G6 - Acids Vocabulary quiz

Fill in the blank: An acid is a substance that has a ______ taste and a pH lower than 7.

• sour

• sweet

• bitter

• salty

An alkali is a substance that has a ______ taste, feels soapy, and has a pH above 7.

• bitter

• sweet

• sour

• salty

A neutral substance is neither ______ nor alkaline, with a pH of 7.

• acidic

• basic

• salty

• bitter

The pH scale is a scale from 0 to 14 that shows how ______ or alkaline a substance is.

• acidic

• neutral

• basic

• salty

An indicator is a substance that changes ______ to show if something is an acid or alkali.

• color

• temperature

• state

• smell

Fill in the blank: Litmus paper is a special type of paper used as an ______ to test acids and alkalis.

• indicator

• adhesive

• solvent

• catalyst

Red litmus paper turns ______ in an alkali and stays red in an acid.

• blue

• red

• green

• yellow

Fill in the blank: Blue litmus paper turns ______ in an acid and stays blue in an alkali.

• red

• green

• yellow

• purple

Fill in the blank: Neutralisation is a reaction where an acid and an alkali mix to make a ______ substance (pH 7).

• neutral

• acidic

• basic

• alkaline

Fill in the blank: Hydrochloric acid is a strong acid found in the ______ that helps with digestion.

• stomach

• liver

• pancreas

• intestine