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Date	May 2018	Marks available	1	Reference code	18M.2.hl.TZ2.1
Level	HL	Paper	2	Time zone	TZ2
Command term	Outline	Question number	1	Adapted from	N/A

Question

A student determined the percentage of the active ingredient magnesium hydroxide, Mg(OH)₂, in a 1.24 g antacid tablet.

The antacid tablet was added to 50.00 cm³ of 0.100 mol dm⁻³ sulfuric acid, which was in excess.

Outline why repeating quantitative measurements is important.

Markscheme

to reduce random errors

to increase precision

Accept “to ensure reliability”.

[1 mark]

Examiners report

[N/A]

Syllabus sections

Core » Topic 1: Stoichiometric relationships » 1.1 Introduction to the particulate nature of matter and chemical change

Show 65 related questions

18M.1.sl.TZ1.1: Which is a homogeneous mixture? A. Oil and water B. Sand and water C. Ethanol...
22M.2.sl.TZ1.1a(i):
Write a balanced equation for the reaction that occurs.
22M.2.sl.TZ1.1d(i):
Calculate coefficients that balance the equation for the following reaction.

__ Mg₃N₂(s) + __ H₂O (l) → __ Mg(OH)₂(s) + __ NH₃(aq)
17N.1.sl.TZ0.4:
What is the sum of the coefficients when the following equation is balanced using the smallest whole numbers?

__C₆H₁₂O₆ (aq) → __C₂H₅OH (aq) + __CO₂ (g)

A. 4

B. 5

C. 9

D. 10
22M.2.hl.TZ1.1d(i):
Calculate coefficients that balance the equation for the following reaction.
16N.2.sl.TZ0.4c:
Magnesium burns in air to form a white compound, magnesium oxide. Formulate an equation for the reaction of magnesium oxide with water.
19N.2.sl.TZ0.3c(i):
Write an equation for the complete combustion of the organic product in (b).
18M.3.sl.TZ1.2a:
Annotate the balanced equation below with state symbols.

CaCO₃(__) + 2HCl(__) → CaCl₂(__) + CO₂(__) + H₂O(__)
19N.1.sl.TZ0.3: Which is correct? A. Mixtures are either homogeneous or heterogeneous and their chemical...
18M.1.sl.TZ2.1:
What is the sum of the coefficients when the equation is balanced with the lowest whole number ratio?

__Na₂S₂O₃(aq) + __HCl(aq) → __S(s) + __SO₂(g) + __NaCl(aq) + __H₂O(l)

A. 6

B. 7

C. 8

D. 9
18M.2.sl.TZ2.1b:
Formulate the equation for the reaction of H₂SO₄ with Mg(OH)₂.
18M.2.sl.TZ1.1f:
The combustion of urea produces water, carbon dioxide and nitrogen.

Formulate a balanced equation for the reaction.
18N.2.sl.TZ0.5a: State why this equilibrium reaction is considered homogeneous.
18N.2.hl.TZ0.5a: State why this equilibrium reaction is considered homogeneous.
19N.2.sl.TZ0.3b:
Write an equation for the reaction of C₂H₅Cl with aqueous sodium hydroxide to produce a C₂H₆O compound, showing structural formulas.
21N.2.sl.TZ0.5a:
Formulate an equation for the reaction of one mole of phosphoric acid with one mole of sodium hydroxide.
19M.2.sl.TZ1.3d:
The reaction of sodium peroxide with excess water produces hydrogen peroxide and one other sodium compound. Suggest the formula of this compound.
19M.2.hl.TZ1.3j:
The reaction of sodium peroxide with excess water produces hydrogen peroxide and one other sodium compound. Suggest the formula of this compound.
19M.1.hl.TZ1.1: Which diagram represents a heterogeneous mixture?
19M.1.sl.TZ1.1: Which diagram represents a heterogeneous mixture?
19M.1.sl.TZ2.2:
What is the sum of the integer coefficients when propene undergoes complete combustion?

__C₃H₆ (g) + __O₂ (g) → __CO₂ (g) + __H₂O (l)

A. 11

B. 17

C. 21

D. 23
22M.2.sl.TZ2.1a:
Determine the coefficients that balance the equation for the reaction of lithium with water.
19M.1.hl.TZ2.2:
What is the sum of the integer coefficients when propene undergoes complete combustion?

__C₃H₆ (g) + __O₂ (g) → __CO₂ (g) + __H₂O (l)

A. 11

B. 17

C. 21

D. 23
20N.2.hl.TZ0.5a:
Write a balanced equation for the reaction.
16N.2.sl.TZ0.3a:
Identify the formula and state symbol of X.
19N.2.sl.TZ0.5c(ii):
Write the half-equation for the formation of gas bubbles at electrode 1.
19N.2.sl.TZ0.6a(i):
Deduce the equation for the decomposition of guanidinium nitrate.
19N.2.sl.TZ0.2a(i): Determine the mole ratio of S2O32− to O2, using the balanced equations.
19N.2.hl.TZ0.3c(i):
Write an equation for the complete combustion of the compound C₃H₈O formed in (a)(iv).
19N.2.hl.TZ0.6c(ii):
Write the half-equation for the formation of gas bubbles at electrode 1.
19N.2.hl.TZ0.6c(iv):
Deduce the half-equation for the formation of the gas identified in (c)(iii).
17M.2.sl.TZ1.2f.i:
Formulate an equation for this reaction.
19M.1.sl.TZ1.2:
What is the sum of the coefficients when the equation is balanced with the smallest whole numbers?

__BaCl₂ (aq) + __Fe₂(SO₄)₃ (aq) → __FeCl₃ (aq) + __BaSO₄ (s)

A. 4

B. 6

C. 8

D. 9
21M.2.sl.TZ1.4c(i):
Determine the overall equation for the production of methanol.
21N.2.hl.TZ0.5a:
Formulate an equation for the reaction of one mole of phosphoric acid with one mole of sodium hydroxide.
19N.2.sl.TZ0.6b:
Another airbag reactant produces nitrogen gas and sodium.

Suggest, including an equation, why the products of this reactant present a safety hazard.
17M.1.sl.TZ2.1:
What is the sum of the coefficients when the equation is balanced with whole numbers?

_—C₈H₁₈(g) + _—O₂(g) → _—CO(g) + _—H₂O(l)

A. 26.5

B. 30

C. 53

D. 61
17M.2.sl.TZ1.3b:
Formulate an equation for the reaction between VO²⁺(aq) and V²⁺(aq) in acidic solution to form V³⁺(aq).
19N.1.sl.TZ0.2:
What is the sum of the coefficients when the equation is balanced with whole numbers?

__MnO₂ (s) + __HCl (aq) → __MnCl₂ (aq) + __H₂O (l) + __Cl₂ (g)

A. 6

B. 7

C. 8

D. 9
16N.2.hl.TZ0.4i:
Magnesium chloride can be electrolysed.

(i) Deduce the half-equations for the reactions at each electrode when molten magnesium chloride is electrolysed, showing the state symbols of the products. The melting points of magnesium and magnesium chloride are 922K and 987K respectively.

(ii) Identify the type of reaction occurring at the cathode (negative electrode).

(iii) State the products when a very dilute aqueous solution of magnesium chloride is electrolysed.
21N.1.sl.TZ0.2: Which statement describes all homogeneous mixtures? A. Any sample has the same ratio of the...
22M.2.hl.TZ1.1a(i):
Write a balanced equation for the reaction that occurs.
19M.2.hl.TZ1.2f(ii):
Formulate the equation for the complete combustion of benzoic acid in oxygen using only integer coefficients.
16N.2.sl.TZ0.4g:
Magnesium chloride can be electrolysed.

Deduce the half-equations for the reactions at each electrode when molten magnesium chloride is electrolysed, showing the state symbols of the products. The melting points of magnesium and magnesium chloride are 922 K and 987 K respectively.

Anode (positive electrode):

Cathode (negative electrode):
18M.2.hl.TZ1.1f:
The combustion of urea produces water, carbon dioxide and nitrogen.

Formulate a balanced equation for the reaction.
21M.2.hl.TZ1.1e(i):
Write the equation for this reaction.
21M.2.hl.TZ1.3a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
21N.2.sl.TZ0.3a(ii):
Write an equation for the reaction of white phosphorus (P₄) with chlorine gas to form phosphorus trichloride (PCl₃).
21M.2.hl.TZ1.4c(i):
Determine the overall equation for the production of methanol.
17M.1.sl.TZ1.2:
Which statements about mixtures are correct?

$\begin{array}{*{20}{l}} {{\text{I.}}}&{{\text{The components may be elements or compounds.}}} \\ {{\text{II.}}}&{{\text{All components must be in the same phase.}}} \\ {{\text{III.}}}&{{\text{The components retain their individual properties.}}} \end{array}$

A. I and II only

B. I and III only

C. II and III only

D. I, II and III
21M.2.sl.TZ2.1d(i):
Write the equation for the reaction of Ca(OH)₂ (aq) with hydrochloric acid, HCl (aq).
21M.1.sl.TZ2.4:
What is the sum of the coefficients when the equation is balanced with whole numbers?

__Sn(OH)₄(aq) + __NaOH (aq) → __Na₂SnO₃(aq) + __H₂O (l)

A. 4

B. 5

C. 6

D. 7
19M.2.sl.TZ1.2b(ii):
Formulate the equation for the complete combustion of benzoic acid in oxygen using only integer coefficients.
20N.2.sl.TZ0.1d(iii):
Write the equation for the reaction of chloroethane with a dilute aqueous solution of sodium hydroxide.
21M.2.sl.TZ1.1d(i):
Write the equation for this reaction.
21M.2.sl.TZ1.3a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
19M.3.hl.TZ1.1a:
Deduce, giving a reason, the group of elements in the periodic table most likely to undergo sublimation.
20N.3.sl.TZ0.2f:
Comment on the magnitudes of random and systematic errors in this experiment using the answers in (e).
17M.2.hl.TZ1.3c.i:
Formulate an equation for the reaction between VO²⁺(aq) and V²⁺(aq) in acidic solution to form V³⁺(aq).
21M.2.hl.TZ2.1c(i):
Write the equation for the reaction of Ca(OH)₂(aq) with hydrochloric acid, HCl (aq).
21M.2.hl.TZ2.5a(i):
Write the chemical equation for the complete combustion of ethanol.
19M.3.sl.TZ1.1a:
Deduce, giving a reason, the group of elements in the periodic table most likely to undergo sublimation.
21M.1.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
22M.1.sl.TZ2.4:
Which equation represents the deposition of iodine?

A. I₂(g) → I₂(l)

B. I₂(g) → I₂(s)

C. I₂(l) → I₂(g)

D. I₂(s) → I₂(g)
21N.2.hl.TZ0.3a(ii):
Write an equation for the reaction of white phosphorus (P₄) with chlorine gas to form phosphorus trichloride (PCl₃).

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