiner reports © UCLES (Cambridge University Press & Assessment). Questions are matched to topics from the official syllabus. AssessPro is independent and not endorsed by Cambridge.