Soluble Salts (GCSE Chemistry)

Which description best explains why crystals are formed by cooling a warm saturated solution rather than by boiling away all the solvent?

A teacher asks which of these salts is soluble in water at room temperature. Which is correct?

Why is it important to repeat an experiment and take a mean when preparing a soluble salt or measuring yield?

Which observation shows that a metal carbonate is in excess when added to excess hydrochloric acid during salt preparation?

Why is a water bath preferred over direct flame when gently heating a filtrate to form crystals?

When preparing a soluble salt from an insoluble carbonate, what gas is evolved and how can you test for it?

A student makes a soluble salt by reacting a soluble base with an acid and obtains a cloudy filtrate due to an impurity. Which step should be added to purify the salt solution before crystallisation?

When preparing a soluble salt by reacting an insoluble metal oxide with acid, why is it common to add the metal oxide until it is in excess before filtering?

In preparing crystals of copper(II) sulfate from copper(II) oxide and sulfuric acid, which observation indicates the reaction is complete (acid used up)?

Which statement about the solubility of salts is correct?

Which of these describes the correct sequence of steps to obtain dried crystals from a clear salt solution?