S2 Chemistry - Acids and Alkalis

If universal indicator turned green in a substance, the substance is

• acidic

• alkaline

• neutral

if universal indicator turned purple in a solution, the substance is

• acidic

• alkaline

• neutral

if universal indicator turns red in a solution, the solution is

• neutral

• acidic

• alkaline

Which is correct for an acid?

• pH less than 7

• pH greater than 7

• pH of 7

Which is correct for an alkali?

• pH less than 7

• pH greater than 7

• pH of 7

Which is correct for a neutral substance?

• pH less than 7

• pH greater than 7

• pH of 7

Lemon juice and vinegar are examples of

• acids

• alkalis

• neutral substances

bleach and washing powder are examples of

• acids

• alkalis

• neutral substances

What is the process of water being added to either an acid or an alkali?

(a)  

What happens to the pH value of an acid when water is added to it?

• it increase towards 7

• it decreases towards 7

• it stays the same