Esercizi Interattivi

4. Complete the map with the correct words.

METALS
Found in 1. or in the free state.

In the form of crystalline 2. , they:
• easily form 3.
• have delocalised 4.
• bond easily
• form stable compounds

Physical, thermal, electrical properties:
• lustre: shiny, reflective 5.
• state: solid at 6. temperature
• high melting and 7. points
• excellent 8. and thermal conductors

Chemical properties:
• 9. : different among different metals
• alloys: enhanced 10.

Mechanical properties:
• malleability: hammered or rolled into 11.
• ductility: stretched into 12.
• 13. : resistance to tension and compression

5.1 Answer the question: what are ores? aperta

5.2 Answer the question: how are atoms arranged in a metal structure? aperta

5.3 Answer the question: what are some features of all metals? aperta

5.4 Answer the question: what does lustre refer to? aperta

5.5 Answer the question: why are metals good electrical and thermal conductors? aperta

5.6 Answer the question: what is the difference between alkali and noble metals? aperta

5.7 Answer the question: why are metals malleable? aperta

5.8 Answer the question: what does metals strength refer to? aperta

6.1 Watch the video, then answer the question, choosing the correct option: which of the following statements is not true?

a) The six alkali metals are all soft. b) They can all be cut with a knife. c) They cannot be heated. d) Sodium is an alkali metal.

6.2 After watching the video in the previous exercise, answer the question choosing the correct option: what happens with lithium?

a) After cutting, the black coat quickly reappears. b) It explodes when in contact with water. c) There is no metallic lustre. d) It doesn’t react with water.

6.3 After watching the video in Exercise 6.1, answer the question choosing the correct option: under which substance is sodium kept to prevent reaction with air?

a) Oil. b) Water. c) Azote. d) Calcium.

6.4 After watching the video in Exercise 6.1, answer the question choosing the correct option: why is it hard to see the metallic lustre when you slice potassium?

a) Because it does not react with air at all. b) Because the corrosion with air is too quick. c) Because it is not soft. d) None of the above.

6.5 After watching the video in Exercise 6.1, answer the question choosing the correct option: which of the following statements is true?

a) Alkali metals do not react with water. b) Alkali metals cannot float on water. c) Alkali metals do not react in water in the same way. d) Alkali metals react in water in the same way.

6.6 After watching the video in Exercise 6.1, answer the question choosing the correct option: what does the reaction between potassium and water produce?

a) An alloy. b) A flame. c) A gas. d) Black coating.