Temperature and Answer Essay

1770 WordsOct 6, 20118 Pages
| 1. | | Passing an electric current through a certain substance produces oxygen and sulfur. This substance cannot be a(n) Your Answer: | element. | | | An element cannot be broken down into other elements. | | 2. | | Pick the chemical change that occurs when a lit match is held under a piece of metal. Your Answer: | match burns | | | Chemical changes, which release heat and light, occur during the combustion process. | | 3. | | Which identification is incorrect for the elements listed? Your Answer: | Zn, zirconium | | | Zn is zinc; Zr is zirconium. | | 4. | | Which of the following statements is false? Your Answer: | A theory can be proved correct if sufficient experimental data is acquired. | | |…show more content…
| | One mg/cm2 equals ______ kg/m2. Your Answer: | 10-2 | | | | | 22. | | What is the volume of a bar of metal with the dimensions 2.0 m x 20.0 dm x 20.0 cm? Your Answer: | 8.0 x 102 dm3 | | | The measurements have been converted to dm. | | 23. | | Which of the following objects is the most dense? Your Answer: | an object with a volume of 2.5 L and a mass of 12.5 kg | | Correct Answer: | an object with a volume of 3.91 x 10-24 nm3 and a mass of 7.93 x 10-14 ng | | | | The density is 0.50 g/mL. There is another choice that has a denser object. | | 24. | | Which of the following numbers is incorrectly rounded off to three significant figures? Your Answer: | 1213 rounded to 1.213 x 103 | | | This has four significant figures. | | 25. | | The distance from Earth to the Moon is approximately 240,000 miles. The Concorde SST has an airspeed of about 2.40 x 10 3 km/hr. If the Concorde could fly to the Moon, how many hours would it take, ignoring gravity? Your Answer: | 1.6 x 102 hours | | | Using two significant figures, this is 6.7 days. | | 26. | | How many dozens of particles of dust are in 2.45 grams if each dust particle has a mass of 2.51 x 10-4 grams? Your Answer: | 813 dozen | | | There are about 9760 dust particles. | | 27. | | Zinc has a density of 446 lb/ft3. What is the density of zinc in g/cm3? Your Answer: | 7.14 g/cm3 | | | 1 lb = 453.6 g and 1 ft = 30.48 cm or 1

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