Zadanie 1a
The data for 0.6 g of catalyst seem anomalous. Suggest a possible cause.
- Materiał graficzny
Chemistry SL Paper 3, May 2024, TZ1
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
Dodaj cały arkusz do zestawuZadanie 1b
The student hypothesized, from theory, that doubling the mass of CuO would double the rate of the catalysed reaction. (i) Suggest why it is important to state a hypothesis before an experiment is carried out. (ii) Explain how collision theory could…
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Zadanie 1c
The results in Figure 1 were processed to give Figure 2, which shows how the initial rate of reaction varies with the mass of catalyst. (i) Outline how the y-axis values in Figure 2 were obtained from the results in Figure 1. (ii) Suggest, giving a reason,…
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Zadanie 2a
Demonstrate that these data are consistent with the formula MgSO4 ⋅ 7 H2O.
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Zadanie 2b
The uncertainty in each mass reading is ±0.04 g. (i) Calculate the percentage uncertainty in the total mass loss. (ii) Using your answer to (i), calculate the absolute uncertainty in the number of moles of water per mole of MgSO4, that is the…
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Zadanie 2c
Deduce what the graph shows about the water in hydrated magnesium sulfate.
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Zadanie 3a
Potassium bromide, KBr, forms a three-dimensional lattice of ions. (i) Demonstrate how the electronegativity values and bonding triangle in sections 9 and 17 of the data booklet support an ionic model for this solid. (ii) Outline the nature of the…
Zadanie 3c
Sodium metal is manufactured by the electrolysis of molten sodium chloride. (i) Outline why sodium can be produced by electrolysis rather than by reduction with carbon. (ii) State the half-equation for the formation of sodium during the electrolysis.
Zadanie 5a
Glucose is made in the leaves of green plants by photosynthesis. Write the balanced equation for the overall reaction of photosynthesis.
Zadanie 6b
The iodine number of a fat or oil is the mass, in grams, of iodine that reacts with 100 g of the fat or oil. It is a measure of the degree of unsaturation. A 3.50 g sample of peanut oil reacts completely with 65.5 cm3 of…
Zadanie 7a
The structural formula of a synthetic tripeptide P is shown. Circle every amide link in the structure.
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Zadanie 9
Citric acid gives lemon juice its sharp taste. It dissolves very readily in water. Its structure is shown. Explain why citric acid is soluble in water, with reference to its structure.
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Zadanie 10a
Ethane forms a solid compound with water, ethane hydrate, which looks like ice but burns when ignited because the ice-like cages release ethane gas. In an idealized sample the formula is (C2H6)3(H2O)23 and the molar mass is…
Zadanie 10b
Ethane is used as a fuel. Calculate its specific energy, in kJ g−1, using the enthalpy of combustion in section 14 and the atomic masses in section 7 of the data booklet.
Zadanie 11a
Natural gas, which is mainly methane, and coal, which is mainly carbon, are both burned in power stations. Outline why burning natural gas has a lower environmental impact than burning coal.
Zadanie 13b
Diclofenac, an anti-inflammatory drug, is often supplied as its sodium salt, which dissolves in water more readily than the diclofenac molecule itself. Circle the functional group that reacts with sodium hydroxide when this salt is prepared.
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Zadanie 16a
A magnesium hydroxide antacid reacts with hydrochloric acid in the stomach. State a balanced equation for this neutralization.
Zadanie 17b
Paracetamol and phenacetin are two analgesics with similar structures. Predict, giving a reason, which of the two compounds is more soluble in water.
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