7/26/2019 2006 09 12 Test on Chapters 1 2 3 Tutorial (for Students)

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Chapter 1 Measurements

1.1 SI Units1.2 Chemical Concentrations

1.3 Preparing Solutions1-4

Chapter 2 Tools of the Trade

2.1 Safe !thical "andling of Chemicals and #aste2.2 The $a% &ote%oo'2.3 (nal)tical *alance2-42-+ ,olumetric las's

2. Pipets and S)ringes2-/ iltration2-02- Cali%ration of ,olumetric lassare

Chapter 3 !perimental !rror

"arris th edition "arris /th edition3.1 Significant igures Significant igures

3.2 Significant igures in (rithmetic Significant igures in (rithmetic3.3 Significant igures and raphs T)pes of !rror 3.4 T)pes of !rror Propagation of Uncertaint)

from random error3.+ Propagation of Uncertaint) Propagation of Uncertaint)

s)stematic error

"arris th edition

1.36 "o man) grams of +6 t 7 &a8" 9M 46.66: should %e diluteto 1.66 $ to ma'e 6.16 M &a8"; 9(nser ith 2 digits:

"arris /th edition

1.31 1-31 "o man) grams of +6 t 7 &a8" 9M 46.66: should %ediluted to 1.66 $ to ma'e 6.16 M &a8"; 9(nser ith 2 digits

7/26/2019 2006 09 12 Test on Chapters 1 2 3 Tutorial (for Students)

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Test on Chapters 1 2 and Chapter 3

Examples

Choose the ONE best answer from among the five responses in each question.

1. A buret(a) is used to measure the volume of liquid contained in it.(b) meniscus is read with the ee positioned above or below the liquid level.(c) reading should alwas be estimated to the nearest division.(d) cannot deliver less than one drop at a time.(e) sometimes forms a bubble of air directl beneath the stopcoc! which must be e"pelled.

#. Operation of the electronic balance is based on the principle$(a) standard masses are used to measure the mass of the material placed on the balance pan.(b) removable weights are detached until the balance pan is restored to its original position.(c) an electromagnetic restoring force is used to return the pan to its original position.(d) the tare reading is reset to %ero.(e) weighing b difference.

&. 'o"ic gas used in a fume hood should be treated before disposal(a) b bubbling it through a chemical trap to prevent its escape from the hood.(b) sometimes b passing it through a burner that converts them to harmless fumes.(c) with sodium metasilicate solution to precipitate it.(d) all of the above.

(a) (a) and (b) onl.

. ring(a) of a reagent in a desiccator requires less than &* minutes.(b) a desiccant b ignition brings the glassware to about 11*oC.(c) an ob+ect being cooled in a desiccator prior to weighing should have the lid removed.(d) to constant mass is achieved when successive weighings agree to within *.& mg.(e) agents are e"emplified b asbestos, sodium, phosphorus and acids.

-. 'he number of significant figures in a measured quantit, *.-** absorbance units, is(a) 1. (b) #. (c) &. (d) . (e) -.

/. Errors in analtical measurements that arise from the chemical or phsical properties of the sample arecommonl referred to as interferences. 0ost commonl, interferences result in(a) sstematic errors.(b) random errors.(c) precision.(d) accurac.(e) a calibration graph.

7/26/2019 2006 09 12 Test on Chapters 1 2 3 Tutorial (for Students)

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. uppose ou thin! that the p2 of the buffer used to standardise a p2 meter is .**, when it is reall .*3.4hat !ind of error is this5(a) sstematic error.(b) random error.(c) careless error.(d) ha%ardous error.(e) fatal error.

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