CHM 1045 Fall 06 Test 1 Week 3 - version 2 -Answers

# CHM 1045 Fall 06 Test 1 Week 3 - version 2 -Answers -...

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Unformatted text preview: Name…………………………………… Recitation #......... CHM 1045 Fall 06 Test 1 Week 3 45minutes 1 What are the SI units (name and abbreviation) for:- Name Abbreviation Time second s Amount of substance mole mol Length meter m 6 2 Decide whether these changes are physical or chemical. a Milk going sour ……………….. chemical b Milk freezing ……………….. physical c milk being used in Cleopatra’s bath ………… physical 3 3 How many dm 3 are equal to 35278cm 3 ? Give your answer in scientific notation to three significant figures. 1dm 3 = 1000cm 3 so 35278cm 3 = 35278/1000dm 3 = 35.278dm 3 = 3.53 x 10 1 dm 3 to 3sf. 3 4 The density of copper is 7.9 x 10 3 kg/m 3 , what is this density converted to g/cm 3 . (You may like first to convert to g/m 3 and then to g/ cm 3 .) 1kg = 1000g and so 7.9 x 10 3 kg/m 3 = 7.9 x 10 6 g/m 3 . 1m 3 = (100cm) 3 = 1 x 10 6 cm 3 and so 7.9 x 10 6 g/m 3 = 7.9g/cm 3 2 5 A bottle of sherry has a mass, when full, of 926.1g and, when empty, of 213.6g.A bottle of sherry has a mass, when full, of 926....
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CHM 1045 Fall 06 Test 1 Week 3 - version 2 -Answers -...

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