Y10 _Topic 5 _ Acids, Bases and pH

Which characteristics describe an acid?

• tastes sour, litmus indicator turns red

• tastes bitter, litmus indicator turns blue

• tastes sweet and sour, litmus indicator turns red

• tastes sour and bitter, litmus indicator turns blue

Which characteristics describe a base?

• tastes sour, litmus indicator turns blue

• tastes bitter, litmus indicator turns blue

• tastes bitter sour, litmus indicator turns blue green

• tastes bitter sour, litmus indicator turns green

Which of the following is an acid?

• soap

• baking soda

• orange juice

• water

Which of the following is a base?

• carbonated water

• lime juice

• vinegar

• dishwashing detergent

What property do all three of these fruits have in common?

• taste bitter sweet

• cannot conduct electricity

• have pH below 7

• turn litmus paper blue

What property do all three of these household items have in common?

• sometimes conduct electricity

• taste soapy

• have a pH equal to or above 7

• turn litmus paper blue

What is present in aqueous solutions of an acid or alkali that allow them to conduct electricity?

• mobile electrons

• mobile ions

• mobile atoms

• mobile molecules

When Sally tested an unknown solution, her red litmus paper turned blue, but her blue litmus paper remained blue. What does this indicate?

• unknown is acidic

• unknown is alkaline

• unknown is neutral

• unknown can be acidic, alkaline or neutral

Which statement is correct?

• Blue litmus paper turns red in alkaline solution.

• Red litmus paper turns blue in acidic solution.

• Blue litmus paper remains blue in acidic or neutral solution.

• Red litmus paper remains red in acidic or neutral solution.

The pH scale is a range from

• 1 to 7

• 0 to 14

• 1 to 14

• 1 to 20