1. what is the difference between recording 8.1g and 8.100g? whichis better? Ass

Question

1. what is the difference between recording 8.1g and 8.100g? whichis better? Assume a top loading balance was used. 2. Why is it better toweigh a powdered solid by difference than to weigh directly on thebalance pan and move the sample to the finalcontainer? 3. What is the range ofthe following measurements, using the appropriate uncertaintiesfrom Appendix A: a. 42.780g with a toploading balance b. 11.42mL with a25.00mL burette c. 370mL with a 500mLgraduated cylinder d. 250mL with avolumetric flask e. 10.00mL with apipette 2. Why is it better toweigh a powdered solid by difference than to weigh directly on thebalance pan and move the sample to the finalcontainer? 3. What is the range ofthe following measurements, using the appropriate uncertaintiesfrom Appendix A: a. 42.780g with a toploading balance b. 11.42mL with a25.00mL burette c. 370mL with a 500mLgraduated cylinder d. 250mL with avolumetric flask e. 10.00mL with apipette

Explanation / Answer

1. It is better to record 8.100g because with the zeroes, itis more specific. With just 8.1g you don't know what the nextdigits are, for all you know it could be 8.123423 and it was justrounded to the tenth. 2. If you put a powdered solid on a balance then move it to afinal container, it is very hard to get every bit of the powder offthe balancing pan. 3. Can't really do this problem without appendix A.

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