true or false review
TRANSCRIPT
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True or False Review
Common Acids and Alkalis
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1. Strong acids can react with other substances to
produce more acid.
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2. Only acids are corrosive.
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3. Cobalt chloride paper can be used to test for
acids and alkalis.
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4. A hairstylist uses an acid to soften the hair so that it can take the shape
of the hair curlers.
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5. The acids found in foods and drinks are
weak acids. Weak acids are quite safe to take in.
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6. Only strong alkalis are used as household cleansing liquids.
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7. Red litmus paper is used to test for acids
and blue litmus paper is used to test for alkalis.
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8. Litmus paper is also called pH paper.
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9. Toothpaste contains an acid which kills
bacteria in the mouth.
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10. We use a blue litmus paper to test whether a
solution is alkaline or not.
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11. Universal indicator is a mixture of dyes.
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12. Corrosive hazard warning labels should be put on the bottles of some household
cleansers, e.g. oven cleanser and toilet cleanser.
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13. Indicators are dyes which change colour
when placed in an acid or an alkali.
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14. Acids can be found in milk products like cheese and yogurt.
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15. The degree of acidity or alkalinity can be expressed
by its pH value. Acids have a pH value less than 7 while
alkalis have a pH value greater than 7.
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16. The degree of acidity and alkalinity can be expressed by its pH.
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17. Acids have a pH value less than 7 while alkalis have a pH value
greater than 7.
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18. Alkalis are not corrosive.
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19. Acids can be added to food and drinks to improve the tastes.
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20. Litmus paper can be used to indicate
whether a solution is acidic or alkaline.
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21. Litmus paper can be used to indicate how
strong or how weak an acid or an alkali is.
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22. All acids have a sour taste.
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23. All alkalis feel soapy and have a bitter taste.
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24. The soft drink “Cream Soda” contains
caustic soda.
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25. pH paper turns orange or red when
placed in acidic solution.
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26. pH paper turns yellow or green when
placed in neutral or nearly neutral solutions.
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27. pH paper turns purple or brown when placed in a neutral or
nearly neutral solutions.
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28. The digestive juice in our stomach is a weak
acid so it does not harm us.
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29. Apples are acidic.
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30. Alkalinity increases when pH increases.
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31. All metals react with dilute acids to give off
hydrogen.
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32. Hydrogen burns in air to produce a “pop”
sound.
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33. All metals react with alkalis to form carbon
dioxide.
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34. An aluminum pot is suitable to contain
tomato soup.
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35. Acids can corrode marbles surfaces.
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36. Acid rain buildings made of marbles,
limestone and cement.
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37. If you get acids on your skin, you should
neutralise them by adding suitable amount of alkalis.
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38. For safety reason, household cleansers are
always sold in diluted solution.
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39. If we want to dilute a concentrated alkali,
we should add water to it carefully.
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40. When diluting a strong acid, the best way to do this is to add water
to the strong acid and stir.
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41. Reactions involving strong acids and strong alkalis usually give out a
lot of heat.
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42. When there is an accident involving acids and alkalis, we must neutralise the acid or the
alkalis with chemicals immediately.
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43. When diluting a strong alkali, we should wear protective gloves
and eyeglasses.
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44. The pH of natural rainwater is around 7.
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45. Acid rain speeds up the release of metals from minerals in soil. These metals are important for
plant growth.
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46. Acid rain damages the leaves of trees, affecting the process of photosynthesis.
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47. In order to improve air quality, the Government will replace all
diesel vehicles by liquefied petroleum gas vehicles.
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48. The tap water in Hong Kong is always
neutral.
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49. The pH value of acid rain can be as low as 3.
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50. Sulphur dioxide affects the growth of fish
in rivers.
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51. Acid rain is caused by acidic gases such as
nitrogen dioxide and sulphur dioxide in the air.
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52. Rainwater is neutral.
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53. Acid rain is diluted in lakes and rivers, so it does not harm fish in fish ponds
and lakes.
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54. Fish in lakes die when the water is so acidic that
the pH is above 6.
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55. One of the main causes of acid rain is emission of nitrogen oxides from vehicles.
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56. The process of adding water to an acidic or
alkaline solution is called neutralisation.
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57. The only product formed after
neutralisation is water.
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58. Adding Sodium Chloride to hydrochloric
acid is an example of neutralization.
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59. We can detect the product of neutralization
by tasting it.
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60. Hydrochloric acid can be used to preserve food
because it kills germs.
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61. All cleansing agents contain both acids and
alkalis.
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62. Antacids contain a strong alkali which
neutralises the strong acid produced by the stomach.
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63. All insect bites contain alkali.
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64. Toothpastes contain a weak alkali which
neutralises the acid produced by the bacteria.
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65. The chemical waste from school laboratories
will be collected by licensed collectors for disposal.
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66. The industrial wastes containing acids and alkalis,
if discharged without treatment into the sea or
streams, will cause corrosion of metal pipes and ships.
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67. Concentrated hydrochloric acid can
dissolve glass and therefore it must be stored in lead,
steel or plastic containers.
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68. Acids/Alkalis can act as preservatives.
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69. Lime can be added to soil to reduce the
acidity.
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70. When an alkali is neutralised by an acid, salt
and water are formed.
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71. When some water is added to an acid, the
amount of alkali needed to neutralise it increases.
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72. Pickling is a method used to preserve food.
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73. Sodium chloride is a strong alkali.
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74. Strong alkalis can break down fat and are used to remove grease.
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75. Antacids contain a weak alkali that can neutralise the strong acid produced by the
stomach.
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76. Acids and alkalis are chemical opposites.
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77. Oven cleaners are strongly acidic so they can corrode the stains on the
oven away.
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78. Ethanoic acid is used to preserve food because
acids can kill bacteria.
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79. “Pickling” means adding salt to preserve
food.
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80. An apple turns brown after it is cut open. It is because the iron in the
apple rusts.
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81. When you eat too much, your stomach will
produce more acid.
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True or False Answers
Common Acids and Alkalis
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1. Strong acids can react with other substances to
produce more acid.
True
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2. Only acids are corrosive.
False
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3. Cobalt chloride paper can be used to test for
acids and alkalis.
False
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4. A hair stylist uses an acid to soften the hair so that it can take the shape
of the hair curlers.
False
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5. The acids found in foods and drinks are
weak acids. Weak acids are quite safe to take in.
False
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6. Only strong alkalis are used as household cleansing liquids.
False
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7. Red litmus paper is used to test for acids and blue litmus
paper is used to test for alkalis.
False
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8. Litmus paper is also called pH paper.
False
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9. Toothpaste contains an acid which kills
bacteria in the mouth.
False
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10. We use a blue litmus paper to test whether a
solution is alkaline or not.False
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11. Universal indicator is a mixture of dyes.
True
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12. Corrosive hazard warning labels should be put on the bottles of some household cleansers, e.g. oven cleanser and toilet cleanser.
True
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13. Indicators are dyes which change colour when placed in
an acid or an alkali.
True
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14. Acids can be found in milk products like cheese and
yogurt.
True
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15. The degree of acidity or alkalinity can be expressed by its pH value. Acids have a pH value less than 7 while alkalis
have a pH value greater than 7.
True
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16. The degree of acidity and alkalinity can be expressed by its pH.
True
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17. Acids have a pH value less than 7 while alkalis have
a pH value greater than 7.
True
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18. Alkalis are not corrosive.
False
![Page 102: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/102.jpg)
19. Acids can be added to food and drinks to improve the tastes.
True
![Page 103: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/103.jpg)
20. Litmus paper can be used to indicate whether a
solution is acidic or alkaline.
True
![Page 104: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/104.jpg)
21. Litmus paper can be used to indicate how strong or how
weak an acid or an alkali is.
True
![Page 105: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/105.jpg)
22. All acids have a sour taste.
True
![Page 106: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/106.jpg)
23. All alkalis feel soapy and have a bitter taste.
True
![Page 107: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/107.jpg)
24. The soft drink “Cream Soda” contains caustic
soda.
False
![Page 108: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/108.jpg)
25. pH paper turns orange or red when placed in
acidic solutions.
True
![Page 109: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/109.jpg)
26. pH paper turns yellow or green when placed in neutral or nearly neutral
solutions.
True
![Page 110: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/110.jpg)
27. pH paper turns purple or brown when placed in a neutral or nearly neutral
solutions.
False
![Page 111: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/111.jpg)
28. The digestive juice in our stomach is a weak acid so it
does not harm us.
False
![Page 112: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/112.jpg)
29. Apples are acidic.
True
![Page 113: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/113.jpg)
30. Alkalinity increases when pH increases.
True
![Page 114: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/114.jpg)
31. All metals react with dilute acids to give off
hydrogen.
False
![Page 115: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/115.jpg)
32. Hydrogen burns in air to produce a “pop”
sound.
True
![Page 116: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/116.jpg)
33. All metals react with alkalis to form carbon
dioxide.
False
![Page 117: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/117.jpg)
34. An aluminum pot is suitable to contain tomato
soup.
True
![Page 118: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/118.jpg)
35. Acids can corrode marbles surfaces.
True
![Page 119: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/119.jpg)
36. Acid rain attacks buildings made of marbles,
limestone and cement.
True
![Page 120: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/120.jpg)
37. If you get acids on your skin, you should neutralise
them by adding suitable amount of alkalis.
False
![Page 121: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/121.jpg)
38. For safety reason, household cleansers are
always sold in diluted solution.
False
![Page 122: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/122.jpg)
39. If we want to dilute a concentrated alkali, we should add water to it
carefully.
False
![Page 123: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/123.jpg)
40. When diluting a strong acid, the best way to do this is to add water to the strong acid
and stir.
False
![Page 124: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/124.jpg)
41. Reactions involving strong acids and strong alkalis
usually give out a lot of heat.
True
![Page 125: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/125.jpg)
42. When there is an accident involving acids and alkalis, we must
neutralise the acid or the alkalis with chemicals immediately.
False
![Page 126: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/126.jpg)
43. When diluting a strong alkali, we should wear protective gloves and
eyeglasses.
True
![Page 127: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/127.jpg)
44. The pH of natural rainwater is around 7.
False
![Page 128: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/128.jpg)
45. Acid rain speeds up the release of metals from minerals in soil. These metals are
important for plant growth.
False
![Page 129: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/129.jpg)
46. Acid rain damages the leaves of trees, affecting the process of photosynthesis.
True
![Page 130: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/130.jpg)
47. In order to improve air quality, the Government will replace all diesel vehicles
by liquefied petroleum gas vehicles.
False
![Page 131: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/131.jpg)
48. The tap water in Hong Kong is always neutral.
False
![Page 132: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/132.jpg)
49. The pH value of acid rain can be as low as 3.
True
![Page 133: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/133.jpg)
50. Sulphur dioxide affects the growth of fish in rivers.
True
![Page 134: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/134.jpg)
51. Acid rain is caused by acidic gases such as nitrogen dioxide and sulphur dioxide in the air.
True
![Page 135: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/135.jpg)
52. Rainwater is neutral.
False
![Page 136: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/136.jpg)
53. Acid rain is diluted in lakes and rivers, so it does not harm
fish in fish ponds and lakes.
False
![Page 137: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/137.jpg)
54. Fish in lakes die when the water is so acidic that the pH is
above 6.
False
![Page 138: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/138.jpg)
55. One of the main causes of acid rain is emission of
nitrogen oxides from vehicles.
True
![Page 139: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/139.jpg)
56. The process of adding water to an acidic or alkaline solution is
called neutralisation.
False
![Page 140: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/140.jpg)
57. The only product formed after neutralisation is water.
False
![Page 141: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/141.jpg)
58. Adding Sodium Chloride to hydrochloric acid is an
example of neutralization.
False
![Page 142: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/142.jpg)
59. We can detect the product of neutralization by tasting it.
False
![Page 143: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/143.jpg)
60. Hydrochloric acid can be used to preserve food because
it kills germs.
False
![Page 144: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/144.jpg)
61. All cleansing agents contain both acids and
alkalis.
False
![Page 145: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/145.jpg)
62. Antacids contain a strong alkali which neutralises the strong acid produced by the
stomach.
False
![Page 146: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/146.jpg)
63. All insect bites contain alkali.
False
![Page 147: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/147.jpg)
64. Toothpastes contain a weak alkali which neutralises the
acid produced by the bacteria.
True
![Page 148: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/148.jpg)
65. The chemical waste from school laboratories will be
collected by licensed collectors for disposal.
True
![Page 149: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/149.jpg)
66. The industrial wastes containing acids and alkalis, if discharged without treatment
into the sea or streams, will cause corrosion of metal pipes
and ships.
True
![Page 150: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/150.jpg)
67. Concentrated hydrochloric acid can dissolve glass and
therefore it must be stored in lead, steel or plastic containers.
False
![Page 151: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/151.jpg)
68. Acids/Alkalis can act as preservatives.
True
![Page 152: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/152.jpg)
69. Lime can be added to soil to reduce the acidity.
True
![Page 153: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/153.jpg)
70. When an alkali is neutralised by an acid, salt
and water are formed.True
![Page 154: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/154.jpg)
71. When some water is added to an acid, the amount of alkali
needed to neutralise it increases.
False
![Page 155: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/155.jpg)
72. Pickling is a method used to preserve food.
True
![Page 156: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/156.jpg)
73. Sodium chloride is a strong alkali.
False
![Page 157: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/157.jpg)
74. Strong alkalis can break down fat and are used to remove grease.
True
![Page 158: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/158.jpg)
75. Antacids contain a weak alkali that can neutralise the strong
acid produced by the stomach.
True
![Page 159: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/159.jpg)
76. Acids and alkalis are chemical opposites.
True
![Page 160: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/160.jpg)
77. Oven cleaners are strongly acidic so they can corrode the
stains on the oven away.
False
![Page 161: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/161.jpg)
78. Ethanoic acid is used to preserve food because acids can kill bacteria.
True
![Page 162: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/162.jpg)
79. “Pickling” means adding salt to preserve
food.
False
![Page 163: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/163.jpg)
80. An apple turns brown after it is cut open. It is because the
iron in the apple rusts.
False
![Page 164: True or false review](https://reader034.vdocument.in/reader034/viewer/2022052601/5589d011d8b42a3d578b462c/html5/thumbnails/164.jpg)
81. When you eat too much, your stomach will
produce more acid.
True