Basic Scientific Measurements Using Laboratory Tools Flashcards
Which tool is best suited to measure the length of a bedroom?
Tape measure.
A chemist needs to add 5 µL of a reagent to a reaction solution. Which of the following is the best tool to accomplish this?
A micropipette.
Which would be the approximate mass of a car?
1,800 kg
Which of the following would an electron microscope be used to measure?
20-nm polymer films.
Correctly order the following prefixes from smallest to largest: milli, kilo, deci, micro, nano.
nano, micro, milli, deci, kilo
Which of the following is true about SI Units?
SI Units are the standard measurement system in science.
A chemist was performing a spectroscopy experiment on a fluorescent dye to examine the influence of concentration on absorbance. To accomplish this, the chemist created a stock solution of a certain concentration of dye using 10 mL of water (H2O). Then, a serial dilution was performed by taking 1 mL of the stock solution and diluting it with 9 mL of water for a total solution volume of 10 mL. 1 mL was taken from Solution 2 and diluted with 9 mL water to create Solution 3. The serial dilution was performed through Solution 5, as shown in the diagram below. If the dye concentration in Solution 5 was 0.5 g/mL, what was the concentration of the dye in Solution 2?
500 g/mL
When going to the grocery store, you need to purchase some vegetables, which are sold by weight. Which of the following units would the weight of the vegetables be expressed in?
Kilograms.
Which of the following is not an SI base unit?
Liter.
Which of the following units is derived from SI base units?
Kilometer.
In an experiment, a reaction requires 0.006 kg of KCl, but the scale used to measure the mass only reports masses in grams (g). Which of the following values would the scale read if the exact mass of KCl was measured?
6g
Which of the following prefixes would likely be the most appropriate for measuring the weight of a 2,500 g kitten?
Kilo.
Which of the following would be the best choice to measure 0.0015 grams of a chemical reagent?
Analytical balance.
A book weighs 2.2 kg. How much does it weigh in grams?
2,200g
Which of the following is the correct formula to measure volume?
Volume = length x width x height
