phc 03 section assessment and answers ADP.ppt
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1、Prentice Hall Chemistry 2005,Section Assessment Answers Chapter 3,Init c. 2010 by Abraham Paz, with subsequent modifications and additions by Daniel R. Barnes,Click here to jump to a specific section assessment,3.1 section assessment,9. How do measurements relate to experimental science? Making corr
2、ect measurements is fundamental to the experimental sciences.,3.1 section assessment,10. How are accuracy and precision evaluated? Accuracy is the measured value compared to the correct values. Precision is comparing more than one measurement.,3.1 section assessment,11. Why must a given measurement
3、always be reported to the correct number of significant figures? The significant figures in a calculated answer often depend on the number of significant figures of the measurements used in the calculation.,3.1 section assessment,12. How does the precision of a calculated answer compare to the preci
4、sion of the measurements used to obtain it? A calculated answer can not be more precise than the least precise measurement used in the calculation.,3.1 section assessment,13. A technician experimentally determined the boiling point of octane to be 124.1C. The actual boiling point of octane is 125.7C
5、. Calculate the error and the percent error. error = -1.6C; percent error = 1.3%,3.1 section assessment,14. Determine the number of significant figures in each of the following. a. 11 soccer players b. 0.070020 meter c. 10,800 meters d. 5.00 cubic meters,a. unlimited b. 5 c. 3 d.3,3.1 section assess
6、ment,15. Solve the following and express each answer in scientific notation and to the correct number of significant figures. a. (5.3 x 104) + (1.3 x 104) b. (7.2 x 10-4)/(1.8 x 103) c. 104 x 10-3 x 10 7 d. (9.12 x 10-1) (4.7 x 10-2) e. (5.4 x 104) x (3.5 x 10 9),a. 6.6 x 10 4 b. 4.0 x 10 -7 c. 107
7、d. 8.65 x 10 -1 e. 1.9 x 10 14,3.2 section assessment,18. Which five SI base units are commonly used in chemistry? m, kg, K, s, mol,3.2 section assessment,19. Which metric units are commonly used to measure length, volume, mass, temperature, and energy? Length: cm, m, km; volume: L, mL, cm3; mass: k
8、g, g, mg; temperature: oC, K; energy: J, cal.,3.2 section assessment,20. Name the quantity measured by each of the seven SI base units and give the SI symbol of the unit. length (m) mass (kg) temperature (K or oC) time (s) amount of substance (mol) luminous intensity (cd) electric current (A),3.2 se
9、ction assessment,21. See the chart on the next slide . . .,milli-,10-3,0.001,m,nano-,10-9,0.000000001,n,deci-,10-1,0.1,d,centi-,10-2,0.01,c,Prefix,Abbreviated prefix,Power of Ten,Power of Ten Fraction,Expanded Fraction,Decimal Form,3.2 section assessment,22. List the following units in order from la
10、rgest to smallest: m3, mL, cL, mL, L, dL. m3 L dL cL mL mL,3.2 section assessment,23. What is the volume of a paperback book 21cm tall, 12cm wide, and 3.5cm thick? 8.8 x 102 cm3,3.2 section assessment,24. State the difference between mass and weight. Mass is the measure of the amount of matter in an
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