1) Name sample fixation a) physical and chemical b) cooling c) grab sample 2) What may lead to faulty results while sampling? a) improper sampling and fixation b) stability of a sample c) following the procedurere 3) What is the most common material used for taking samples? a) plastic b) borosilicate c) glass 4) Labeling the container a) time, place b) owner's name, date, time c) owner's name, date, time, place 5) Do you always have to rinse the bottle? a) yes b) no c) Whatever! 6) What is the proper way of storing the water sample? a) In a cold portable refrigerator b) in a cold, dark place c) in a dark place 7) What stands for TOC? a) Total Organic Carbon b) Total Dissolved Solids c) Total aerobic microbial count 8) What two popular acids are added to fixate the sample a) ascorbic acid and acetic acid b) sulphuric acid or hydrogen nitrate c) hydrochloric acid and sulphuric acid 9) It is best to store a sample at ....... degree Celsius a) 0-5 b) 1-5 c) 2-5 10) The calibration curve allows the determination of ........ of the test sample a) concentration b) absorbance 11) The spectrophotometer measures..... a) the concentration of a sample b) the absorbance of a sample 12) How many standard solutions do you have to prepare to obtain a calibration curve? a) min.2 standard solutions b) one is enough c) min.3 13) How many standard solutions do you have to prepare to obtain a calibration curve in a common laboratory practice? a) min.2 b) from 3 to 10 c) min.5 14) In calibration curve, what indicates the X- axis and Y-axis? a) X - absorbance Y concetration b) X concetration Y absorbance 15) What two processes are involved in distillation? a) cooling and purification b) selective boiling and condensation c) bonding and boiling 16) Which of these is NOT a distillation a) Simple b) Fractional c) Precipitation d) Under reduced pressure e) vacuum 17) Recall the properties of toluene? a) non-aromatic hydrocarbon b) aromatic hydrocarbon 18) Which one  presents simple distillation? a) b) c) 19) Which picture presents a spherical flask? a) b) c) 20) Separatory funnel a) b) c) 21) Test tube a) b) c) 22) Cuvette a) b) c) 23) Indicate the industrial sampling a) b) c) 24) Which picture presents taking a lake sample? a) b) c) 25) Which picture shows H-pictograms? a) b) c)

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