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CHEM 121 LAB FINAL EXAM QUESTIONS WITH ALL POSSIBLE SOLUTIONS ANSWERED 2024/2025
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CHEM 121 LAB FINAL EXAM QUESTIONS WITH ALL POSSIBLE SOLUTIONS ANSWERED 2024/2025 When using the Tare function on a balance, start by (1). Then (2) to cancel out that mass. Finally, (3) and record the mass of your sample. 1) Placing the glassware on the balance 2) Press the Tare/Zero button 3)...

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  • June 22, 2024
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  • 2023/2024
  • Exam (elaborations)
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CHEM 121 LAB FINAL EXAM QUESTIONS WITH ALL

POSSIBLE SOLUTIONS ANSWERED 2024/2025


When using the Tare function on a balance, start by (1). Then (2) to cancel out

that mass. Finally, (3) and record the mass of your sample.

1) Placing the glassware on the balance

2) Press the Tare/Zero button

3) Add your sample to the glassware

5.43 g

A balance with ±0.01 g tolerance

1.230 g

A balance with ±0.001 g tolerance

4.0000 g

A balance with ±0.0001 g tolerance

A graduated cylinder contains 10.00 mL water. A 14.74 g piece of aluminum is

added to the water, and the volume rises to 15.46 mL. What is the density of the

aluminum in g/mL?

density = mass/volume

d = 14.74g / 5.46mL = 2.70 mL

A 24.5 g sample of solution has a density of 0.768 g/mL. What is the sample

volume (in mL)?

, 31.9 mL

v = mass/density

v = 31.9 mL

In order to use a pipet, place a (1) at the top of the pipet. Use this object to fill the

pipet such that the (2) of the liquid is even with the volume line. Release the

liquid, touching the tip of the pipet to the side of the container if necessary to

release the last drop (3) the pipet tip.

1) Bulb or pump

2) Meniscus

3) Outside

Identify effective techniques for accurate pipet use.

1) Do not let liquid enter the pipet bulb or pump.

2) Measure liquid by aligning the meniscus with the volume line.

Accuracy

The closeness between a measurement and its accepted value.

Precision

The closeness among a set of measurements.

A series of measurements in the lab led to an experimental result of 32.9 mL, with

a calculated standard deviation of 0.3 mL. What is the standard way to report this

result?

32.9 ± 0.3 mL

A cube of plastic 1.3 × 10−5 km on a side has a mass of 2.1 g. What is its density

in g/cm3?

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