Acids Bases and Oxides

Front

What is produced when an acid reacts with a metal?

Back

When an acid reacts with a metal, it produces a salt and hydrogen gas.

Front

What is an alkali?

Back

An alkali is a water-soluble base.

Front

What colour does litmus paper turn in acidic conditions?

Back

In acidic conditions, litmus paper turns red.

Front

True or False?

Thymolphthalein turns blue in alkaline conditions.

Back

True.

Thymolphthalein turns blue in alkaline conditions.

Front

Why is litmus not suitable for titrations?

Back

Litmus is not suitable for titrations because its color change is not sharp and it goes through a purple transition color in neutral solutions.

Front

What is an indicator?

Back

An indicator is a substance that changes colour in acidic or alkaline conditions, used to determine the pH of a solution.

Front

Define the term neutralisation.

Back

A neutralisation reaction is a reaction between an acid and a base to form a salt and water.

Front

True or False?

Effervescence is produced when an acid reacts with a metal oxide or hydroxide.

Back

False.

Effervescence is produced when an acid reacts with a metal carbonate, due to the formation of carbon dioxide gas.

Front

Name the products formed from the reaction between sodium hydroxide and hydrochloric acid.

Back

The products formed from the reaction between sodium hydroxide and hydrochloric acid are sodium chloride and water.

Front

What is the general equation for the reaction of a metal carbonate with an acid?

Back

The general equation for the reaction of a metal carbonate with an acid is:

metal carbonate + acid ⟶ salt + carbon dioxide + water