Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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x 100 (100 is exact)
e.
9.875 x 102
5. a) At what temperature is the temperature in degrees Fahrenheit equal to
twice the temperature in degrees Celsius?
b) The average daytime temperatures on earth and Jupiter are 72 °F and
313 K, respectively. Calculate the difference in temperature, in C.
between these two planets.
6. For a material to float on the surface of the water, the material must
have a density less than that of water (1.0 g/mL) and must not react with
the water or dissolve in it. A spherical ball has a radius of 0.50 cm and
weighs 2.0 g. Will this ball float or sink when placed in water? (Note:
Volume of a sphere r .)
7. a)Using examples, explain the difference between a physical property and
a chemical property. b) Do the following statements describe chemical or
physical properties?
(i) Oxygen gas supports combustion. (ii) Fertilizers help to increase
agricultural production. ii) Water boils below 100°C on top of a
mountain. (iv) Lead is denser than aluminum. (v) Uranium…
6. What is the mass, in g, of a piece of iron that has a volume of 1.50 x 10² and a density of
7.20 g/mL?
8.A) The density of a metal sphere is 25.0 g/L and has a mass of 1.55 mg. What is the radius of the sphere in cm?
B) Calculate the following:
5.4 x 10-3 + 2.22 x 10-1
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- What is the difference in surface area between two circles, one of radius 7.98 cm, the other of radius 8.50 cm? The surface area of a circle of radius r is r2. Obtain the result to the correct number of significant figures.arrow_forwardGold leaf, which is used for many decorative purposes, is made by hammering pure gold into very thin sheets. Assuming that a sheet of gold leaf is 1.27 105 cm thick, how many square feet of gold leaf could be obtained from 28.35 g gold? The density of gold is 19.3 g/cm3.arrow_forwardProviding no reaction occurs, a solid will float on any liquid that is more dense than it is. The volume of a piece of calcite weighing 35.6 g is 12.9 cm3. On which of the following liquids will the calcite float: carbon tetrachloride (density = 1.60 g/cm3), methylene bromide (density = 2.50 g/cm3), tetrabromoethane (density = 2.96 g/cm3), or methylene iodide (density = 3.33 g/cm3)?arrow_forward
- 9. Lithium is the least dense metal known (density: 0.53 g/cm^3). What is the volume occupied by 1.20 x10^3 g of lithium?arrow_forward6. My car gas tank holds 14.2 gallons of gas. 10.9 kg of carbon dioxide, CO₂, is produced per 1.00 gallon of gas burned. How many pounds of CO₂ is produced from a full tank of gas? (1 kg = 2.205 lb.)arrow_forward19. DETAILS Calculate these masses. (a) What is the mass (in g) of 2.57 cm³ of lithium, density = 0.534 g/cm³? 4.0✔ g (b) What is the mass (in g) of 185 mL nitrogen gas, density = 1.145 g/L? 4.0✔ g Supporting Materials Periodic Table Additional Materials eBook OSGENCHEM2 1.6.E.090. Show My Work (Optional)? Constants and Factors Supplemental Data MY NOTES ASK YOUR TEACHER PRACTICE ANOTHERarrow_forward
- 11. Calculate the area ofa circle with a radius of 10.0 m. Express your answer in square centimeters ( cm?). A = r² .arrow_forward5. How many minutes does it take light from the sun to reach Earth? (The distance from the sun to Earth is 93 million miles; the speed of light = 3.00 X 10^8 m/s.)arrow_forwardBud N. Chemist must determine the density of a mineral sample. His five trials yield densities of 5.15 g/cm3, 4.83 g/cm3, 5.08 g/cm3, 4.97 g/cm3, 5.12 g/cm3. Independent studies found the correct density to be 5.06 g/cm3. Which of the following is incorrect? a. The mean of his analysis is 5.03 g/cm3 indicating an error of 0.03 g/cm3 from the correct density B.His data has a standard deviation of 0.017 g/cm3 C.His data has a relative standard deviation of 2.60% D. He can report his analyzed density as 5.0±0.2 g/cm3 at a 95% confidence level E. The true value (population mean) is found within the confidence interval of Bud’s workarrow_forward
- 3. A student is using a 10 mL volumetric pipet to dispense water and wants to test how accurate the volume is by weighing the water dispensed from the pipet. First, they measure the mass of a beaker to be 30.045 ± 0.005 g. They then collect 10 mL of water into the volumetric pipet and dispense the water into the beaker. The mass of the beaker plus the water is 40.081 ± 0.005 g. Calculate the mass of the water added to the beaker and use propagation of error to calculate the uncertainty of the mass. Report the mass of the water with the uncertainty with appropriate significant figures.arrow_forward8) To determine the volume of an irregular shaped object, it is dropped into a graduate cylinder containing 12.00 cm³ of water. The water level increased to 17.7 cm³. Its volume is cm³. If the mass of the object is 10.765 g, what is the density of the object?arrow_forwardThe length of a 262 mm line can also be expressed as: (choose one of the choices) Hint: you must look at answer choices and determine which ones are wrong. O 2.62 x 10 -2 m O 2.62 x 10 m O 2.62 x 10 6 km O 26.2 dm O 0.262 cm 26.2 cmarrow_forward
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