Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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Indicate the number of significant figures in each number. If the number is an exact number, indicate an unlimited number of significant figures.a. 318,857,056 (2014 U.S. population) b. 2.54 cm = 1 inc. 11.4 g/cm3 (density of lead) d. 12 = 1 dozen
It is known that the density of mercury is 13.54 times the density of water. What volume of this mercury in liters would weigh the same as 0.020m^3 of fuel oil, when the fuel oil weighs 9.42kN for every cubic meter?
a. 71
b. 1.42
c. 1.7
d. 2.4
4. Write the number of significant figures in each of the following. Write the word exact if
the value is exact with infinite significant figures.
a. 100 cm in 1 m
b. 1.094 yds = 1 m
C. T (pi) is approximately 3.14159 exncti6
d. 150 pages in a book
e. A mile is about 5300 feet
f. A mile is 5280 feet
g. 1000 grams in 1 kg
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- The “Chemistry in Focus” segmentTiny Thermometersstates that the temperature range for the carbon nanotube gallium thermometers is 50 °C to 500 °C. a. What properties of gallium make it useful in a thermometer? b. Determine the useful temperature range for the gallium thermometer in Fahrenheit units.arrow_forwardAt high noon on the lunar equator the temperature may reach 243 F. At night the temperature may sink to -261 F. Express the temperature difference in degrees Celsius.arrow_forward4. Calculate the density of the following materials for which the mass and volume of samples have been measured. Express the density of liquids in g/mL, the density of solids in g/cm3, and the density of gases in g/L. a. 250 mL of liquid mercury metal (Hg) has a mass of 3400 g. b. 500. mL of concentrated liquid sulfuric acid (H2SO4) has a mass of 925 g. c. 5.00 L of oxygen gas has a mass of 7.15 g. d. A 200-cm3block of magnesium metal (Mg) has a mass of 350 g.arrow_forward
- A. Rounding Off A.1 Rounding A student rounded off the following calculator displays to three significant figures. Indicate if the rounded number is correct. If it is incorrect, round off the display value properly. Calculator Student's Correct (yes/no). Corrected (if needed) Display Rounded Value 24.4704 24.5 143.63212 144 532 800 530 0.00858345 0.009 8. 8.00 17arrow_forwardJust number 42.arrow_forwardPlease show me how to do this conversion using standard scientific noarrow_forward
- 15. Complete this table so that all the measurements in each row have the same value. Use the metric staircase. How mg 6.6 x 10³ 26×107 g 2.8 x 104 cg 28.3 16. What equation is used to determine the density of an object? mass Dz Vakume kg 17. Would the density of a person be the same on the surface of the Earth and o he surface of the moon? Explain.arrow_forwardCalculate the areas and densities. Report the answers in the correct units.a. the area of a rectangle with sides measuring 3 × 1 0 1 cm and 3 × 1 0 -2 cmb. the area of a rectangle with sides measuring 1 × 1 0 3 cm and 5 × 1 0 -1 cmc. the density of a substance having a mass of 9 × 1 0 5 g and a volume of 3 × 1 0 -1 c m 3d. the density of a substance having a mass of 4 × 1 0 -3 g and a volume of 2 × 1 0 -2 c m 3arrow_forwardUse the prefix multipliers to express each measurement without exponents. a. 1.2 x 10-9 m b. 22 x 10-1 s c. 1.5 x 10°g d. 3.5 x 10°Larrow_forward
- 16. A mixture is made by adding 20.42 g of substance A, 1.322 g of substance B, and 83.1 g of substance C. Calculate the total mass of the mixture with the proper number of significant figures. 17. The average speed of a nitrogen molecule in air at 25 °C is 515 m/s. Convert this speed to miles per hour.arrow_forwardRead each measurement to the correct number of significant figures. Laboratory glassware should always be read from the bottom of the meniscus. 80 600 70 500 a. b. c.arrow_forward1. Which is higher: 85.7 °F or 28.9 °C ? 2. The boiling point of a liquid is calculated to be 325 K. What is this temperature on the Celsius and Fahrenheit scales? 3. The melting point of an unknown solid is determined to be 33.0°C. What is this temperature on the Fahrenheit and Kelvin scales?arrow_forward
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