CHEM 219 LAB EXAMS 1 TO 4 COMBINED
SOLVED QUESTIONS COMPLETE PREPARATION
◉ Top-Loading Balances.
Answer: Easier to use and can weigh larger objects
(topless bitches are large)
◉ Analytical Balance.
Answer: More precise
◉ What is uncertainty?.
Answer: The last digit in a measurement
◉ Random error.
Answer: Equal and arbitrary chance that the last digit is too high or
too low
◉ Systematic Error.
Answer: Error skewed in one direction that is attributed to
experimental design, poorly calibrated measurements, or user error
,◉ What error can be eliminated?.
Answer: Systematic error
◉ Accuracy.
Answer: CLOSE to target
◉ Precision.
Answer: Closeness of objects... may not be near target
◉ % error calculation.
Answer: |average value - true| / true value *100%
◉ % standard deviation equation.
Answer: standard deviation / average value * 100%
◉ What is the absolute error in 4.69 +- 0.04?.
Answer: 0.04
◉ What is the relative error in 4.8 +- 0.5?.
Answer: 0.5/4.8
◉ What should we do with excess solutions?.
, Answer: DO NOT pour back into the stock bottle. Perhaps share with
another student or dispose in the waste container
◉ What are the three nutrients lacking in soil?.
Answer: Nitrogen, Phosphorus, and Potassium
◉ What does 15-30-15 represent?.
Answer: 15% N, 30% P2O5, 15% K2O
◉ Gravimetric Analysis.
Answer: Method of analysis based on MASS measurements
◉ WTF is oxidation reduction????.
Answer: LMK
◉ What is a net ionic equation?.
Answer: Using only the relevant products and reactants
◉ Calorimeter.
Answer: The device used to measure the heat associated with a
chemical or physical change
SOLVED QUESTIONS COMPLETE PREPARATION
◉ Top-Loading Balances.
Answer: Easier to use and can weigh larger objects
(topless bitches are large)
◉ Analytical Balance.
Answer: More precise
◉ What is uncertainty?.
Answer: The last digit in a measurement
◉ Random error.
Answer: Equal and arbitrary chance that the last digit is too high or
too low
◉ Systematic Error.
Answer: Error skewed in one direction that is attributed to
experimental design, poorly calibrated measurements, or user error
,◉ What error can be eliminated?.
Answer: Systematic error
◉ Accuracy.
Answer: CLOSE to target
◉ Precision.
Answer: Closeness of objects... may not be near target
◉ % error calculation.
Answer: |average value - true| / true value *100%
◉ % standard deviation equation.
Answer: standard deviation / average value * 100%
◉ What is the absolute error in 4.69 +- 0.04?.
Answer: 0.04
◉ What is the relative error in 4.8 +- 0.5?.
Answer: 0.5/4.8
◉ What should we do with excess solutions?.
, Answer: DO NOT pour back into the stock bottle. Perhaps share with
another student or dispose in the waste container
◉ What are the three nutrients lacking in soil?.
Answer: Nitrogen, Phosphorus, and Potassium
◉ What does 15-30-15 represent?.
Answer: 15% N, 30% P2O5, 15% K2O
◉ Gravimetric Analysis.
Answer: Method of analysis based on MASS measurements
◉ WTF is oxidation reduction????.
Answer: LMK
◉ What is a net ionic equation?.
Answer: Using only the relevant products and reactants
◉ Calorimeter.
Answer: The device used to measure the heat associated with a
chemical or physical change
