Pure Substances (GCSE Chemistry)

What is the immediate observable result when silver nitrate solution is added to an acidified solution that contains chloride ions?

When excess solid carbonate remains after adding it to acid to make a salt, which observation would show that the carbonate is in excess?

Which reagent and observation identifies carbonate ions specifically (not sulfate or halides)?

Which statement correctly describes why an instrumental technique is often preferred over a simple spot test in chemical analysis?

Which single step is essential to obtain pure dry crystals from a salt solution after dissolving and filtering?

Which test result indicates the presence of ammonia gas?

Which of the following best describes a pure chemical substance?

Why does the Rf value of a dye not change when the solvent front is allowed to travel farther up the paper?

Which colour is produced in a flame test for sodium ions?

What is one clear advantage of using an instrumental technique (e.g., flame emission spectroscopy) rather than just a simple chemical test to detect metal ions?

Which test and observation distinguish bromide ions from iodide ions when treated with acidified silver nitrate?