Which Piece Of Glassware Was The Most Accurate? Why Might That Be True?
Pre-Lab Questions
1. What are the two main types of error? What effect can they have on results?
The two types of errors are systematic error and random error. They can cause inaccuracy and uncertainty in values respectively.
2. How is uncertainty in a measurement different from or similar to how you have used the word uncertainty in other contexts?
Deviation from standard value or the mean value (average mass of the cup minus mass of cup) ©2014,CarolinaBiologicalSupplyCompany
2
MEASUREMENT AND UNCERTAINTY
Laboratory Questions
Activity 1
1. An average plastic cup from Manufacturer X weighs 10.01±.06 g. Describe a method you could use to determine the mass of an average cup from the manufacturer.
The best way is to weigh the cup …show more content…
Which piece of glassware was the most accurate? Why might that be true?
25ml Erlenmeyer flask, this may have been contributed by the shape of the glass and also the way it is calibrated. ©2014,CarolinaBiologicalSupplyCompany
3
MEASUREMENT AND UNCERTAINTY
General Lab Questions
1. Consider an experiment to determine the average rate of reaction of an antacid in water. Students drop the antacid in the water and use a stopwatch to measure the time for the antacid to stop bubbling in the water. One student drops the antacid and another student watches and carefully starts the watch
a. Identify two possible sources of systematic error:
Students, coordination and reading between the two students may lead to systemic error.
Stopwatch, operating the stopwatch and its errors may also be a cause of systemic errors.
b. Identify two possible sources of random error: Students and Stopwatch
2. Human Error is often cited by students as a source of error. What type of error is most likely affecting results if human error is cited and why?
Systematic because the students may be having poor handling skills.
3. Why is it generally good practice to always use the most accurate and precise measurement instrument
1. What are the two main types of error? What effect can they have on results?
The two types of errors are systematic error and random error. They can cause inaccuracy and uncertainty in values respectively.
2. How is uncertainty in a measurement different from or similar to how you have used the word uncertainty in other contexts?
Deviation from standard value or the mean value (average mass of the cup minus mass of cup) ©2014,CarolinaBiologicalSupplyCompany
2
MEASUREMENT AND UNCERTAINTY
Laboratory Questions
Activity 1
1. An average plastic cup from Manufacturer X weighs 10.01±.06 g. Describe a method you could use to determine the mass of an average cup from the manufacturer.
The best way is to weigh the cup …show more content…
Which piece of glassware was the most accurate? Why might that be true?
25ml Erlenmeyer flask, this may have been contributed by the shape of the glass and also the way it is calibrated. ©2014,CarolinaBiologicalSupplyCompany
3
MEASUREMENT AND UNCERTAINTY
General Lab Questions
1. Consider an experiment to determine the average rate of reaction of an antacid in water. Students drop the antacid in the water and use a stopwatch to measure the time for the antacid to stop bubbling in the water. One student drops the antacid and another student watches and carefully starts the watch
a. Identify two possible sources of systematic error:
Students, coordination and reading between the two students may lead to systemic error.
Stopwatch, operating the stopwatch and its errors may also be a cause of systemic errors.
b. Identify two possible sources of random error: Students and Stopwatch
2. Human Error is often cited by students as a source of error. What type of error is most likely affecting results if human error is cited and why?
Systematic because the students may be having poor handling skills.
3. Why is it generally good practice to always use the most accurate and precise measurement instrument