Table 3. Subjects’ recognition level of the hazard symbols of some chemicals
Chemicals Answers f % Chemicals Answers f % Chemicals Answers f %
Correct 26 15.3 Correct 9 5.3 Correct 50 29.4
Wrong 128 75.3 Wrong 132 77.6 Wrong 102 60.0
Sodium hydroxide
No answer 16 9.4
Calcium
chloride
No answer 29 17.1
Acetic acid
No answer 18 10.6
Correct 48 28.2 Correct 16 9.4 Correct 66 38.8
Wrong 106 62.4 Wrong 136 80.0 Wrong 95 55.9
Ammonia
No answer 16 9.4
Naphthalene
No answer 18 10.6
Hydrochloric
acid
No answer 9 5.3
Correct 33 19.4 Correct 48 28.2 Correct 61 35.9
Wrong 86 50.6 Wrong 97 57.1 Wrong 97 57.1
Copper(II) sulfate
No answer 51 30.0
Nitric acid
No answer 25 14.7
Sulfuric acid
No answer 12 7.1
Correct 15 8.8 Correct 53 31.2 Correct 108 63.5
Wrong 93 54.7 Wrong 86 50.6 Wrong 51 30.0
Silver nitrate
No answer 62 36.5
Acetone
No answer 31 18.2
Ethanol
No answer 11 6.5
Correct 20 11.8 Correct 19 11.2 Correct 122 71.8
Wrong 116 68.2 Wrong 120 70.6 Wrong 30 17.6
Hydrogen
perokside
No answer 34 20.0
Iodine
No answer 31 18.2
Sodium
chloride
No answer 18 10.6