"Explain" questions — Edexcel A-Level Chemistry (9CH0)
174 questions · chemistry · View as Markdown
How to answer
WHAT + WHY. Every point paired with a because. Structure: X happens because Y. This causes Z because … Assessment Objective: AO2. Every "explain" answer on this spec is marked against exactly this pattern.
Sample questions
- Ammonia (NH₃) is a covalently bonded molecule with a non-linear, trigonal pyramidal shape. Explain why ammonia is descri…
- A student investigates the decomposition of hydrogen peroxide solution at two different temperatures. At the higher temp…
- Nylon-6,6 is a synthetic polyamide made from two monomers: hexane-1,6-diamine (a diamine) and hexanedioic acid (a dicarb…
- Polymers can be divided into two main types based on how they are formed: addition polymers and condensation polymers. E…
- A conservation scientist wants to identify the chemical compounds present in a sample of ancient plant resin found at an…
- Mass spectrometry and infrared spectroscopy are two modern analytical techniques used to identify unknown compounds. Exp…
- Explain why the lattice enthalpy of magnesium oxide is much more negative than the lattice enthalpy of sodium chloride.
- A forensic scientist analyses a white powder found at a crime scene. The scientist dissolves the powder in distilled wat…