DP Chemistry (first assessment 2025)

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Reactivity 2. How much, how fast and how far? » Reactivity 2.1—How much? The amount of chemical change

Reactivity 2.1—How much? The amount of chemical change

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Directly related questions

22N.1A.SL.TZ0.3:
How many moles of carbon dioxide are produced by the complete combustion of 7.0 g of ethene, C₂H₄ (g)?

M_r = 28

A. 0.25

B. 0.5

C. 0.75

D. 1.0
22N.1A.SL.TZ0.3:
How many moles of carbon dioxide are produced by the complete combustion of 7.0 g of ethene, C₂H₄ (g)?

M_r = 28

A. 0.25

B. 0.5

C. 0.75

D. 1.0
22N.2.SL.TZ0.5a:
Calculate the amount, in mol, of sulfur dioxide produced when 500.0 g of lignite undergoes combustion.

S (s) + O₂ (g) → SO₂ (g)
22N.2.SL.TZ0.5a:
Calculate the amount, in mol, of sulfur dioxide produced when 500.0 g of lignite undergoes combustion.

S (s) + O₂ (g) → SO₂ (g)
22N.2.SL.TZ0.a:
Calculate the amount, in mol, of sulfur dioxide produced when 500.0 g of lignite undergoes combustion.

S (s) + O₂ (g) → SO₂ (g)
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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
19M.1A.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

Sub sections and their related questions

Reactivity 2.1.1—Chemical equations show the ratio of reactants and products in a reaction. Deduce chemical equations when reactants and products are specified.

22M.2.SL.TZ1.1a(i):
Write a balanced equation for the reaction that occurs.
21N.2.SL.TZ0.3a(ii):
Write an equation for the reaction of white phosphorus (P₄) with chlorine gas to form phosphorus trichloride (PCl₃).
21N.2.SL.TZ0.3c(vi): State, with a reason, the effect of an increase in temperature on the position of this equilibrium.
19N.2.SL.TZ0.6a(i):
Deduce the equation for the decomposition of guanidinium nitrate.
19N.1A.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
21M.2.SL.TZ2.1c(i):
Write the equation for the reaction of Ca(OH)₂(aq) with hydrochloric acid, HCl (aq).
21M.2.SL.TZ1.1e(i):
Write the equation for this reaction.
21N.2.SL.TZ0.3a(ii):
Write an equation for the reaction of white phosphorus (P₄) with chlorine gas to form phosphorus trichloride (PCl₃).
21N.2.SL.TZ0.3c(iii): State, with a reason, the effect of an increase in temperature on the position of this equilibrium.
21M.1A.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
21M.2.SL.TZ1.1d(i):
Write the equation for this reaction.
22M.2.SL.TZ2.5b:
Deduce the overall cell reaction including state symbols. Use section 7 of the data booklet.
22N.1A.HL.TZ0.29:
What is the coefficient for H⁺ when the equation below is balanced?

__Pb (s) + __NO₃⁻ (aq) + __H⁺ (aq) → __Pb²⁺ (aq) + __NO (g) + __H₂O (l)

A. 2

B.  4

C.  6

D.  8
22M.2.SL.TZ1.1a(i):
Write a balanced equation for the reaction that occurs.
22M.2.SL.TZ1.a(i):
Write a balanced equation for the reaction that occurs.
21N.2.SL.TZ0.3a(ii):
Write an equation for the reaction of white phosphorus (P₄) with chlorine gas to form phosphorus trichloride (PCl₃).
21N.2.SL.TZ0.3c(vi): State, with a reason, the effect of an increase in temperature on the position of this equilibrium.
21N.2.SL.TZ0.a(ii):
Write an equation for the reaction of white phosphorus (P₄) with chlorine gas to form phosphorus trichloride (PCl₃).
21N.2.SL.TZ0.c(vi): State, with a reason, the effect of an increase in temperature on the position of this equilibrium.
19N.2.SL.TZ0.6a(i):
Deduce the equation for the decomposition of guanidinium nitrate.
19N.2.SL.TZ0.a(i):
Deduce the equation for the decomposition of guanidinium nitrate.
19N.1A.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
21M.2.SL.TZ2.1c(i):
Write the equation for the reaction of Ca(OH)₂(aq) with hydrochloric acid, HCl (aq).
21M.2.SL.TZ2.c(i):
Write the equation for the reaction of Ca(OH)₂(aq) with hydrochloric acid, HCl (aq).
21M.2.SL.TZ1.1e(i):
Write the equation for this reaction.
21M.2.SL.TZ1.e(i):
Write the equation for this reaction.
21N.2.SL.TZ0.3a(ii):
Write an equation for the reaction of white phosphorus (P₄) with chlorine gas to form phosphorus trichloride (PCl₃).
21N.2.SL.TZ0.3c(iii): State, with a reason, the effect of an increase in temperature on the position of this equilibrium.
21N.2.SL.TZ0.a(ii):
Write an equation for the reaction of white phosphorus (P₄) with chlorine gas to form phosphorus trichloride (PCl₃).
21N.2.SL.TZ0.c(iii): State, with a reason, the effect of an increase in temperature on the position of this equilibrium.
21M.1A.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
21M.2.SL.TZ1.1d(i):
Write the equation for this reaction.
21M.2.SL.TZ1.d(i):
Write the equation for this reaction.
22M.2.SL.TZ2.5b:
Deduce the overall cell reaction including state symbols. Use section 7 of the data booklet.
22M.2.SL.TZ2.b:
Deduce the overall cell reaction including state symbols. Use section 7 of the data booklet.
22N.1A.HL.TZ0.29:
What is the coefficient for H⁺ when the equation below is balanced?

__Pb (s) + __NO₃⁻ (aq) + __H⁺ (aq) → __Pb²⁺ (aq) + __NO (g) + __H₂O (l)

A. 2

B.  4

C.  6

D.  8

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.

Reactivity 2.1.3—The limiting reactant determines the theoretical yield. Identify the limiting and excess reactants from given data.

Reactivity 2.1.4—The percentage yield is calculated from the ratio of experimental yield to theoretical yield. Solve problems involving reacting quantities, limiting and excess reactants, theoretical, experimental and percentage yields.

22M.2.SL.TZ2.3b(ii): Explain the effect of increasing temperature on the yield of SO3.
22M.2.SL.TZ1.1b(iii):
Assume the reaction in (a)(i) is the only one occurring and it goes to completion, but some product has been lost from the crucible. Deduce the percentage yield of magnesium oxide in the crucible.
22M.2.HL.TZ1.3a(iii):
With reference to the reaction quotient, Q, explain why the percentage yield increases as the pressure is increased at constant temperature.
22M.2.SL.TZ2.6b(ii): Explain the effect of increasing temperature on the yield of SO3.
19N.1A.SL.TZ0.1:
0.10 mol of hydrochloric acid is mixed with 0.10 mol of calcium carbonate.

2HCl (aq) + CaCO₃ (s) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)

Which is correct?
22M.2.SL.TZ2.3b(ii): Explain the effect of increasing temperature on the yield of SO3.
22M.2.SL.TZ2.b(ii): Explain the effect of increasing temperature on the yield of SO3.
22M.2.SL.TZ1.1b(iii):
Assume the reaction in (a)(i) is the only one occurring and it goes to completion, but some product has been lost from the crucible. Deduce the percentage yield of magnesium oxide in the crucible.
22M.2.SL.TZ1.b(iii):
Assume the reaction in (a)(i) is the only one occurring and it goes to completion, but some product has been lost from the crucible. Deduce the percentage yield of magnesium oxide in the crucible.
22M.2.HL.TZ1.3a(iii):
With reference to the reaction quotient, Q, explain why the percentage yield increases as the pressure is increased at constant temperature.
22M.2.HL.TZ1.a(iii):
With reference to the reaction quotient, Q, explain why the percentage yield increases as the pressure is increased at constant temperature.
22M.2.SL.TZ2.6b(ii): Explain the effect of increasing temperature on the yield of SO3.
22M.2.SL.TZ2.b(ii): Explain the effect of increasing temperature on the yield of SO3.
19N.1A.SL.TZ0.1:
0.10 mol of hydrochloric acid is mixed with 0.10 mol of calcium carbonate.

2HCl (aq) + CaCO₃ (s) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)

Which is correct?

Reactivity 2.1.5—The atom economy is a measure of efficiency in green chemistry. Calculate the atom economy from the stoichiometry of a reaction.

22M.2.SL.TZ1.1c(i):
Evaluate whether this, rather than the loss of product, could explain the yield found in (b)(iii).
19M.2.SL.TZ2.6c(ii):
Oil spills can be treated with an enzyme mixture to speed up decomposition.

Outline one factor to be considered when assessing the greenness of an enzyme mixture.
19N.2.SL.TZ0.19b: Suggest a concern about the disposal of solvents from drug manufacturing.
19M.2.SL.TZ1.4e:
State one factor considered when making green chemistry polymers.
19M.2.SL.TZ2.9d(ii):
Oil spills can be treated with an enzyme mixture to speed up decomposition.

Outline one factor to be considered when assessing the greenness of an enzyme mixture.
19N.2.SL.TZ0.25c: Suggest a concern about the disposal of solvents from drug manufacturing.
20N.1B.SL.TZ0.13b:
Outline a green chemistry solution for problems generated by the use of organic solvents.
22M.2.SL.TZ1.1c(i):
Evaluate whether this, rather than the loss of product, could explain the yield found in (b)(iii).
22M.2.SL.TZ1.c(i):
Evaluate whether this, rather than the loss of product, could explain the yield found in (b)(iii).
19M.2.SL.TZ2.c(ii):
Oil spills can be treated with an enzyme mixture to speed up decomposition.

Outline one factor to be considered when assessing the greenness of an enzyme mixture.
19N.2.SL.TZ0.b: Suggest a concern about the disposal of solvents from drug manufacturing.
19M.2.SL.TZ1.e:
State one factor considered when making green chemistry polymers.
19M.2.SL.TZ2.d(ii):
Oil spills can be treated with an enzyme mixture to speed up decomposition.

Outline one factor to be considered when assessing the greenness of an enzyme mixture.
19N.2.SL.TZ0.c: Suggest a concern about the disposal of solvents from drug manufacturing.
20N.1B.SL.TZ0.b:
Outline a green chemistry solution for problems generated by the use of organic solvents.