Chapter 6.1 Introduction to electrolysis

Question 1

Why can ionic compounds be broken only when they are molten or dissolved in water?

Answer 1

This is because their ions are then free to move and carry their charge to the electrodes.

Question 2

Where do the positive ions and negative ions move to in electrolysis?

Answer 2

• The positive ions move to the cathode (negative electrode)
• The negative ions move to the anode (the positive electrode).

Question 3

Why can’t covalent bonds be electrolysed?

Answer 3

This is because covalent bonds share electrons.

Question 4

What does the word electrolysis mean?

Answer 4

‘breaking down using electricity’

Question 5

What happens during electrolysis?

Answer 5

Positively charged ions move to the cathode (negative electrode). At the same time, the negative ions move to the anode (positive electrode), as opposite charges attract.

Question 6

What do you call the substance broken down by by electrolysis?

Answer 6

The electrolyte.

Question 7

Why are ionic compounds unable to conduct electricity when they are a solid?

Answer 7

This is because when they are a solid their ions are in fixed positions in a giant lattice.