Pearson Edexcel International GCSE Chemistry (4CH1) · EDEXCEL 4CH1
1 Principles of chemistry
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Principles of chemistry
- Sodium has the atomic number 11 and a relative atomic mass of approximately 23. State the … (4 marks, State and Explain)
- Explain why atoms of the same element can have different mass numbers. (4 marks, Explain)
- Calcium has atomic number 20 and mass number 40. Describe the structure of a calcium atom,… (4 marks, Describe)
- An atom of element X has an atomic number of 11 and a mass number of 23. State the number … (4 marks, State)
- Explain why two atoms of the same element can have different mass numbers. (4 marks, Explain)
- When water is heated from room temperature until it boils, its particles gain energy and t… (4 marks, Explain)
- Solid carbon dioxide (dry ice) turns directly into a gas at −78 °C without first becoming … (4 marks, Explain)
- When a liquid is heated to its boiling point, it changes into a gas. Explain, in terms of … (4 marks, Explain)
- Atoms contain subatomic particles. State the name, relative charge, and relative mass of e… (4 marks, State)
- Calcium carbonate has the formula CaCO₃. Explain how to calculate the relative formula mas… (4 marks, Explain)
- Chlorine has two stable isotopes: chlorine-35 and chlorine-37. Describe what is meant by t… (4 marks, Describe)
- Chlorine has two naturally occurring isotopes: chlorine-35 and chlorine-37. Describe what … (4 marks, Describe)
- Describe the arrangement and movement of particles in a liquid, and explain why a liquid c… (4 marks, Describe)
- Magnesium has atomic number 12. Describe the structure of a magnesium atom, including the … (4 marks, Describe)
- Explain why a gas can be compressed into a much smaller volume, but a solid cannot be comp… (4 marks, Explain)
- Ammonium sulfate, (NH₄)₂SO₄, is used as a fertiliser. State what is meant by the term rela… (4 marks, State)
- Iron reacts with sulfur to form iron(II) sulfide. The balanced symbol equation for this re… (4 marks, Explain)
- Sodium carbonate has the formula Na₂CO₃. State the number of atoms of each element present… (4 marks, Explain)
- Calcium chloride has the formula CaCl₂. Hydrogen chloride has the formula HCl. Explain the… (4 marks, Explain)
- Aluminium sulfate has the formula Al₂(SO₄)₃. State the number of atoms of each element pre… (4 marks, State)
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