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CHEMISTRY 300 Sacramento City College Chapter 2 Chapter 2 Homework Please complete all questions on a separate piece of paper. For questions that require calculations show ALL steps and box all of the answers for full credit. Questions 1) Define the different types of zeros found in a number and explain whether or not they are significant. 2) Give the two conversion factors you can construct using each pair of units. c) meters and kilometers b) liters and microliters a) seconds and milliseconds 3) In general, how can you identify whether or not you have written the correct conversion factor for the problem? 4) Construct a conversion factor that can convert from one unit to the other in each pair of units. a) meter to km b) inch to cm c) pounds to kilogram Scientific Notation 5) Convert each number into scientific notation a. 736,350 b. 0.0042 c. 2500 d. 0.478 6) Convert each number into decimal notation a. 7.42 x 103 b. 1.3 x 10-3 c. 1.5 x 106 d. 1.5147 x 10-5 7) Fill in the blank Scientific Notation a) 4.7 x103 b) c) 9.3 x 10-4 d) Decimal Notation 7,410. 0.0045 CHEMISTRY 300 Sacramento City College Chapter 2 Significant Figures 8) Use each diagram to report a measurement to the proper number of significant figures. a) b) c) d) CHEMISTRY 300 Sacramento City College Chapter 2 9) a) b) c) CHEMISTRY 300 Sacramento City College Chapter 2 d) 10) Give the number of significant figures in each. Identify the rule for each. a) 0.000140500 s b) 630,001 kg c) 155.000 in d) 0.0745 m 11) How many significant figures are in each number? a) b) c) d) 1.05 9,500 0.0004505 7563 12) How many significant figures are in each number? a. 0.052010 b. 0.3940 c. 8200 d. 8563 Rounding 13) Round each number to three significant figures. a. 24.632 b. 0.34244 c. 43,539 d. 6.9978 x 106 CHEMISTRY 300 Sacramento City College Chapter 2 14) Determine if each number is rounded correctly to three significant figures. For the one that is incorrect, correct them a. 3.459 x 103 to 3.5 x 103 b. 4.874 x 103 to 50 c. 87.42 to 87.4 d. 0.09853 to 0.010 15) Complete the table Number a. 53.53229 b.216.3535 c. 0.36682 d. 0.00888881 Rounded to 4 Significant Figures 53.53 Rounded to 2 Significant Figures 54 Rounded to 1 Significant Figures 5 x 101 Significant Figures in Calculations 16) Determine if each calculation has the correct number of significant figures. For the one that is incorrect, correct them a) 105.34 x 47.334532 = 4986.22 b) 0.047 x 23.3544 = 1.098 c) 5.5225 / 503.455 = 0.010969 d) 0.000154*1002.2 = 0.15 17) Determine if each calculation has the correct number of significant figures. For the one that is incorrect, correct them a) 5.8 + 63.09 – 14 = 54.9 b) 4301 – 2900.14 + 1.6 = 1402 c) 0.00354 + 0.86 = 0.863 d) 0.00974 – 0.008 = 0.00074 18) Determine if each calculation has the correct number of significant figures. For the one that is incorrect, correct them a) 3.5 + 94.04 – 50 = 47.5 b) 8206 – 5614.25 + 5.5 = 2597.25 c) 0.00354 + 0.864 = 0.868 d) 0.01874 – 0.010 = 0.00874 CHEMISTRY 300 Sacramento City College Chapter 2 19) Determine if each calculation has the correct number of significant figures. For the one that is incorrect, correct them a. (9.95 + 3.09) / 7.40000 = 1.762 b. (1045.3 – 1.4) x 1.604 = 1674 c. (749.40 + 6.7) / 4.54 = 1.6 x 102 d. (845 / 301457) + 5.000198 = 5.00 Unit Conversion 20) Convert the following metric quantities into the indicated units. Identify the number of significant figures in each answer. a. 1000. g into milligram b. 6981 nm into meter c. 15 mL into liter d) 345 cm to millimeters 21) Use English-to-Metric and Metric-to-English conversion factors to calculate the following: a) 87.6 ft into centimeter b) 557 yd to meters c) 645 feet to centimeter d) 7.0 inch to cm 22) Use English-to-Metric and Metric-to-English conversion factors to calculate the following: a) 90.7 ft into millimeter b) 14.8 lbs to kg c) 400. m to mi d) 12.0 inch to cm 23) Fill in the blank to complete the table m 6.02 x10-5 s km mm 6.02 x 10-2 mm nm pm 25.3 pm 225 nm 8.22 x 10-3 km 4.2 x 105 mm CHEMISTRY 300 Sacramento City College Chapter 2 Unit Raised to a Power 24) Perform each conversion a) 1.2 ft2 = _____in2 b) 1.2 yd2 = _______ft2 c) 1.2 m3 = _______ yd3 25) Perform each conversion a) 3.5 ft2 = _____in2 b) 3.5 yd2 = _______ft2 c) 35 m3 = _______ yd3 26) A pizza has an area of 3.44 m2. Perform a conversion to each of the following units. a) in2 b) mm2 c) km2 Density 27) A copper strip has a mass of 4.67 gram and volume of 0.523 cm3. What is the density of the copper strip? Is the strip pure copper? 28) A silver ingot has a mass of 70.34 gram and volume of 8.5 cm3. What is the density of the ingot? Is the ingot pure silver? 29) Given the density of Gold is 19.3 g/cm3 a) Determine the mass of gold (in grams) in an ingot with the volume of 121 cm3 b) Determine the volume of gold (in cm3) in an ingot with the mass of 1354 gram 30) Given the density of Cu is 8.93 g/cm3 a) Determine the mass of copper (in gram) in a copper strip with the volume of 433.0 cm3. b) Determine the volume of copper (in cm3) in a copper strip with the mass of 502.34 gram. 31) Given the density of lead is 11.34 g/cm3 a) Determine the mass of lead (in gram) in a lead block with the volume of 607.9 cm3. b) Determine the volume of lead (in cm3) in a lead block with the mass of 802.35 gram. Cumulative Problems 32) If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3 ft = 1 yd) 33) If an object has a density of 8.65 g/cm3, what is its density in units of kg/m3? CHEMISTRY 300 Sacramento City College Chapter 2 34) Water is being pumped out of a reservoir at a rate of 2.54 liters per 15.0 seconds. If the reservoir contains 1.0500 x 106 gallons of water, how many hours will it take to empty it? 35) The mass of an average blueberry is 0.75 g and the mass of an automobile is 2.0103 kg. Find the number of automobiles whose total mass is the same as 1.0 x 1010 blueberries? 36) Tom and Mary both have farms. Tom raises chicken for eggs while Mary plants apple. Tree pounds of apple can be exchanged with 1 dozen of eggs. If Tom has 130. eggs to exchange with Mary, how many pounds of apple will he get? 37) Calculate the number of seconds in 1.00 year.
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CHEMISTRY 300
Sacramento City College
Chapter 2
Chapter 2 Homework
Please complete all questions on a separate piece of paper. For questions that require
calculations show ALL steps and box all of the answers for full credit.
Questions
1) Define the different types of zeros found in a number and explain whether or not they are
significant.
a) Any digit that is non-zero is significant.
b) When a zero is in between two significant digits they become significant.
c) When a zero appears at the end of a digit or in the decimal portion they
become significant.
2) Give the two conversion factors you can construct using each pair of units.
c) meters and kilometers = 1 kilometer = 1000 meters or 1 x 10-3 kilometer = 1
meter
b) liters and microliters = 1 liter = 1000000 microliter or 1 x 10-6 liter = 1 microliter
a) seconds and milliseconds = 1 second = 1000 millisecond or 1 x 10-3 seconds = 1
millisecond
3) In general, how can you identify whether or not you have written the correct conversion
factor for the problem? The factors that convert each unit need to be equal, that is,
the multiplying or dividing factors of conversion.
4) Construct a conversion factor that can convert from one unit to the other in each pair of
units.
a) meter to km = 1 meter = 1 x 10-3 km or 1 km = 1000 meter
b) inch to cm = 1 inch = 2.54 cm or 0.394 inch = 1 cm
c) pounds to kilogram = 1 pound = 0.454 kilogram or 2.205 pounds = 1 kilogram
Scientific Notation
5) Convert each number into scientific notation
a. 736,350 = 736,350/100,000 = 7.3635 x 105
b. 0.0042 = 4.2 x 10-3
c. 2500 = 2.5 x 103
d. 0.478 = 4.78 x 10-1
6) Convert each number into decimal notation
a. 7.42 x 103 = 7420
b. 1.3 x 10-3 = 0.0013
c. 1.5 x 106 = 1500000
d. 1.5147 x 10-5 = 0.000015147

7) Fill in the blank
Scientific Notation
a) 4.7 x103
b)
7...


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I was struggling with this subject, and this helped me a ton!

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