1.E: Essential Ideas of Chemistry- Homework
For Chapter 1 you MUST know the following:
- The names and symbols for elements 1-18
- The SI Base units, the measured property, and the symbol
- The SI Prefixes, their abbreviation, and their meaning (M, k, c, m, u , n, p)
Turn in your answers for the following questions - show your work
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Perform the following unit conversions. Express your answers in scientific notation with the appropriate number of significant figures.
- Convert 78.01 inches into: feet, meters, and centimeters.
- Convert 15.42 meters into kilometers, centimeters, and millimeters.
- Convert 98.6 °F into °C and K.
- Convert 75 miles per hour into: km per hour and m s -1 .
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A large piece of jewelry has a mass of 132.6 g. A graduated cylinder initially contains 48.6 mL water. When the jewelry is submerged in the graduated cylinder, the total volume increases to 61.2 mL.
- Determine the density of this piece of jewelry.
- Assuming that the jewelry is made from only one substance, what substance is it likely to be? Explain.
- In the movie Goldfinger , James Bond foils a plot to break into Fort Knox. 007 does some quick mental calculations to determine the feasibility of removing the gold. If the price of gold is $14.00 per troy ounce (31.1035 grams) at the time the movie was produced, what is the mass (in kg) of 1 million dollars of gold? What is the volume of 1 million dollars of gold in L. How much would this gold be worth today if the price of gold is $9068.77 per kg?
- The following experiment is performed with an unknown liquid. The liquid is added to a graduated cylinder with a mass of 54.6789 grams. After 20.00 mL of the liquid is added to the cylinder (at 298 K), the mass is 74.6215 grams. Is the liquid water? How do you know? If it is not water, what could it be?
- The experiment above is repeated with a second liquid, after 21.3 mL of this liquid (at 20 °C) is added the mass of the cylinder is 72.7364 grams. Is the second liquid ethanol? How do you know? If it is not ethanol, what could it be?
The Following Questions are for your practice - Do Not Turn In. They include answers so you can check your work
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Perform the following calculations and report each answer with the correct number of significant figures.
- 628 \(\times\) 342
- (5.63 \(\times\) 10 2 ) \(\times\) (7.4 \(\times\) 10 3 )
- \(\dfrac{28.0}{13.483}\)
- 14.98 + 27,340 + 84.7593
- 42.7 + 0.259
- Answer (a)
- (2.15 \(\times\) 10 5 )
- Answer (b)
- 4.2 \(\times\) 10 6
- Answer (c)
- 2.08
- Answer (d)
- 27,440
- Answer (e)
- 43.0
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Use scientific (exponential) notation to express the following quantities in terms of the SI base units in
- 0.13 g
- 86.3 mg
- 37.6 cm
- 54 μm
- 27 ns
- Answer (a)
- 1.3 \(\times\) 10 −4 kg
- Answer (b)
- 8.63 \(\times\) 10 −5 kg
- Answer (c)
- 3.76 \(\times\) 10 −1 m
- Answer (d)
- 5.4 \(\times\) 10 −5 m
- Answer (e)
- 1 \(\times\) 10 9 s
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Make the conversion indicated in each of the following:
- the length of a soccer field, 120 m (three significant figures), to feet
- the height of Mt. Kilimanjaro, at 19,565 ft the highest mountain in Africa, to kilometers
- the area of an 8.5 t 11-inch sheet of paper in cm 2
- the estimated mass of the atmosphere, 5.6 t 10 15 tons, to kilograms
- the mass of a 5.00-grain aspirin tablet to milligrams (1 grain = 0.00229 oz)
- Answer (a)
- 394 ft
- Answer (b)
- 5.9634 km
- Answer (c)
- 6.0 \(\times\) 10 2
- Answer (d)
- 5.1 \(\times\) 10 18 kg
- Answer (e)
- 324 mg
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Calculate these masses.
- What is the mass of 6.00 cm 3 of mercury, density = 13.5939 g/cm 3 ?
- What is the mass of 25.0 mL octane, density = 0.702 g/cm 3 ?
- Answer (a)
- 81.6 g
- Answer (b)
- 17.6 g
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Calculate these volumes the volume of 25 g iodine, density = 4.93 g/cm
3
?
- Answer
- 5.1 mL
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Convert the boiling temperature of gold, 2966 °C, into degrees Fahrenheit and kelvin.
- Answer
- 5371 °F, 3239 K
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Convert the temperature of the coldest area in a freezer, −10 °F, to degrees Celsius and kelvin.
- Answer
- −23 °C, 250 K
Contributors and Attributions
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Paul Flowers (University of North Carolina - Pembroke), Klaus Theopold (University of Delaware) and Richard Langley (Stephen F. Austin State University) with contributing authors. Textbook content produced by OpenStax College is licensed under a Creative Commons Attribution License 4.0 license. Download for free at http://cnx.org/contents/85abf193-2bd...a7ac8df6@9.110 ).