For questions 1 to 9 chose the correct word from the brackets to make each sentence correct1. The opposite of an acid is an (alcohol, litmus, indicator, alkali).2. When using acids you must always remember to wear (gloves, goggles,

protective shoes).3. Indicators change (temperature, shape, colour, acidity) in acids and alkalis.4. Blue litmus indicator paper (stays blue, goes red, goes yellow, goes white)

in an acid.5. Blue litmus indicator paper (stays blue, goes red, goes yellow, goes white)

in an alkali.6. Red litmus indicator paper (stays red, goes blue, goes yellow, goes white)

in an acid.7. Red litmus indicator paper (stays red, goes blue, goes yellow, goes white)

in an alkali.8. If a liquid is not acid or alkali we say that it is (water, indicator, neutral,

green).9. Universal indicator goes (red, green, blue, purple) in a neutral liquid.

Use the words in the box to complete the sentences in questions 10 to 16

litmus alkali lichen blue red sour green . 10. The opposite of acid is ___________.11. The name of the plant that can be used to make an indicator is __________.12. The name of an indicator used in the laboratory is _____________ .13. Weak acids taste ____________ 14. In an acid, Universal Indicator is _____________.15. In an alkali, Universal Indicator is ________________.16. In a neutral liquid, Universal Indicator is _________________.

Use the words in the box to complete the sentences in questions 17 to 19

an acidic an alkaline a neutral .

17. When you add just enough alkali to cancel out an acid, you make __ __________ solution.18. A wasp sting is an alkali so you should put __ ____________ solution on to cure it.19. Indigestion is often called 'having an acid stomach'. You should take __ _____________ substance to cure it.

For questions 20-23 choose the correct answer and write the letter A,B,C or D

20. Removing acidity by adding an alkali is called A acidification B neutralisation C distillation D evaporation 21. An example of a neutral substance is A sodium hydroxide B pure water C sulphuric acid D lemon juice

Do not write on this sheet!

22. A farmer wants to neutralise an acidic soil. Which kind of chemical

should he/she put on it? A acidic B neutral C alkaline D salty

23. We measure the strength of an acid using this scale: A Universal B pH C Richter D Indicator

Beakers A, B and C show different mixtures of an acid and an alkali. The acid and alkali are of equal concentration.

For questions 24 to 26, write down the letter of the correct mixture next to the pH number.24. The solution with a pH 3 is ____

25. The solution with a pH 11 is _____

26. The solution with a pH 7 is _____

For questions 27 to 29, copy the table and complete it by deciding whether each of these substances in the box is an acid, neutral or alkali.

vinegar toothpaste indigestion tabletswindow cleaning fluid lemon juice water

27. Acid 28. Neutral 29. Alkali

30. Too much acid in the stomach often causes indigestion. Explain carefully why stomach tablets and powders contain a weak alkali.

Well done!Now go back and check your work to make sure you haven’t made any silly

mistakes.