Dimensional Analysis and Metric Conversions
Measurement
Sig Figs/Scientific Notation
SI Units
Mole Conversions
Lab Equipment and Evaluating Measurements
100
How many feet are in 37.5 inches?
3.13 feet
100
When should you end a measurement?
When you write down everything you know and estimate one more digit.
100
How many sig figs in a measurement of 10.050 seconds?
5
100
SI unit for mass
kilogram
100
How many molecules are in 0.0914 moles of water?
5.5 x 1022 molecules of water
100
The lab equipment you would use to measure volume.
Graduated cylinder
200
How many meters are in a kilometer?
1000
200
How many mL of liquid are in the graduated cylinder?
6.60mL
200
Write 0.00240 sec in scientific notation.
2.40 x 10-3 sec
200
SI unit for temperature
Kelvin
200
How many atoms of carbon in one mole
6.02 x 1023
200
Draw a target showing the following scenarios:
- Both accurate and precise
- Accurate but not precise
(See drawings)
300
What is the number of centimeters in 19.82 km?
1982000 cm (1.982 x 106 cm)
300
What is the length of the wood in mm?
45.8mm to 46.0mm
300
A student uses the conversion factor of 1 minute = 60 seconds. How many significant figures should they use for this conversion factor?
Unlimited
300
SI unit for density.
kg/m3
300
How many grams are in 2.5 moles of fluorine?
48 grams
300
Percent error is an indication of the _________ of a measurement.
Accuracy
400
What is the number of hours in 12345 seconds?
3.4292 hours
400
Which ruler would give you more precision in your measurement and how do you know?
Ruler B - There would be a smaller difference in the measurements because you could measure to an additional decimal place.
400
A student measures a mysterious block and finds it has a mass of 16.84g and a volume of .56cm3. What is the density of the block?
3.0 x 101g/cm3
400
What does volume measure?
amount of space that something takes up
400
How many atoms are in 72.8g of silicon?
1.56 x 1024 atoms
400
Which of the following measurements is the most precise AND how do you know?
1.2m, 1.22m, 1.204x10-3m, 0.00002m
1.204x10-3m, It has the highest number of sig figs.
500
What is the number of millimeters in 2.5 yds? (1 in = 2.54 cm)
2300 mm
500
A student does a lab and calculates that his experiment has produced 3.82g of lithium. It was supposed to produce 1 mole. What is his percent error with the amount of atoms?
45.0% error
500
A block has a length of 0.25 cm, a width of 1.56 cm and a height of 1.10 cm. The mass is 3.745 g. Determine the density of the block.
8.7 g/cm3
500
What is the difference between mass & weight?
Mass = amount of material in a substance
Weight = pull of gravity on that substance.
500
A piece of magnesium takes up 0.560cm3 and has a density of 1.739g/cm3. How many atoms are in the sample?
2.41 x 1022 atoms
500
The % error of your measurement if you measured a volume of 59.6 mL and found out the accepted value was 65.0 mL.
8.31%