"State and explain" questions — Pearson Edexcel International GCSE Chemistry (4CH1)
10 questions · chemistry · View as Markdown
How to answer
"state and explain" questions from Pearson Edexcel International GCSE Chemistry (4CH1). Read the rubric carefully — the marking points cluster into scientific ideas rather than free-form prose.
Sample questions
- Nitrogen has atomic number 7 and mass number 14. A different isotope of nitrogen has mass number 15. State the number of…
- Methane, ethane and propane are the first three members of the alkane homologous series. State the molecular formula of …
- A student carries out tests on an unknown solution to identify the anions present. First, dilute nitric acid is added, f…
- Chlorine water is added separately to two test tubes, one containing potassium bromide solution and another containing p…
- Lithium, sodium and potassium are all alkali metals. A student carries out flame tests on compounds of each of these met…
- Iron has atomic number 26 and mass number 56. State the number of protons, neutrons and electrons in one atom of iron. E…
- But-1-ene and but-2-ene are both members of the alkene homologous series and have the same molecular formula, C₄H₈. Stat…
- Sodium has the atomic number 11 and a relative atomic mass of approximately 23. State the number of protons, neutrons an…