Who have longman interactive science 1b answer

Interactive Science 1B
Workbook Solutions
Chapter 5 THE WONDERFUL SOLVENT － WATER

Part ASectional Exercise
5.1
Concept checking p.23
1. False 2. True 3. False 4. False 5. True
Multiple choicep.23
1. B 2. B3. C4. C
Questionsp.24
1. (a) (i) A is a filter paper.(ii) B is a filter funnel.
(iii) P is called the residue.(iv) Q is called the filtrate.
(b) (i) filtration(ii) Insoluble impurities
(iii) Soluble impurities and micro-organisms
2. (a) Distillation
(b) water in  water out; water out  water in

(c) (i) Condenser(ii) Thermometer
(d) Water changes into steam
(e) To cool down / To condense steam into water.
(f) Distilled water
5.2
Concept checkingp.26
1. False 2. True 3. True 4. True 5. False
Multiple choicep.26
1. B2. C3. A4. A5. C
Questionsp.27
1.(a)Ozone can be used to sterilise water.
(b)Ozone is used to sterilize water in swimming pools.
2.Chlorination used in water treatment plants.
Using ozone in swimming pools.
Using ultraviolet light in drinking water fountains.
(Or any three reasonable answers.)
3.(a)To remove large solid substances.
(b)To remove heavy and insoluble solid substances.
(c)To remove small and insoluble solid substances.
(d)To sterilise the water by killing micro-organisms
(e)To helps us prevent tooth decay
5.3
Multiple choicep.29
1. A2. B3. D4. C5. A
Fill in the blanksp.30
(a)i) evaporate, ii) water vapour, iii) evaporation
(b)i) water vapour, ii) condensed, iii) cold, iv) condensation
(c)clouds
(d)i) rain, ii) water cycle
Questionsp.30
1. (a)The water vapour in the air condensed to tiny water droplets on the cold surface of the spectacles.
(b)The water evaporated into the air.
2.(a)Towel B. It has a larger exposed surface area.
(b)Sunny (high temperature), windy and low humidity.