1. Put the following steps in order to describe an experiment that follows the scientific method. -From First to Last-
Test revised hypothesis, testing discredits the initial hypothesis, testing confirms the revised hypothesis, the revised hypothesis becomes a theory, make initial observation, test initial hypothesis, form initial hypothesis, revise hypothesis.
Test revised hypothesis, testing discredits the initial hypothesis, testing confirms the revised hypothesis, the revised hypothesis becomes a theory, make initial observation, test initial hypothesis, form initial hypothesis, revise hypothesis.
3. You need to determine the diameter of a piece of copper wire in mm. The wire is 46.73 cm long and weighs 1.663 g. The density of copper is 8.933 g/cm3.
What is the diameter of the wire? In mm
What is the radius of the wire? In mm
What is the diameter of the wire? In mm
What is the radius of the wire? In mm
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5. Classify the following properties as intensive or extensive
Temperature, color, mass, hardness, volume, length, boiling point, density
Temperature, color, mass, hardness, volume, length, boiling point, density
8. Perform the following calculation. Report the answer using the proper number of significant figures.
9. A 76.00-pound flask of mercury costs $163.00. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values.
What is the price of one pound of mercury?
What is the price of one gram of mercury?
What is the price of one cubic centimeter of mercury?
What is the price of one cubic inch of mercury?
b) It takes 4.500 cubic inches of mercury to make one manometer. Find the price of the mercury used to make 17 manometers by first calculating the cost of mercury for one manometer.
What is the price of mercury used to make one manometer?
What is the price of mercury used to make 17 manometers?
What is the price of one pound of mercury?
What is the price of one gram of mercury?
What is the price of one cubic centimeter of mercury?
What is the price of one cubic inch of mercury?
b) It takes 4.500 cubic inches of mercury to make one manometer. Find the price of the mercury used to make 17 manometers by first calculating the cost of mercury for one manometer.
What is the price of mercury used to make one manometer?
What is the price of mercury used to make 17 manometers?
10. How many grams of salt are needed to make 727 g of saltwater that is 35.5% salt by mass? In g salt
11. Convert 4.02 µm to inches.
12. Convert 83.8 m3 to liters. Note that 1 mL = 1 cm3
14. A sample of metal has a mass of 21.99 g, and a volume of 4.93 mL. What is the density of this metal? g/cm3
15. An empty beaker weighs 40.67 g.
a) When completely filled with water, the beaker and its contents have a total mass of 364.15 g. What volume does the beaker hold? Use d =1.00 g/mL as the density of water. In mL
b) How much would the beaker and its contents weigh if it was completely filled with mercury? The density of mercury is d =13.5 g/mL. in g
17. Label the zeros in these numbers as either significant, or not significant. 20 20.0
19. Round each number to three significant figures: 0.036549, 1044.987, 4.0007
20. Round each number to two significant figures. 233.356, 0.002353, 1.005
24. If a bullet travels at 417.0 m/s, what is its speed in miles per hour? Mi/h
25. A certain hybrid car has a mileage rating of 47 miles per gallon. If the car makes a trip of 283 miles, how many gallons of gasoline will be used?
26. In a certain city, electricity costs $0.17 per kW•h. What is the annual cost for electricity to power a lamp-post for 6.00 hours per day with (a) a 100.-watt incandescent light bulb (b) an energy efficient 25-watt fluorescent bulb that produces the same amount of light? Assume 1 year = 365 days.
(a) 100.-watt bulb
(b) 25-watt bulb
(c) A typical incandescent bulb costs $0.89 and lasts for about a year; a typical energy efficient fluorescent bulb costs about $3.49 and lasts for about 3 years. Is the additional cost of the fluorescent bulb justified? Yes No
27. An office heater puts out 2050 Btus (British thermal units) of energy in the form of heat per hour. Given that 1 Btu = 1.055 kJ, how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater (assume continuous operation)? Mj/ Jear
28. A carpet sells for $25.99 a square yard. What is the price of the carpet per square meter? In m2
28. How much will it cost to carpet an area 1461 square feet?
29. A particular MP3 encoder can convert 81.0 kilobytes (kb) of music per second from a typical music CD. How many minutes will it take to convert 13.5 megabytes (Mb) of music from a CD?
30. If your front lawn is 25.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1350 new snow flakes every minute, how much snow (in kilograms) accumulates on your lawn per hour? Assume an average snow flake has a mass of 2.10 mg. In kg/h
11. Convert 4.02 µm to inches.
12. Convert 83.8 m3 to liters. Note that 1 mL = 1 cm3
14. A sample of metal has a mass of 21.99 g, and a volume of 4.93 mL. What is the density of this metal? g/cm3
15. An empty beaker weighs 40.67 g.
a) When completely filled with water, the beaker and its contents have a total mass of 364.15 g. What volume does the beaker hold? Use d =1.00 g/mL as the density of water. In mL
b) How much would the beaker and its contents weigh if it was completely filled with mercury? The density of mercury is d =13.5 g/mL. in g
17. Label the zeros in these numbers as either significant, or not significant. 20 20.0
19. Round each number to three significant figures: 0.036549, 1044.987, 4.0007
20. Round each number to two significant figures. 233.356, 0.002353, 1.005
24. If a bullet travels at 417.0 m/s, what is its speed in miles per hour? Mi/h
25. A certain hybrid car has a mileage rating of 47 miles per gallon. If the car makes a trip of 283 miles, how many gallons of gasoline will be used?
26. In a certain city, electricity costs $0.17 per kW•h. What is the annual cost for electricity to power a lamp-post for 6.00 hours per day with (a) a 100.-watt incandescent light bulb (b) an energy efficient 25-watt fluorescent bulb that produces the same amount of light? Assume 1 year = 365 days.
(a) 100.-watt bulb
(b) 25-watt bulb
(c) A typical incandescent bulb costs $0.89 and lasts for about a year; a typical energy efficient fluorescent bulb costs about $3.49 and lasts for about 3 years. Is the additional cost of the fluorescent bulb justified? Yes No
27. An office heater puts out 2050 Btus (British thermal units) of energy in the form of heat per hour. Given that 1 Btu = 1.055 kJ, how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater (assume continuous operation)? Mj/ Jear
28. A carpet sells for $25.99 a square yard. What is the price of the carpet per square meter? In m2
28. How much will it cost to carpet an area 1461 square feet?
29. A particular MP3 encoder can convert 81.0 kilobytes (kb) of music per second from a typical music CD. How many minutes will it take to convert 13.5 megabytes (Mb) of music from a CD?
30. If your front lawn is 25.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1350 new snow flakes every minute, how much snow (in kilograms) accumulates on your lawn per hour? Assume an average snow flake has a mass of 2.10 mg. In kg/h
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