Concept explainers
Interpretation:
Among the two wavelength,
Concept Introduction:
Measurement is the measure of quantity, capacity, dimensions or extent of something. Mass, length, pressure, temperature, volume, time and concentration are some common type of measurements. English system and metric system are two types of measurement systems that are in use in the United States. Measurement wise both English system and metric system are precise. There are instance where measurements from one system has to be changed to their equivalent in other system. This is done by dimensional analysis, which involves conversion factors. Conversion factor is a ratio that indicates how one unit of measurement is related to another unit of measurement. This can be expressed as shown below;
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Chemical Principles: The Quest for Insight
- Assume that the radius of Earth is 6400 km, the crust is 50. km thick, the density of the crust is 3.5 g/cm3, and 25.7% of the crust is silicon by mass. Calculate the total mass of silicon in the crust of Earth.arrow_forwardThe present average concentration (mass percent) of magnesium ions in seawater is 0.13%. A chemistry textbook estimates that if 1.00 × 108 tons Mg were taken out of the sea each year, it would take one million years for the Mg concentration to drop to 0.12%. Do sufficient calculations to either verify or refute this statement. Assume that Earth is a sphere with a diameter of 8000 mi, 67% of which is covered by oceans to a depth of 1 mi, and that no Mg is washed back into the oceans at any time.arrow_forward(a) Atoms are very small compared to objects on the macroscopic scale. The radius of a aluminum atom is 143 pm. What is this value in meters and in centimeters? m cm (b) The mass of a single aluminum atom is 4.48×10-23 g. Suppose enough Al atoms were lined up like beads on a string to span a distance of 37.7 cm (15 inches). How many atoms would be required? atoms What mass in grams of Al would be used? g Could you weigh out this amount of aluminum using a typical laboratory balance? (c) Taking the density of aluminum metal to be 2.70 g/cm³, calculate the mass of metal needed to form a piece of Al wire with the same length as the distance in b, but with a diameter of 1.00 mm. Hint: The volume of a cylinder is n times its radius squared times its height. (V = n r² h) How many aluminum atoms does this represent? g atomsarrow_forward
- 51. A concentrated perchloric acid solution is 65.8% HClO4 by mass and its density is 1.68 g mL−1. What volume (in litres) of the concentrated perchloric acid solution is needed to make 1.81 L of 2.62 mol L−1 HClO4(aq)?arrow_forwardOne way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is by titrating a sample of silver nitrate solution. Any chloride anions in solution will combine with the silver cations to produce bright white silver chloride precipitate. Suppose an EPA chemist tests a 200. mL sample of groundwater known to be contaminated with iron(III) chloride, which would react with silver nitrate solution like this: FeCl3(aq) + 3 AgNO3(aq) 3 AgCl(s) + Fe(NO3),(a9) The chemist adds 56.0 mM silver nitrate solution to the sample until silver chloride stops forming. She then washes, dries, and weighs the precipitate. She finds she has collected 2.8 mg of silver chloride. Calculate the concentration of iron(III) chloride contaminant in the original groundwater sample. Be sure your answer has the correct number of significant digits. mg L Submit Assignment Continue Accessibility Privacy O 2020 McGraw-Hill Education. All Rights Reserved. Terms of Use 888 %23 5 6 2 3 E R. G…arrow_forwardWhich piece of equipment would you use to measure 7.10 mL of CuSO4 (aq)?arrow_forward
- When tin comes into contact with oxygen in the air, tin (IV) oxide, SnO2 is formed. Sn (s) + O2 (g) SnO2 (s) A piece of tin foil, 8.25 cm x 21.5 cm x 0.600 mm (d = 7.28 g / cm), exposed to oxygen. (A) Assuming the reaction of all tin, what is the mass of the oxidized tin foil? (B) Air is about 21% oxygen by volume (d = 1.309 g / L at 25 ° C, 1 atm). How many liters of air is required to fully react with tin foil?arrow_forwardMagnesium is a valuable, lightweight metal. It is used as a structural metal and in alloys, in batteries, and in chemical synthesis. Although magnesium is plentiful in Earth's crust, it is cheaper to "mine" the metal from seawater. Magnesium forms the second most abundant cation in the sea (after sodium); there are about 1.30 g of magnesium in 1.00 kg of seawater. The method of obtaining magnesium from seawater employs all three types of reactions discussed in this chapter precipitation, acid-base, and redox reactions. In the first stage in the recovery of magnesium, limestone (CaCO3) is heated at high temperatures to produce quicklime, or calcium oxide (CaO): CaCO3(s) -----> CaO(s) + CO2a) When calcium oxide is treated with seawater, it forms calcium hydroxide [Ca(OH)], which is slightly soluble and ionizes to give Ca2* and OH ions: CaO(s) + H2Om-> Ca (aq) +2 OH (aq) The surplus hydroxide ions cause the much less soluble magnesium hydroxide to precipitate: Mg (aq) + 2 OH (aq)…arrow_forwardIt has been estimated that there is 4 x 10^-4 mg of gold per liter of seawater. At a price of $19.40/g, what would be the value of the gold in 1 km^3 (1 x 10^25 cm^3) of the ocean?arrow_forward
- Over coffee and croissants at breakfast one day, your friend Jane (an expert chemist) says this: "Metal sulfides react with strong acids to produce hydrogen sulfide and a salt." Using Jane's statement, and what you already know about chemistry, predict the products of the following reaction. Be sure your chemical equation is balanced! Nis (s) + HCl(aq) → 0 ローロ 0+0 X C READarrow_forwardIf 25.00 mL of a solution of sodium hydroxide (NaOH) is exactly neutralised by 13.47 mL of 0.131 mol L sulfuric acid (H₂SO4), what is the concentration of the NaOH 2 NaOH(ag) + H₂SO(aq) Na₂SO4(aq) + 2 H₂00) Give your answer to three (3) significant figures Do not use scientific notation to express your answer. You do not need to include units with your answer.arrow_forwardChlor-alkali plants electrolyze NaCl to produce the commodity chemicals caustic soda and chlorine gas. Industrial waste effluent released into waterways from these plants can contain trace amounts of mercury. Legally, the effluent can contain up to 2.50 x 10-9 mol/L of mercury. Determine the minimum volume of water, in megalitres (ML), that must be added to a 1.14 g sample of mercury to dilute the effluent to acceptable levels. Record only your numerical answer with the correct number of significant digits. You do not need to include units as the units appear for you beside the answer box already.arrow_forward
- General Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning