Some examples from this set of practice questions
1.
A student adds a small volume of aqueous silver nitrate to an aqueous solution of bromide ions in a test-tube. The student then adds a similar volume of dilute aqueous ammonia to the same test-tube. Describe what the student would see in the test-tube after the addition of aqueous ammonia.
Answer: A cream precipitate would form.
2.
Chlorine reacts with aqueous sodium hydroxide to form bleach. Write the equation and state the conditions for this reaction. Include the conditions.
Answer: Equation 2NaOH + Cl2 NaCl + NaClO + H2O Conditions cold AND dilute (sodium hydroxide)
3.
The student is provided with an aqueous solution of calcium bromide that is contaminated with calcium iodide. The student carries out a chemical test with silver ions but this time needs to add a second reagent to show that iodide ions are present. State the second reagent that the student would need to add.
Answer: concentrated (aqueous) NH3
4.
In drinking water, HClO kills bacteria. Write an equation to show how HClO can form in drinking water
Answer: Cl2 + H2O HClO + HCl
5.
Some scientists believe that chlorine compounds should not be present in drinking water. Suggest one reason why scientists may be worried by the presence of these compounds.
Answer: Chlorine compounds are carcinogenic Chlorine compounds are toxic/ poisonous
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