Oquizy

To test the effect of acid strength on electrical conductivity, they connect a light bulb to two solutions: 0.1 mol/dm³ HCl and 0.1 mol/dm³ CH₃COOH. Which result and explanation is correct?

Both light the bulb equally because concentration is the same. CH₃COOH lights the bulb more brightly because it's organic. HCl lights the bulb brightly because it ionises fully. Neither lights the bulb because acids don't conduct electricity.

Xinyi mixes silver nitrate and sodium chloride solutions. A white solid forms. What method is this for preparing salts?

Crystallisation Neutralisation Precipitation Titration

While walking past a leaking ammonia cylinder, John covers his nose and says, 'Smells like rotten cleaning supplies!' What property of ammonia is most relevant to this observation?

Ammonia is a colorless gas with a pungent odor Ammonia is a dense liquid at room temperature Ammonia is a weak acid with a low pH Ammonia reacts with oxygen to form nitric oxide

John wants to prepare copper(II) sulfate crystals using an insoluble base. Which steps should he follow?

Add excess copper(II) oxide to warm sulfuric acid, filter, then crystallise the filtrate Mix copper(II) sulfate with sodium chloride and evaporate React copper(II) oxide with sodium hydroxide, then crystallise Titrate copper(II) oxide with sulfuric acid directly

Xinyi mistakenly added insufficient copper(II) oxide to her sulfuric acid. What is the likely problem with the resulting solution after filtration?

It contains unreacted base It does not contain any copper ions It is neutral and ready for crystallisation It still contains excess acid

After all the experiments, John jokingly says: 'If we add more water to this acid, it'll become weaker and less dangerous!' Which is the most accurate correction Xinyi should give?

Adding water removes hydrogen ions, making it less acidic. Diluting decreases concentration, but the acid remains strong if it fully ionises. He's right. Dilution turns strong acids into weak acids. The acid becomes neutral after enough dilution.

Quiz: Chemistry - Acid-Base Chemistry