Oquizy

John attempts to prepare lead(II) sulfate in the lab. Which pair of solutions will give him the desired product through precipitation?

Lead(II) carbonate and hydrochloric acid Lead(II) nitrate and sodium chloride Lead(II) nitrate and sulfuric acid Lead(II) oxide and nitric acid

Xinyi warms a mixture of ammonium chloride and sodium hydroxide. Damp red litmus paper held near the mouth of the test tube turns blue. What type of reaction occurred?

Acid-base reaction releasing ammonia Displacement reaction Neutralisation without gas release Thermal decomposition

Which salt is soluble in water?

Barium sulfate Lead(II) iodide Potassium nitrate Silver chloride

They test soil samples for acidity. Xinyi suggests adding calcium carbonate, but John worries about gas release affecting nearby experiments. Which gas is he worried about and why?

Ammonia, from nitrogenous compounds Carbon dioxide, from reaction with soil acids Hydrogen, from reaction with water in soil Oxygen, from decomposition of carbonate

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:

Ammonia gas will be lost to the air Calcium sulfate will form, making the soil hard Nothing significant happens The soil will become too acidic

While standing near the fertilizer storage, John asks why factories don't just lower the temperature even further in the Haber process to get more ammonia. Xinyi rolls her eyes and says the main reason is:

Ammonia decomposes quickly at low temperatures High temperature prevents ammonia poisoning Lower temperatures cause excess hydrogen to form The reaction rate would be too slow for practical production

Quiz: Chemistry - Acid-Base Chemistry