C4.3

Question 1

1. What can molten compounds of metals with non-metals do?

Answer 1

-conduct electricity

Question 2

1. What is a molten compound of metals with non-metals being able to conduct electricity evidence for?

Answer 2

-that they are made up of charged particles called ions

Question 3

2. What is an ion?

Answer 3

An ion is an atom (or group of atoms) that has gained or lost electrons and so has an overall charge
-they gain or lose electrons to try and gain a full outer shell

Question 4

3. What are the charges for Group 1 and Group 7 elements?

Answer 4

Group 1- Lose one electron: +1 (positive)

Group 7- Gain one electron: -1 (negative)

Question 5

6. What are compounds of Group 1 metals with Group 7 elements?

Answer 5

-ionic

Question 6

7. Why do solid ionic compounds form crystals?

Answer 6

Because the ions are arranged in a regular lattice

Question 7

7. What is an example of a solid ionic compound?

Answer 7

Sodium chloride (NaCl)

Question 8

8. What happens to the ions when an ionic crystal melts or dissolves in water?

Answer 8

The charged ions are free to move

Question 9

9. Why can ionic compounds conduct electricity when molten or when dissolved in water?

Answer 9

Because the ions are charged and they are able to move around independently in the liquid