Year 7 Acids and Alkalis

Question 1

What does the pH scale go from?

Answer 1

0-14

Question 2

What is anything with a pH below 7 classed as?

Answer 2

An acid

Question 3

What is anything with a pH above 7 classed as?

Answer 3

An alkali

Question 4

What is something with a pH of 7 called?

Answer 4

A neutral substance

Question 5

What is an indicator?

Answer 5

Something that changes colour in an acid or alkali

Question 6

Why is universal indicator so good?

Answer 6

It changes colour based on the pH of the substance

Question 7

Where are stronger acids/alkalis found on the pH chart?

Answer 7

Near the ends

Question 8

What is the basic equation for neutralisation?

Answer 8

Acid + alkali —> salt + water

Question 9

What is indigestion caused by?

Answer 9

The pH of stomach acid (HCl) lowering

Question 10

How can indigestion be cured?

Answer 10

Using an antacid, which is an alkali that raises the pH of the stomach acid

Question 11

Give an example of an indicator other than universal indicator

Answer 11

Litmus paper

Question 12

What is the element found in all acids?

Answer 12

Hydrogen