6.3. Reversible reactions and equilibrium
A subsection of Chemistry, 5070, through 6. Chemical reactions
Listing 10 of 186 questions
Sulfuric acid is made by the Contact process. 2SO2+ O22SO3ΔH = −197 kJ / mol Name the catalyst used in the Contact process. Describe how and explain why the position of equilibrium in the reaction is altered when: the temperature of the equilibrium mixture is increased at constant pressure the pressure of the equilibrium mixture is increased at constant temperature. The final step in the manufacture of sulfuric acid is an exothermic reaction. H2S2O7 + H2O 2H2SO4 On the axes, draw a labelled energy profile diagram for this exothermic reaction. Show: • the reactants and product • the enthalpy change for the reaction • the activation energy of the reaction. progress of reaction energy Air is a raw material used in the manufacture of sulfuric acid. Name one other raw material used in the manufacture of sulfuric acid. State one major use of sulfuric acid.
5070_w19_qp_22
THEORY
2019
Paper 2, Variant 2
View
This question is about some compounds of sulfur. Dilute sulfuric acid reacts with aqueous sodium hydroxide as shown. H2SO4+ 2NaOHNa2SO4+ 2H2OA student titrates 25.0 cm3 of dilute sulfuric acid with sodium hydroxide of concentration 0.0150 mol / dm3, using litmus as an indicator. A volume of 24.0 cm3 of aqueous sodium hydroxide reacts exactly with the dilute sulfuric acid. Calculate the concentration of the dilute sulfuric acid. concentration of dilute sulfuric acid mol / dm3 Describe how to prepare pure dry crystals of sodium sulfate from aqueous sodium sulfate. Concentrated sulfuric acid oxidises arsenic to arsenic(oxide. Complete the equation for this reaction. As + … H2SO4 As4O6 + H2O + 6SO2 Sulfur dichloride, Cl ─ S ─ Cl, has a simple molecular structure. Complete the dot-and-cross diagram for a molecule of sulfur dichloride. Include only the outer shell electrons. Cl S Cl The melting point of sulfur dichloride is –121 °C. The boiling point of sulfur dichloride is 59 °C. Deduce the state of sulfur dichloride at room temperature. Give a reason for your answer.
5070_w20_qp_22
THEORY
2020
Paper 2, Variant 2
View
Questions Discovered
186