DP Chemistry (first assessment 2025)

Test builder »

Question 21M.1A.SL.TZ1.4

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ1.4
Level	SL	Paper	1A	Time zone	TZ1
Command term	Solve	Question number	4	Adapted from	N/A

4.

[Maximum mark: 1]

21M.1A.SL.TZ1.4

What is the coefficient of $HCl$ (aq) when the equation is balanced using the smallest possible whole numbers?

$__CuO (s)+ __HCl {(aq) → __CuCl}_{2} {(aq) + __H}_{2} O (l)$

A. 1

B. 2

C. 3

D. 4

[1]

Markscheme

B

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.1—How much? The amount of chemical change » Reactivity 2.1.2—The mole ratio of an equation can be used to determine: • the masses and/or volumes of reactants and products • the concentrations of reactants and products for reactions occurring in solution. Calculate reacting masses and/or volumes and concentrations of reactants and products.