Bitesize has changed! We're updating subjects as fast as we can. Visit our new site to find Bitesize guides and clips - and tell us what you think!

Did you know?

We also have Bitesize study guides covering many subjects at National 4 and National 5 on our Knowledge & Learning BETA website.

Home > Chemistry > Acids > Reactions of acids

Chemistry

Reactions of acids

Reactions of acids and metals (General/Credit)

(General)

Some metals will react with acids to neutralise them and give off hydrogen gas molecules.

The general word equation for the reaction is:

METAL +ACID → SALT + HYDROGEN

eg.

Zinc + Sulphuric acid → Zinc sulphate + Hydrogen

(Zn + H2SO4 → ZnSO4 + H2)

(Credit)

Remember that at Credit level you will be expected to balance formula equations.

Example question

Now try the typical Standard Grade question below.

Question

Change the word equation below into a formula equation.

magnesium + hydrochloric acid → magnesium chloride + hydrogen

Remember the formula for a metal is just its symbol.

Answer

Mg + HCl → MgCl2 + H2

Question

Try to balance the formula equation above.

Answer

Mg + 2HCl → MgCl2 + H2

Watch

Flasks

Class Clips

Take a look at the effect of pH on food.

Watch

PH indicator

Class Clips

Why is it important to know why certain substances are acidic, neutral, or alkaline? Watch to find out.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.