Back to AI Flashcard MakerChemistry /Basic Laboratory Techniques

Basic Laboratory Techniques

Chemistry12 CardsCreated 3 months ago

The last digit in any measured number is an estimated digit, determined by estimating one digit beyond the smallest marked unit on the measuring instrument.

Calculate the area of a rectangle in cm2 with a width of 8.6 cm and height of 4.7 cm. Be sure to include the proper number of significant figures.

Area= length x width
Area= 8.6 x 4.7
Area= 40.42
Area with correct sf= 40. (2 sf)

Tap or swipe ↕ to flip
Swipe ←→Navigate
1/12

Key Terms

Term
Definition

Calculate the area of a rectangle in cm2 with a width of 8.6 cm and height of 4.7 cm. Be sure to include the proper number of significant figures.

Area= length x width
Area= 8.6 x 4.7
Area= 40.42
Area with correct sf= 40. (2 sf)

How do you determine the last digit in any measured number?

Estimate one digit past the smallest precisely known digit or marking.

What is the correct way to report the length of the rectangle in centimeters? (image on next slide)

because the ruler goes to the tenths place (2.0), we would estimate one digit past (2.00). In this case, it is 15.6 on the ruler, but the ANSWER 15...

Calculate the volume, in cubic centimeters, of a box which is 125 cm long, 37 cm wide, and 68 cm high. Report your answer with correct significant figures in cubic centimeters.

volume of a box = l x w x h
Volume= 125 x 37 x 68
Volume= 310000 (contains correct 2 sf)

Calculate the volume of a box, in cubic centimeters, which is 423 cm long, 12 cm wide, and 25 cm high. Report your answer with correct significant figures in cubic centimeters.

volume of a box = l x w x h
Volume= 423 x 12 x 25
Volume= 130000 (contains correct 2 sf)

Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a table.
Mass of weigh boat- 1.284 g
Mass of weigh boat and sample 7.613 g

What is the mass of the solid sample (in g)?

7.613-1.284 = 6.329 grams

Related Flashcard Decks

Study Tips

  • Press F to enter focus mode for distraction-free studying
  • Review cards regularly to improve retention
  • Try to recall the answer before flipping the card
  • Share this deck with friends to study together
TermDefinition

Calculate the area of a rectangle in cm2 with a width of 8.6 cm and height of 4.7 cm. Be sure to include the proper number of significant figures.

Area= length x width
Area= 8.6 x 4.7
Area= 40.42
Area with correct sf= 40. (2 sf)

How do you determine the last digit in any measured number?

Estimate one digit past the smallest precisely known digit or marking.

What is the correct way to report the length of the rectangle in centimeters? (image on next slide)

because the ruler goes to the tenths place (2.0), we would estimate one digit past (2.00). In this case, it is 15.6 on the ruler, but the ANSWER 15.60.

Calculate the volume, in cubic centimeters, of a box which is 125 cm long, 37 cm wide, and 68 cm high. Report your answer with correct significant figures in cubic centimeters.

volume of a box = l x w x h
Volume= 125 x 37 x 68
Volume= 310000 (contains correct 2 sf)

Calculate the volume of a box, in cubic centimeters, which is 423 cm long, 12 cm wide, and 25 cm high. Report your answer with correct significant figures in cubic centimeters.

volume of a box = l x w x h
Volume= 423 x 12 x 25
Volume= 130000 (contains correct 2 sf)

Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a table.
Mass of weigh boat- 1.284 g
Mass of weigh boat and sample 7.613 g

What is the mass of the solid sample (in g)?

7.613-1.284 = 6.329 grams

When using the Tare function on a balance, start by ___________________.
Then, _______________________________ to cancel out that mass.
Finally, _____________________ and record the mass of your sample.

placing glassware on the balance
press tare/zero
add sample to the glassware

Identify which balance was used to make this mass recording : 1.230 g

A balance with ±0.001 g tolerance

Identify which balance was used to make this mass recording: 4.0000g

A balance with ±0.0001 g tolerance

Identify which balance was used to make this mass recording: 5.43 g

A balance with ±0.01 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?

d = m/v
mass = 14.74g
v = 15.46 - 10.00 = 5.46
d = 14.74 / 5.46
d= 2.70 g/mL

A 24.5 g sample of solution has a density of 0.768 g/mL. What is the sample volume (in mL)?

v = mass/density
v= 24.5 / 0.768
v = 31.9 ( 3 sf in answer)