Dimensional analysis
A runner competed in a 5-mile run. How many yards did she run?
8800 yds
Joshua uses his thermometer and finds the boiling point of ethyl alcohol to be 75o C. He looks in a reference book and finds that the actual boiling point of ethyl alcohol is 80oC. What is his percent error?
6.25%
0.07882
7.882 × 10^-2
Indicate how many significant figures there are in each of the following measured values. 42
2
77.2k to C
-195.8C
After a nice meal, perhaps you’d finish it off with a pound cake for dessert. What would the name of this cake be in grams?
453.6 g
The density of water at 4oC is known to be 1.00 g/mL. Kayla experimentally found the density of water to be 1.075 g/mL. What is her percent error?
7.5%
0.00000272338
2.72338 × 10^-6
Indicate how many significant figures there are in each of the following measured values. 10.0
3
56F to k
286.3k
If you go to school for 180 days each year and each day is 7 hours long, how many hours are spent in school in one year?
1260 hrs /1 (school) year
The Handbook of Chemistry and Physics lists the density of a certain liquid to be 0.7988 g/mL. Taylor experimentally finds this liquid to have a density of 0.7925 g/mL. The teacher allows up to +/- 0.500% error to make an “A” on the lab. Did Fred make an “A”? Prove your answer.
0.79%
118000
V1.18 × 10^5
Calculate the answers to the appropriate number of significant figures. 23.7 x 3.8
90.0
what is the volume of an object with a density of 8.9g/cm^3 and mass of 3.1g (d=m/v)
0.35cm^3
In the US milk is sold by the gallon, while in Italy it is sold by the liter. How many liters of milk would you need to equal one gallon?
3.77 L
. An object has a mass of 35.0 grams. On Anthony’s balance, it weighs 34.85 grams. What is the percent error of his balance?
0.43%
87200
8.72 × 10^4
Calculate the answers to the appropriate number of significant figures. 43.678 x 64.1
2.80 x 10^3
what is the density of an object with a mass of 7.6g and volume of 20mL(d=m/v)
0.39g/mL
In the Tour de France, cyclists ride 3,653.6 km over 20 days. How many miles do they go? [Hint: watch for unimportant information!]
2269.3 mi
Working in the laboratory, a student finds the density of a piece of pure aluminum to be 2.850 g/cm3 . The accepted value for the density of aluminum is 2.699 g/cm3 . What is the student's percent error?
5.59%
0.00002786
2.786 × 10^-5
Calculate the answers to the appropriate number of significant figures. 4278 / 1.006
4252
what is the mass of an object with a density 10.5g/cm^3 and volume of 6.48cm^3 (d=m/v)
68.0g