Chemistry SL Paper 2, November 2024

Chemia IBPaper 2, listopad 2024wzorowane8 pktotwarteśrednie (szac.)

Zadanie 1a

The graph shows the boiling points of the straight-chain alkenes with a terminal double bond, from ethene to hex-1-ene. (i) Explain why the boiling point rises from ethene to but-1-ene. (ii) A sample of but-1-ene is warmed from 250 K to 300 K at constant…

• Materiał graficzny

Chemia IBPaper 2, listopad 2024wzorowane5 pktotwarteśrednie (szac.)

Zadanie 1b

Ethane reacts with bromine gas, Br₂(g), in the presence of UV light to form bromoethane. (i) State the type of this reaction and the name of its mechanism. (ii) Explain the mechanism of this reaction by writing equations for one initiation step, two…

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Zadanie 1c

1-Bromopropane can be converted into propan-1-ol. Identify a suitable reagent and the conditions needed for this conversion.

Chemia IBPaper 2, listopad 2024wzorowane2 pktotwartełatwe (szac.)

Zadanie 2a

In the solid state, calcium, Ca, and calcium chloride, CaCl₂, are each built as a regular three-dimensional lattice. Predict the electrical conductivity of Ca(s) and of CaCl₂(s), giving a reason for each.

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Zadanie 2b

An electrolytic cell is made using inert electrodes and molten calcium chloride, CaCl₂(l). State the half-equation for the reaction occurring at each electrode. Anode (positive electrode): Cathode (negative electrode):

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Zadanie 2c

Give the number of protons, electrons and neutrons in the calcium ion, $\ce{^{44}_{20}Ca^{2+}}$.

Chemia IBPaper 2, listopad 2024wzorowane5 pktobliczenioweśrednie (szac.)

Zadanie 2d

Calcium reacts with water to form calcium hydroxide solution and hydrogen gas. Ca(s) + 2 H₂O(l) → Ca(OH)₂(aq) + H₂(g) (i) Use the thermochemical equations in the table to calculate the enthalpy change, in kJ, when 8.00 g of calcium reacts completely…

• Tabela do uzupełnienia

Chemia IBPaper 2, listopad 2024wzorowane3 pktotwarteśrednie (szac.)

Zadanie 3a

Sulfur dioxide, SO₂, can be represented by more than one Lewis (electron dot) structure. (i) Sketch a Lewis (electron dot) structure of SO₂ in which all atoms obey the octet rule. (ii) State the molecular geometry of SO₂ and the O-S-O bond…

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Zadanie 3b

Suggest why sulfur dioxide released into the atmosphere is an environmental concern.

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Zadanie 3d

Sulfuryl chloride, SO₂Cl₂, is made industrially from sulfur dioxide and chlorine in the presence of an activated carbon catalyst. SO₂(g) + Cl₂(g) ⇌ SO₂Cl₂(g) ΔH^⊖ < 0 (i) Sketch a potential energy profile for the forward reaction,…

Chemia IBPaper 2, listopad 2024wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 4a

In a titration, 25.00 cm³ of a 0.120 mol dm⁻³ solution of a weak monoprotic organic acid, HA, was neutralized by adding sodium hydroxide solution, NaOH(aq), from a burette. The pH curve obtained is shown. Determine the concentration,…

• Materiał graficzny

Chemia IBPaper 2, listopad 2024wzorowane2 pktotwartełatwe (szac.)

Zadanie 4d

Outline how 0.100 mol dm⁻³ solutions of ethanoic acid and nitric acid could be told apart.