C125 Final Lab-Simple
If you accidentally spilled some dilute HNO3 on the ground, what should you do? -
Answer- Use excessive NaHCO3 to neutralize it and then clean it.
Random errors may affect the... - Answer- precision but not the accuracy.
Phenolphthalein is the pH indicator used in Vinegar Analysis lab. Which one of the
following solutions may turn pink if a few drops of phenolphthalein is added? - Answer-
10 mL of a 0.20M HCL solution combined with 15 mL of 0.20M NaOH solution
A balance always reads 0.1g higher. If this balance is used in Gas Law lab to determine
the molar mass of butane, how will this systematic error affect the result? - Answer-
Since the mass difference is used, this systematic error will be canceled in the
subtraction. As a result, it should not affect the experimental result.
When copper wire is immersed into a silver nitrate solution, the original colorless
solution becomes light blue. What substance or ion is causing this blue color? - Answer-
Cu2+ ion
What will increase the purity of compound in crystallization? - Answer- Settle it down in
the drawer and let the solution cool down slowly so that large crystals are formed
slowly.
What might increase as a result from increasing concentration in a solution? - Answer-
absorbance
How should the % purity be reported with the correct number of significant figures? -
Answer- 92 +/- 3%
In a hydrogen atom, which principle quantum number is for the ground state of
electron? - Answer- n=1
Which statistical value is used to measure how well your results fit a linear relationship?
- Answer- R^2
In Beer Lambert Law, A=ebc. b stands for... - Answer- path length
Which one of the following is the most energetic transition in a hydrogen atom? -
Answer- n=1 to n=5
The degree to which the experimental result is to the established literature value is
called... - Answer- accuracy
What represents the precision of a set of measurements? - Answer- standard deviation
If you accidentally spilled some dilute HNO3 on the ground, what should you do? -
Answer- Use excessive NaHCO3 to neutralize it and then clean it.
Random errors may affect the... - Answer- precision but not the accuracy.
Phenolphthalein is the pH indicator used in Vinegar Analysis lab. Which one of the
following solutions may turn pink if a few drops of phenolphthalein is added? - Answer-
10 mL of a 0.20M HCL solution combined with 15 mL of 0.20M NaOH solution
A balance always reads 0.1g higher. If this balance is used in Gas Law lab to determine
the molar mass of butane, how will this systematic error affect the result? - Answer-
Since the mass difference is used, this systematic error will be canceled in the
subtraction. As a result, it should not affect the experimental result.
When copper wire is immersed into a silver nitrate solution, the original colorless
solution becomes light blue. What substance or ion is causing this blue color? - Answer-
Cu2+ ion
What will increase the purity of compound in crystallization? - Answer- Settle it down in
the drawer and let the solution cool down slowly so that large crystals are formed
slowly.
What might increase as a result from increasing concentration in a solution? - Answer-
absorbance
How should the % purity be reported with the correct number of significant figures? -
Answer- 92 +/- 3%
In a hydrogen atom, which principle quantum number is for the ground state of
electron? - Answer- n=1
Which statistical value is used to measure how well your results fit a linear relationship?
- Answer- R^2
In Beer Lambert Law, A=ebc. b stands for... - Answer- path length
Which one of the following is the most energetic transition in a hydrogen atom? -
Answer- n=1 to n=5
The degree to which the experimental result is to the established literature value is
called... - Answer- accuracy
What represents the precision of a set of measurements? - Answer- standard deviation
