Lab 1 Flashcards
which piece of glassware is best at measuring the density of coke?
25mL pipet (from our results)
how is glassware described at being best?
lowest standard deviation, therefore the most precise glassware, lowest amount of random error
what is random error?
any deviation between values
when is random error observed?
when repeated experiments give slightly different results
when is systematic error observed?
when an experiment produces results that are consistently too high or too low
what is a mistake?
not following the procedure properly (will be able to tell based on noticeable outliers)
how many digits are reported for a 25mL graduated cylinder?
3.
2 are observed and 1 is estimated
what does standard deviation measure?
the precision between data
what does a high deviation mean?
less precise and has more dispersed values
what does a low standard deviation mean?
more precise and has values closer to one another
what is more dense, coke or diet coke?
coke
why were the densities of coke and diet coke different?
coke contains 39g of sugar
diet coke contains 0.2g of aspartame (instead of sugar)
how do you calculate the accuracy of the glassware?
