Acids, bases and neutralisation

9.Which equation represents the reaction of a base with an acid?

10.Which of the following is a weak acid?

11.Which of the following oxides is amphoteric?

12.Which statement about the reaction between an acid and a metal is correct?

13.A student adds a few drops of universal indicator to a solution of pH 4. What colour would the indicator be?

14.The pH of acid X is 5 and the pH of acid Y is 2. How many times greater is the hydrogen ion concentration in acid Y than in acid X?

15.Which of the following oxides, when added to water, would produce a solution with a pH greater than 7?

16.A student adds excess magnesium to dilute hydrochloric acid and measures the volume of gas produced over time. Which change would increase the initial rate of reaction?

17.In a titration, 25.0 cm³ of 0.10 mol/dm³ hydrochloric acid neutralises 20.0 cm³ of sodium hydroxide solution. What is the concentration of the sodium hydroxide?

18.Which ion is present in all aqueous acids?

19.A solution of propanoic acid has a pH of 5. Which statement about this solution is correct?

20.Which of the following is a neutral oxide?

21.A student adds aqueous sodium hydroxide to a solution of aluminium sulfate. A white precipitate forms which then dissolves in excess sodium hydroxide. What type of oxide is aluminium oxide?

22.Which gas is produced when a metal reacts with an acid?

23.A student tests a solution with universal indicator and gets a yellow colour. What is the approximate pH of the solution?

24.Which of the following reactions is not a neutralisation reaction?

25.A student adds excess magnesium to dilute hydrochloric acid and measures the volume of hydrogen gas produced over time. Which change would increase the initial rate of reaction?

26.A student was given an unknown substance and performed three tests: 1. On heating with ammonium chloride, a gas is released. 2. The substance turns methyl orange yellow. 3. The substance does not react with potassium carbonate. What kind of substance was the student given?

28.Which of the following statements is not correct?

29.Which of the following properties is not indicative of a base?

30.A student gradually added excess potassium hydroxide from a burette to a conical flask containing sulfuric acid as part of a rate of reaction investigation. Which statement describes the change in pH of the sulfuric acid as the aqueous potassium hydroxide was added?

31.Which of the following elements forms an oxide that can be used to neutralise an alkaline solution?

32.Propanoic acid is a weak acid. What is a possible pH for a dilute aqueous solution of propanoic acid?

33.In a reaction rate experiment, a student used equal volumes of acids P and Q to react with excess magnesium in separate conical flasks. The following observations were recorded: 1. Acid P produces hydrogen gas faster than acid Q. 2. Both gases produce the same total volume of hydrogen gas. Which statement correctly explains the student's observations?

35.Which equation does not show the correct reaction of an acid?

36.Which of the following is a property of bases?

37.Aqueous solutions of alkalis contain which ions?

38.A student adds a few drops of universal indicator to a solution of pH 8. What colour would the indicator be?

39.The pH of acid X is 4 and the pH of acid Y is 1. How many times greater is the hydrogen ion concentration in acid Y than in acid X?

40.A student tests a solution with blue litmus paper and it turns red. The solution is then tested with thymolphthalein. What colour will the thymolphthalein be?

41.In a supervised school experiment, add dilute alkali to a fixed volume of dilute acid and measure pH. What is the independent variable?

42.In a supervised school experiment, add dilute alkali to a fixed volume of dilute acid and measure pH. Which observation or quantity is the dependent variable?

43.In a supervised school experiment, add dilute alkali to a fixed volume of dilute acid and measure pH. Which decision best controls another factor in this comparison?

44.In a supervised school experiment, add dilute alkali to a fixed volume of dilute acid and measure pH. Why should the class repeat measurements or check multiple comparable observations?

45.A class is evaluating an application of acids, bases and neutralisation. Which statement identifies a relevant limitation?

46.In a supervised school experiment, add dilute alkali to a fixed volume of dilute acid and measure pH. Which conclusion is most justified by a controlled comparison?

47.In a supervised school experiment, add dilute alkali to a fixed volume of dilute acid and measure pH. Select the two practices that strengthen the validity of this comparison.

48.When evaluating evidence about acids, bases and neutralisation, select the two scientifically defensible statements.

49.Design a fair investigation for this question: In a supervised school experiment, add dilute alkali to a fixed volume of dilute acid and measure pH. Identify what to compare, what to record and one control.

50.Explain one use of the science in acids, bases and neutralisation and evaluate one limitation of the evidence or application.

51.A supervised class mixes equal volumes of hydrochloric acid and sodium hydroxide with equal concentrations. What forms if the reactants neutralise completely?

52.Two solutions both have pH 3. Can pH alone establish which acid is more concentrated?