Solved: Magnesium reacts with sulfuric acid: Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g) The... [IB Chemistry (Old)]

Solved: Magnesium reacts with sulfuric acid: Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g) The... [IB Chemistry (Old)] | RevisionDojo

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Question

SLPaper 2

Magnesium reacts with sulfuric acid:

Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g)

The graph shows the results of an experiment using excess magnesium ribbon and dilutesulfuric acid.

M17/4/CHEMI/SP2/ENG/TZ2/05.a.i

Outline why the rate of the reaction decreases with time.

[1]

Verified

Solution

concentration of acid decreases
OR
surface area of magnesium decreases

Accept “less frequency/chance/rate/probability/likelihood of collisions”.

Do not accept just “less acid” or “lessmagnesium”.

Do not accept “concentrations ofreagents decrease”.

$1 mark$

Sketch, on the same graph, the expected results if the experiment were repeatedusing powdered magnesium, keeping its mass and all other variables unchanged.

[1]

Verified

Solution

curve starting from origin with steeper gradient AND reaching same maximumvolume

$1 mark$

Nitrogen dioxide and carbon monoxide react according to the following equation:

NO2(g) + CO(g) ⇌ NO(g) + CO2(g) Δ_H_ = –226 kJ

Calculate the activation energy for the reverse reaction.

[1]

Verified

Solution

«_E_a(rev) =226 +132 =» 358 «kJ»

Do not accept –358.

$1 mark$

State the equation for the reaction of NO2 in the atmosphere to produceacid deposition.

[1]

Verified

Solution

2NO2(g) +H2O(l) → HNO3(aq) +HNO2(aq)
OR
2NO2(g) +2H2O(l) +O2(g) → 4HNO3(aq)

Accept ionised forms of the acids.

$1 mark$

Chemistry (Old) International Baccalaureate (IB) Practice Question: Magnesium reacts with sulfuric acid: Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g) The graph shows the results of an experiment...