Question
Sam,a form one student at Heru academy accidentally mixed sulphur and iron filings.
(a). Suggest an appropriate method of separation you would advice him to use to separate the mixture.
(b). Give a reason for the choice of your answer.
(c).Describe how he would use the method named in 5(a) above ton separate the sulphur and iron filings.
(d). Name two substances that sublime when heated.
(e). Give two reasons why dry ice (solid carbon (IV) oxide) is preferred to be used in cold boxes by ice cream vendors over ordinary ice.
(a). Suggest an appropriate method of separation you would advice him to use to separate the mixture.
(b). Give a reason for the choice of your answer.
(c).Describe how he would use the method named in 5(a) above ton separate the sulphur and iron filings.
(d). Name two substances that sublime when heated.
(e). Give two reasons why dry ice (solid carbon (IV) oxide) is preferred to be used in cold boxes by ice cream vendors over ordinary ice.
Answer
(a). use of a magnet.
(b). iron filings are magnetic while sulphur is not.
(c). spread the mixture on a plain cardboard. Pass the magnet through the mixture. Iron filing are attracted to the magnet and are removed while sulphur is left on the cardboard
(d).anhydrous iron (iii) chloride, aluminium chloride ,benzoic acid carbon (iv) oxide(dry ice),iodine.
(e)- it sublimes leaving no wetness
-it is a better coolant compared to ordinary ice
(b). iron filings are magnetic while sulphur is not.
(c). spread the mixture on a plain cardboard. Pass the magnet through the mixture. Iron filing are attracted to the magnet and are removed while sulphur is left on the cardboard
(d).anhydrous iron (iii) chloride, aluminium chloride ,benzoic acid carbon (iv) oxide(dry ice),iodine.
(e)- it sublimes leaving no wetness
-it is a better coolant compared to ordinary ice
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