Chem 177 Spring 2011 exam 1 answers

Chem 177 Spring 2011 exam 1 answers - Chem 177-S11 Exam 1...

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Chem 177-S11 Exam 1 page 2 total points this page_______ Question 1: (3 pts) In the following statement, circle the underlined word that gives the right answer: Physical properties can be observed with / without changing the identity and composition of a substance. Question 2: (3 pts) Which result, obtained from averaging five different measurements, will be more reliable; in other words, will give you a value that is closer to the true value? A. an accurate value B. a precise value C only a precise and accurate value D. not enough information given Answer:__________ A _______________________ Question 3: (3 pts) Give an example of an extensive physical property: Answer: __ any one: mass, volume … _____________ Question 4: (3 pts) Give an example of an intensive physical property: Answer: __ any one: density, melting point, temperature, color, …
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Chem 177-S11 Exam 1 page 3 total points this page_______ Question 5: (10 pts) A 37.8 g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.00 mL. The solid and toluene together weigh 77.34 g. The density of toluene at the temperature of the experiment is 0.864 g/mL. What is the density of the solid? (Show all your work for full credit) ( ) 37.8 ; ( ) 77.34 ( ) 0.864 / ; ( ) 50 ( ) ( ) ( ) ( ) ( ) : : given need m sample g m total g density toluene g mL volume flask mL mass sample density of sample volume sample
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This note was uploaded on 09/09/2011 for the course CHEM 177 taught by Professor Greenbowe during the Spring '06 term at Iowa State.

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Chem 177 Spring 2011 exam 1 answers - Chem 177-S11 Exam 1...

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