Alkali metals

9.In a demonstration of sodium reacting with water, which safety precaution is likely to be taken?

10.What is the trend in melting points as you go down group 1?

11.Which of the following is the correct word equation for the reaction of caesium with water?

12.True or false: Alkali metals are very reactive.

13.A student measures the pH of a solution formed when a small piece of an alkali metal is added to water. The pH reading is 13. What does this indicate about the solution?

14.In an experiment, 0.1 g of lithium is reacted with excess water. The hydrogen gas produced is collected and measured at room temperature and pressure. Which of the following is the most likely volume of hydrogen collected? (Assume 1 mole of gas occupies 24 dm³ at room temperature and pressure; Ar: Li = 7)

15.A student is given three unlabelled samples of alkali metals: lithium, sodium, and potassium. They add a small piece of each to water and observe the reactions. Which of the following observations would correctly identify potassium?

16.The table below shows the melting points of three alkali metals. Which of the following is the most likely melting point of rubidium?

17.Which of the following is a property of all alkali metals?

18.A student writes the word equation for the reaction of sodium with water as: sodium + water → sodium oxide + hydrogen. Is this equation correct?

19.The graph shows the trend in melting points of alkali metals down group 1. Which of the following best describes the trend?

20.A student observes that when a small piece of an alkali metal is added to water, it floats and moves around the surface. Which property of alkali metals explains why it floats?

21.In a demonstration, a teacher adds a piece of sodium to water. Which of the following safety precautions is most important?

22.Which of the following word equations correctly represents the reaction of caesium with water?

23.Alkaline solutions have a pH that is:

24.A student compares the reactions of lithium and potassium with water. Which of the following is a correct observation?

25.In a demonstration of the reaction between sodium and water, which safety precaution is most important?

26.A student observes that when a small piece of lithium is added to water, it fizzes. What causes the fizzing?

27.Complete the word equation: alkali metal + water → ? + hydrogen

28.In an experiment, 0.1 g of lithium is reacted with excess water. The hydrogen gas produced is collected and measured at room temperature and pressure. Which of the following is the most likely volume of hydrogen gas produced? (Assume 1 mole of gas occupies 24 dm³ at room temperature and pressure; atomic masses: Li = 7, O = 16, H = 1)

29.What is the trend in melting points of alkali metals as you go down group 1?

30.A student adds a 0.2 g piece of lithium to excess water and collects the hydrogen gas produced. At room temperature and pressure, 0.29 dm³ of hydrogen is collected. Which of the following is the most likely volume of hydrogen produced if 0.2 g of sodium is used instead? (Assume same conditions and that both metals react completely. Relative atomic masses: Li=7, Na=23. 1 mol of gas occupies 24 dm³ at rtp.)

31.The table shows the melting points of three alkali metals. Which is the most likely melting point of rubidium?

32.A teacher demonstrates the reaction of sodium with water behind a safety screen. Which of the following best explains why the safety screen is used?

33.Which of the following is a word equation for the reaction of lithium with water?

34.A sample of an alkali metal is cut with a knife and a shiny surface is observed. After a few minutes, the surface becomes dull. Which property of alkali metals does this demonstrate?

35.0.1 g of lithium is reacted with excess water. The hydrogen gas produced is collected at room temperature and pressure. Which of the following volumes of hydrogen is most likely to be collected? (Relative atomic mass: Li = 7; 1 mole of gas occupies 24 dm³ at rtp)

36.A student adds a small piece of potassium to water and observes a lilac flame. What is the most likely reason for the flame?

37.Which of the following statements about alkali metals is true?

38.Which of the following is the correct general word equation for the reaction of an alkali metal with water?

39.The diagram shows the electron configuration of a sodium atom. Which group of the periodic table does sodium belong to?

40.What is the pH of the solution formed when an alkali metal reacts with water?

41.The reactivity of the alkali metals goes up as you go up group 1.

42.The melting points of the alkali metals go up as you go up group 1.

43.The alkali metals react strongly with water.

44.The alkali metals all have high melting points.

45.Alkaline solutions have a pH greater than 7.

46.Alkali metals are usually stored in oil.

47.Match each alkali metal to the correct observation when a small piece is added to water.

48.Arrange the following alkali metals in order of increasing reactivity (least reactive first).

49.Which of the following are properties of alkali metals? Select all that apply.

50.The melting points of alkali metals increase as you go down group 1.

51.Complete the general word equation for the reaction between an alkali metal and water.

52.Complete the word equation for the reaction between sodium and water.

53.State an alkali metal which will have a stronger reaction with water than sodium.

54.Complete the word equation for the reaction between lithium and water.

55.Complete the word equation for the reaction between rubidium and water.

56.State two safety precautions a teacher is likely to take when demonstrating the reaction between sodium and water.

57.Complete the word equation for the reaction of lithium with water.

58.State two safety precautions a teacher should take when demonstrating the reaction of sodium with water.

59.A 0.1 g piece of lithium (relative atomic mass 7) is added to excess water. Calculate the volume of hydrogen gas produced at room temperature and pressure (24 dm³/mol). Give your answer in dm³.

60.A 0.1 g piece of lithium (relative atomic mass 7) is added to excess water. Calculate the volume of hydrogen gas produced at room temperature and pressure (24 dm³/mol). Give your answer in dm³.