Xinyi is learning about the differences between acids and alkalis in school. Which ion is characteristic for all acidic solutions?

John added Universal Indicator to two solutions, A and B. Solution A turned red, and B turned purple. What can be concluded about the solutions?

During a science practical, Xinyi mixed hydrochloric acid with sodium hydroxide. What is the ionic equation for this reaction?

John said ethanoic acid is dangerous because it is concentrated. Which statement best explains the strength of ethanoic acid?

Xinyi classifies oxides. She tests aluminium oxide with both acids and alkalis. Which observation supports that it is amphoteric?

Xinyi tests an oxide that reacts with both HCl and NaOH. How should it be classified?

John found an old fertilizer bag labeled 'Ammonium Sulfate'. He wonders what happens if lime is added to this fertilizer on soil. Xinyi explains the likely issue:

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?

John decides to write a balanced chemical equation for ammonia production but messes up. Which is the correct balanced equation for the Haber process?

John wants to prepare sodium chloride in the lab using an acid and a base. Which pair of reactants should he choose?

Which salt is soluble in water?

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