A-LevelChemistryChemical periodicityMay/June 2019Paper 2 Q313 Marks
Period 3 elements react with chlorine gas, Cl₂(g), to form chlorides. (a) The table shows the differences in observations which occur when two Period 3 chlorides are added to water. Period 3 chloride | observations when added to water | pH of solution formed with water ---|---|--- NaCl | White solid disappears. Colourless solution made. | 7 SiCl₄ | Pale yellow solution forms. Bubbles form and the test-tube feels hot. White precipitate forms. | 1-2
✓ Correct Answer
The correct answer is —. This question tests the candidate's understanding of chemical periodicity within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep