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Homework 3

1 .       For the following measured numbers, the number of significant figures is indicated in parentheses. Which is incorrect?

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2 .       The density of liquid bromine is 3.12 g/mL. What is the mass of 0.250 L of bromine?

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3 .       7.00 yd3 = ______ m3.

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4 .       Which set of measurements on a 2.00-gram standard is the most precise?

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5 .       Which conversion to standard exponential notation is incorrect?

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6 .       Which of the indicated number of significant figures is incorrect?

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7 .       An object will sink in a liquid if the density of the object is greater than that of the liquid. If the mass of an object is 9.83 g, what volume must it have in order for it to sink in liquid mercury (density = 13.6 g/cm3)?

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8 .       One mg/cm2 equals ______ kg/m2.

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9 .       If an athlete runs a 10.00-sec 100.0-yd dash, what is his/her speed in miles per hour? (One mile is 1,760 yards.)

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10 .       For a given temperature, how do the Fahrenheit and Celsius values compare?

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11 .       What is the volume of a bar of metal with the dimensions 2.0 m x 20 dm x 20 cm?

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12 .       How many grams of alcohol with a density of 0.900 g/cm3 will have the same volume as 20.0 g of mercury, with a density of 13.6 g/cm3?

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