Metals and non-metals

What is a pH scale?

pH is a number (0 to 14) which indicates the extent of acid or base properties of a substance

What scale number(s) are very strong acids?

0 to 2

What scale number(s) are weak acids?

3 to 6

What scale number(s) are neutral?

7

What scale number(s) are weak bases?

8 to 10

What scale number(s) are very strong bases?

11 to 14

What pH value does an acid solution have?

Lower than 7

What pH value does an alkaline solution have?

Higher than 7

What are some examples of metals?

Copper aluminum and iron

How does metal oxide form?

Metal oxide is the product that forms when a metal reacts with oxygen

What is corrosion?

The process where the exposed surface of a metal reacts with oxygen to form metal oxide

What is rust?

It is iron oxide that forms due to the slow chemical reaction of iron with oxygen that combines with water

Where can rust only take place?

On the exposed surface of iron when it is in contact with water and oxygen

What is required for iron to rust?

Oxygen and water

What are some methods to prevent rust?

1. Spraying with oil

2. Painting

3. Galvanising

What are indicators?

Chemical substances that are used to determine if a substance is an acid or a base