Question 19
Question 19 of 40
Question image for Q19
Periodic Table
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No letter options?
Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
5. Chemical energetics
5.1. Enthalpy change, \(\Delta H\)

understand that chemical reactions are accompanied by enthalpy changes and these changes can be exothermic (\(\Delta H\) is negative) or endothermic (\(\Delta H\) is positive)

14. Hydrocarbons
14.1. Alkanes

recall the reactions (reagents and conditions) by which alkanes can be produced: (a) addition of hydrogen to an alkene in a hydrogenation reaction, \( H_2(g) \) and Pt/Ni catalyst and heat (b) cracking of a longer chain alkane, heat with \( Al_2O_3 \)

15. Halogen compounds
15.1. Halogenoalkanes

describe the elimination reaction with NaOH in ethanol and heat to produce an alkene as exemplified by bromoethane