3.1 Physical chemistry

Practice questions on Physical chemistry

• Hydrogen peroxide solution decomposes slowly at room temperature into water and oxygen. Wh… (5 marks, Explain)
• Explain why poly(ethene) has a low melting point and does not conduct electricity. (5 marks, Explain)
• A student prepares two separate solutions: a 0.1 mol/dm³ solution of sulfuric acid and a 0… (5 marks, Explain)
• A student adds a small piece of marble (calcium carbonate) to dilute hydrochloric acid. Th… (5 marks, Explain)
• Explain how the atomic model changed after the discovery of the nucleus, and describe the … (5 marks, Explain)
• Describe how scientists' understanding of atomic structure developed from Dalton's model t… (5 marks, Describe)
• A student investigates the energy change when zinc powder is added to copper sulfate solut… (5 marks, Explain and Describe)
• Hydrogen peroxide solution decomposes slowly at room temperature. When manganese(IV) oxide… (5 marks, Explain)
• Explain why scientists changed the plum pudding model of the atom after the results of the… (5 marks, Explain)
• Explain why electrons in an atom can be found at different distances from the nucleus, and… (5 marks, Explain)
• Explain how electrons are arranged in an atom and describe what happens to this arrangemen… (5 marks, Explain)
• A student sets up a sealed flask containing the following reversible reaction at constant … (5 marks, Explain)
• Carbon monoxide reacts with steam in a reversible reaction: CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g… (5 marks, Explain)
• Explain what happens in terms of oxygen and electrons during the reaction between copper(I… (5 marks, Explain)
• A student mixes sodium hydroxide solution with hydrochloric acid in a polystyrene cup. The… (5 marks, Explain)
• Explain why magnesium has a high melting point and can conduct electricity. (5 marks, Explain)
• Explain why graphite can conduct electricity but diamond cannot, even though both are form… (5 marks, Explain)
• Explain what is meant by the term 'mole' and describe how the molar mass of a substance is… (5 marks, Explain)
• Explain how the law of conservation of mass applies to a chemical reaction carried out in … (5 marks, Explain)
• Hydrogen peroxide decomposes to form water and oxygen. The activation energy for this reac… (5 marks, Explain)