Chem Separation and Purification Test

© 2013 Marshall Cavendish International (Singapore) Private Limited 1 Name:______________________________( ) Class:_________ Date:___________ TEST Chapter 3: Separation and Purification Multiple-Choice Questions (10 marks) 1. Which of the following is a pure substance and not a mixture? A Common salt B Milk C Petrol D Soap ( ) 2. Distillation involves _____________. A condensation, then evaporation B evaporation, then condensation C filtration, then evaporation D filtration, then condensation ( ) 3. Doctors need to detect the presence of amino acids in the urine when diagnosing illnesses. Which of the following experimental techniques is suitable for detecting amino acids in urine? A Chromatography B Crystallisation C Distillation D Filtration ( ) 4. Pure solids _____________. A are colourless in appearance B are crystalline in appearance C melt at an exact temperature D dissolve completely in water ( ) 5. Solder is a mixture of two metals, lead and tin. These two metals can be separated by distillation as they have different _____________. A boiling points B densities C reactivities D solubilities ( ) 25

2 © 2013 Marshall Cavendish International (Singapore) Private Limited 6. From which mixture can the underlined substance be obtained by adding water, stirring and then filtering? A Alcohol and vinegar B Chalk and sugar C Iron and steel D Salt and sand ( ) 7. The diagram shows a chromatogram prepared using spots of five different inks. How many different dyes were used to make the five inks? A 3 B 4 C 5 D 12 ( ) 8. Which of the following substances may be condensed using a water-cooled condenser? Melting point/°C Boiling point/°C A –76 –32 B –115 –85 C –130 36 D –143 –80 ( ) solvent flow x x x x x starting line

© 2013 Marshall Cavendish International (Singapore) Private Limited 3 9. The table gives information about the solubility of three solids. Solid Solubility in water Solubility in alcohol L insoluble soluble M insoluble insoluble N soluble insoluble The following shows the possible steps in obtaining a pure substance: 1. Add water. 2. Add alcohol. 3. Filter. 4. Evaporate filtrate to dryness. Which of the following shows the correct order of steps to obtain pure L from a mixture of L, M and N? A 1, 3, 4 B 2, 1, 3, 4 C 2, 3, 4 D 1, 2, 3, 4 ( ) 10. The filter tip of a cigarette acts as both a condenser and a filter. Which of the following substances cannot be removed by the filter tip? Substance Boiling point/°C A nicotine 248 B tar between 350–400 C carbon monoxide 192 D water 100 ( )

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