AS & A Level Chemistry (9701) — May–June 2025, Paper 23
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →(i) Give the full electronic configuration of a fluorine atom. (ii) Deduce the number of pairs of electrons in the second energy shell, n = 2, of an oxygen atom. (iii) Draw the…
Answer this question and get it marked →A Period 3 oxide produces a solution with a pH greater than 10 when it is added to water. State the formula of the oxide.
Answer this question and get it marked →Different hydrocarbon mixtures produced from fractional distillation of crude oil have different uses. (i) State the compound that is heated with long-chain hydrocarbons to…
Answer this question and get it marked →(i) Use Fig. 4.1 to find the average rate of change of concentration of HCl(aq) in this reaction between 0–100 seconds and between 400–500 seconds. Include units in your answers.…
Answer this question and get it marked →(i) Deduce the empirical formula of W (CH2=C(CH3)COOH, molecular formula C4H6O2). (ii) Two different reagents are each added to separate samples of W as shown in Table 5.1.…
Answer this question and get it marked →HOCl reacts with CH2=CH2 to produce HOCH2CH2Cl in an electrophilic addition reaction. (i) Define addition reaction. (ii) Describe how Cl2 is used to produce HOCl. (iii) State one…
Answer this question and get it marked →