Ch 23 Flashcards Preview

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Flashcards in Ch 23 Deck (19)
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1
Q

What refers to a measurement an actual value of a sample with a limited deviation?

A

Accuracy

2
Q

What is an example of an accurate measurement?

A

A sample weighing one gram plus or minus 0.001 gram

3
Q

What is the repeatability of a set of measurements on the same sample?

A

Precision

4
Q

What is an example of a precision measurement?

A

Measuring the same 1 gram sample thrice

5
Q

Test tubes are small and allow for a

A

Number of samples to be arrayed in a rack

6
Q

Round-bottom flasks are used for

A

Reaction, heating, or vacuum applications

7
Q

What is a retort

A

A round vacuum flask with a long neck that extends to the side

8
Q

Retorts are used for

A

Distillation, and are placed on a ring stand

9
Q

An extraction flask, or a separatory funnel, is a

A

Teardrop-shaped flask with a ground glass stopper at the top and stopcock at the bottom

10
Q

Bell jars contain

A

Vacuums

11
Q

Calibrated glassware is used for any measurement that requires

A

Accuracy and precision

12
Q

What is good to use for simultaneously heating and distilling a reaction mixture?

A

A round-bottom flask, for the round shape gives it extra strength to withstand heat and vacuum.

13
Q

What is the difference between a volumetric flask and pipet?

A

The flask is designed to hold an amount, but not transfer it.

14
Q

What is the appropriate glassware for titration?

A

A buret

15
Q

What is the best glassware to use if a scientist needs to test 20 samples?

A

Test tubes

16
Q

What is accurate in checking pH, Litmus or a pH meter?

A

A pH meter

17
Q

What is best for both accuracy and precision?

A

The three-point calibration test

18
Q

A scientist wants to make a solution of a 1.00 molal solution of sodium chloride in water.
What should be used to measure the water added to the solution?

A

A balance, for the solvent is measured by weight rather than volume.

Molal is moles solute / kg solvent

19
Q

What combination is most suitable for titrating and measuring pH of a solution with endpoint pH 4.4?

A

A buret (titration), beaker, and litmus paper