Back to the full dot-point answer
WalesChemistryQuick questions
Unit 3: Physical and Inorganic Chemistry
Quick questions on Chemistry of the p-block - WJEC A-Level Chemistry
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are period 3 chlorides?Show answer
The chlorides change character across the period in step with the bonding. Sodium and magnesium chlorides are ionic solids that dissolve to give roughly neutral solutions. Aluminium chloride is covalent (it sublimes and exists as dimers) and hydrolyses in water to give an acidic solution. Silicon tetrachloride and phosphorus chlorides are simple covalent molecules that hydrolyse vigorously, fuming in moist air as they release hydrogen chloride: .
What is lead in pigments and stability?Show answer
The inert pair effect explains why lead's stable ion is , underlying lead(II) compounds used historically in paints and glazes. Halide tests in analysis. The silver nitrate then ammonia sequence is the standard qualitative test for chloride, bromide and iodide in water and unknown salts.
What is q1?Show answer
Classify aluminium oxide as acidic, basic or amphoteric. [1 mark]
What is q2?Show answer
State the colour of the precipitate when silver nitrate is added to aqueous sodium iodide. [1 mark]
What is q3?Show answer
State why the silver(I) ion test for halides is carried out in acidic conditions. [1 mark]
What is q4?Show answer
Write the equation for the hydrolysis of silicon tetrachloride. [1 mark]
What is q5?Show answer
State the test result for ammonium ions with warm sodium hydroxide. [1 mark]
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.