Oquizy

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

Xinyi challenges John: 'If 1000 moles of nitrogen react with excess hydrogen at 250 atm and 450°C, assuming 15% conversion per pass, how many moles of ammonia are produced in one pass?'

1000 150 300 500

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

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

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?

A and B are both neutral A is acidic; B is alkaline A is alkaline; B is acidic A is neutral; B is acidic

Which of the following salts is *not* commonly prepared by the titration method?

Ammonium sulfate Copper(II) sulfate Potassium nitrate Sodium chloride

Quiz: Chemistry - Acid-Base Chemistry