Chemistry SL Paper 2, May 2023, TZ2

Chemia IBPaper 2, maj 2023, TZ2wzorowane3 pktobliczenioweśrednie (szac.)

Zadanie 1a

Determine the empirical formula of X.

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktobliczeniowełatwe (szac.)

Zadanie 1c

The molar mass of X is 88.1 g mol⁻¹. Determine the molecular formula of X.

Chemia IBPaper 2, maj 2023, TZ2wzorowane2 pktobliczeniowełatwe (szac.)

Zadanie 2a

In air, sulfur dioxide can be oxidized to sulfur trioxide. The reaction is reversible, and at high temperature it reaches equilibrium in a closed container. 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) (i) At 600 °C the equilibrium constant, K, for this reaction is…

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktotwarteśrednie (szac.)

Zadanie 2b

Ozone, O₃, is formed in photochemical smog from oxygen molecules and oxygen atoms. Deduce the Lewis structure of ozone.

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktotwarteśrednie (szac.)

Zadanie 2c

Predict the O-O-O bond angle in ozone, O₃.

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 2d

Acid deposition forms when oxides of sulfur dissolve in water in the atmosphere. Write an equation for sulfur(VI) oxide reacting with water to produce an acid.

Chemia IBPaper 2, maj 2023, TZ2wzorowane4 pktotwarteśrednie (szac.)

Zadanie 3a

Molten lithium bromide, LiBr(l), is electrolysed using inert graphite electrodes, as shown in the diagram. (i) Identify the product formed at the cathode. (ii) State the direction in which the electrons flow in the external circuit, referring to the…

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Chemia IBPaper 2, maj 2023, TZ2wzorowane3 pktobliczeniowetrudne (szac.)

Zadanie 3b

The concentration of dissolved oxygen in a sample of pond water was determined by the Winkler method. The reactions that take place are:…

Chemia IBPaper 2, maj 2023, TZ2wzorowane2 pktotwartełatwe (szac.)

Zadanie 4a

Tellurium has atomic number 52. Using the position of tellurium in the periodic table, deduce two features of its electron configuration.

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 4b

Outline why copper is malleable.

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktobliczeniowełatwe (szac.)

Zadanie 4c

A 15.40 g block of pure copper is heated from 20.0 °C to 45.0 °C. Calculate the heat energy absorbed, in J. The specific heat capacity of copper is 0.385 J g⁻¹ K⁻¹.

Chemia IBPaper 2, maj 2023, TZ2wzorowane2 pktobliczeniowełatwe (szac.)

Zadanie 4d

Neon has three naturally occurring isotopes, $\ce{^{20}Ne}$, $\ce{^{21}Ne}$ and $\ce{^{22}Ne}$. A sample of neon contains 90.2 % of $\ce{^{20}Ne}$, 0.3 % of $\ce{^{21}Ne}$ and 9.5 % of $\ce{^{22}Ne}$. Calculate the relative atomic mass of this sample, giving…

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktotwarteśrednie (szac.)

Zadanie 4e

State the full electron configuration of the nickel(II) ion, Ni²⁺.

Chemia IBPaper 2, maj 2023, TZ2wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 5a

Calculate the pH of the potassium hydroxide solution.

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 5b

Write an equation for the reaction between ethanoic acid and potassium hydroxide.

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktobliczeniowełatwe (szac.)

Zadanie 5c

A volume of 21.6 cm³ of KOH(aq) neutralized 25.0 cm³ of the ethanoic acid solution. Determine the concentration of the ethanoic acid.

Chemia IBPaper 2, maj 2023, TZ2wzorowane2 pktotwartełatwe (szac.)

Zadanie 6a

Suggest how the rate of this reaction could be determined experimentally.

Chemia IBPaper 2, maj 2023, TZ2wzorowane2 pktotwarteśrednie (szac.)

Zadanie 6b

Explain how a catalyst such as manganese(IV) oxide increases the rate of this reaction.

Chemia IBPaper 2, maj 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 6c

Propanoic acid reacts with methanol to produce an ester. Draw the full structural formula of the organic product.

Chemia IBPaper 2, maj 2023, TZ2wzorowane4 pktobliczenioweśrednie (szac.)

Zadanie 6d

(i) Write the equation for the complete combustion of propan-1-ol, CH₃CH₂CH₂OH. (ii) Determine the enthalpy change, in kJ mol⁻¹, for the combustion of gaseous propan-1-ol to give gaseous carbon dioxide and gaseous water, using bond…

Chemia IBPaper 2, maj 2023, TZ2wzorowane3 pktotwartełatwe (szac.)

Zadanie 6e

Hex-3-ene, CH₃CH₂CH=CHCH₂CH₃, reacts with chlorine, Cl₂. (i) Identify the type of reaction that takes place. (ii) Predict the structural formula of the organic product of this reaction. (iii) Hex-3-ene can also undergo addition polymerization.…