For each question, circle the correct answer. Question 1 Vinegar is an acid. Like some other acids vinegar tastes... A) salty B) sour C) sugary D) sweet Question 2 Acids may be hazardous chemicals. Concentrated hydrochloric acid is hazardous because it is... A) corrosive B) flammable C) oxidising D) toxic Question 3 The following label is found on a bottle of dilute sodium hydroxide. The label means that dilute sodium hydroxide is... A) corrosive B) explosive C) an irritant D) toxic Cambridge Essentials Science Cambridge University Press 2003, 2006, 2008 1
Question 4 Some dilute hydrochloric acid is splashed onto a pupil s hand. The hand should be washed with a large amount of water because it the acid. A) corrodes B) dilutes C) dissolves D) neutralises Question 5 Acids are everywhere. Sulfuric acid is a strong acid found in... A) car batteries B) lemons C) milk D) vinegar Question 6 The table shows the colours red cabbage juice turns in acid and alkali. Red cabbage juice is an example of... A) a base B) an indicator C) ph D) a salt colour in acid red colour in alkali green Question 7 The table shows the result when pieces of red and blue litmus paper are dipped into a solution. The solution is... A) ammonia B) hydrochloric acid C) limewater D) sodium hydroxide red litmus paper... stays red blue litmus pape turns red Cambridge Essentials Science Cambridge University Press 2003, 2006, 2008 2
Question 8 The table shows the ph of four different substances. substance lemon juice soda water stomach acid washing-up liquid ph 3 5 1 6 The most strongly acidic substance is... A) lemon juice B) soda water C) stomach acid D) washing-up liquid Question 9 The table shows the ph of four different substances. substance baking powder oven cleaner soap washing soda ph 9 12 8 10 The most weakly alkaline substance is... A) baking powder B) oven cleaner C) soap D) washing soda Question 10 A solution of table salt is neutral. The ph of this solution is... A) 3 B) 5 C) 7 D) 9 Question 11 A few drops of universal indicator are added to a strongly acidic solution. The universal indicator turns... A) green B) purple C) red D) yellow Cambridge Essentials Science Cambridge University Press 2003, 2006, 2008 3
Question 12 A few drops of universal indicator are added to a strongly alkaline solution. The universal indicator turns... A) blue B) green C) orange D) purple Question 13 A few drops of universal indicator are added to pure water. The universal indicator turns... A) blue B) green C) orange D) yellow Question 14 The table shows the colour of universal indicator in four different solutions. Solution A B C D Colour of universal indicator red orange blue purple Choose the solution A B C or D which is weakly acidic. Question 15 The table shows the colour of universal indicator in four different solutions. Solution A B C D Colour of universal indicator red orange blue purple Choose the solution A B C or D which is weakly alkaline. Cambridge Essentials Science Cambridge University Press 2003, 2006, 2008 4
Question 16 Acids and alkalis can be used to cancel each other out. The reaction between an acid and an alkali is called... A) combination B) combustion C) decomposition D) neutralisation Question 17 Dan puts 5 cm 3 of a solution of ph 14 into a test tube. He adds 10 cm 3 of a solution of ph 1. The ph in the test tube... A) becomes zero B) decreases C) increases D) stays the same Question 18 Bee stings are acidic. Toothpaste can be used to treat the bee sting because it is... A) an acid B) an alkali C) an indicator D) neutral Question 19 Antacids are indigestion remedies. Antacids are... A) acids B) alkalis C) indicators D) neutral Question 20 The soil in a farmer s field is too acidic to grow healthy plants. To neutralise the soil the farmer adds... A) fertiliser B) lime C) manure D) nutrients Cambridge Essentials Science Cambridge University Press 2003, 2006, 2008 5