Properties Uses And Alloys Of Metals

9.Metals are good conductors of heat and electricity because they have delocalised electrons.

10.Alloys are chemically combined compounds.

11.Complete the sentence.

12.Which of the following is a physical property of most metals?

13.Which of the following is an alloy of copper and zinc?

14.Arrange the following steps in the order they occur when explaining why alloys are harder than pure metals.

15.Match each metal to its use based on properties.

16.Which of the following are properties of stainless steel? (Select all that apply)

17.Copper reacts with water to form copper oxide and hydrogen gas.

18.Which property makes copper suitable for electrical wiring?

19.Match each metal to its most suitable use based on properties.

20.Which of the following are properties of most metals? (Select all that apply)

21.Arrange the following statements in the correct order to explain why alloys are harder than pure metals.

22.An alloy is a mixture of a metal with other elements.

23.Which property makes aluminium suitable for making overhead power cables?

24.What is the main reason metals are good conductors of electricity?

25.Which of the following are common uses of copper? (Select all that apply)

26.Match each alloy to its composition.

27.Why are alloys usually harder than pure metals?

28.Copper reacts with cold water to produce copper oxide and hydrogen gas.

29.A student tests four metals W, X, Y, Z with dilute hydrochloric acid. W fizzes vigorously, X fizzes slowly, Y does not react, Z reacts with steam but not with cold water. Which is the correct order of reactivity (most reactive first)?

30.A student investigates the reaction of four metals with dilute hydrochloric acid. The table shows the results: | Metal | Observation | |-------|-------------| | W | vigorous bubbling | | X | slow bubbling | | Y | no reaction | | Z | reacts with steam but not with cold water | Which metal is the least reactive?

31.A student sets up an experiment to compare the reactivity of magnesium and zinc with steam. Which observation would indicate that magnesium is more reactive than zinc?

32.A student tests four metals (P, Q, R, S) with dilute hydrochloric acid and records the time taken for the metal to disappear completely. The results are: P: 15 seconds, Q: 45 seconds, R: no reaction, S: 120 seconds. Which statements are correct? (Select all that apply)

33.Aluminium is used for food cans because it is toxic.

34.Match each metal to its most suitable use based on its properties.

35.A student investigates the reaction of a metal with steam. The apparatus includes a boiling tube, a heat source, and a delivery tube leading to a trough of water. Which safety precaution is most important?

36.Arrange the following statements in the correct order to explain why alloys are usually harder than pure metals.

37.A student tests four metals W, X, Y, Z with dilute hydrochloric acid. W fizzes vigorously, X fizzes slowly, Y does not react, Z reacts with steam but not with cold water. Which metal is most reactive?

38.A student tests four metals W, X, Y, Z with dilute hydrochloric acid. W fizzes vigorously, X fizzes slowly, Y does not react, Z reacts with steam but not with cold water. Which metal is the least reactive?

39.A student investigates the reaction of four metals with dilute hydrochloric acid. The table shows the time taken for each metal to disappear completely. | Metal | Time (s) | |-------|----------| | P | 15 | | Q | 45 | | R | no reaction | | S | 5 | Which metal is the most reactive?

40.A student investigates the reaction of four metals (P, Q, R, S) with dilute hydrochloric acid. The table shows the time taken for each metal to disappear completely: | Metal | Time (s) | |-------|----------| | P | 15 | | Q | 45 | | R | no reaction | | S | 30 | Which metal is the most reactive?

41.A student sets up an experiment to compare the reactivity of magnesium and zinc with steam. Which observations would indicate that magnesium is more reactive than zinc? (Select all that apply)

42.Arrange the following steps in the correct order to explain why alloys are usually harder than pure metals.

43.A student tests four metals (W, X, Y, Z) with dilute hydrochloric acid. W fizzes vigorously, X fizzes slowly, Y does not react, Z reacts with steam but not with cold water. Which order shows the metals from most reactive to least reactive?

44.Alloys are compounds formed by chemical combination of metals.

45.Metals are malleable because layers of positive ions can slide over each other.

46.Match each alloy to its correct composition.

47.State one physical property that makes aluminium suitable for making aeroplane bodies.

48.In the reaction of zinc with steam, what is the formula of the zinc compound formed? Enter the number of atoms of oxygen in the product.

49.Complete the sentences about the reaction of metals with water.

50.In the reaction of zinc with steam, zinc oxide (ZnO) is produced. How many oxygen atoms are in one formula unit of zinc oxide?

51.State one physical property that makes aluminium suitable for making food cans.

52.Explain why metals are good conductors of electricity.

53.Describe how the structure of an alloy differs from that of a pure metal, and explain how this difference affects the hardness of the alloy.

54.Explain why alloys are usually harder than pure metals. Use ideas about the structure of metals in your answer.

55.In the reaction of zinc with steam, what is the formula of the zinc compound formed? Enter the number of atoms of oxygen in the product.

56.In the reaction of zinc with steam, zinc oxide (ZnO) is produced. How many oxygen atoms are in one formula unit of zinc oxide?