Concept explainers
(a)
Interpretation:
Radius of sodium atom,
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;
(b)
Interpretation:
Concept Introduction:
Refer part (a).
(c)
Interpretation:
Single conversion factor has to be written between nanometers and ångström.
Concept Introduction:
Refer part (a).
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CHEM PRINCIPLES LL W/ACHIEVE ONE-SEM
- Which of these statements are qualitative? Which are quantitative? Explain your choice in each case. (a) Sodium is a silvery-white metal. (b) Aluminum melts at 660 C. (c) Carbon makes up about 23% of the human body by mass. (d) Pure carbon occurs in different forms: graphite, diamond, and fullerenes.arrow_forwardAssume 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_forward4-102 Aspartame, an artificial sweetener used as a sugar substitute in some foods and beverages, has the molecular formula C14H18N2O5. (a) How many mg of aspartame are present in 3.72 × 1026 molecules of aspartame? (b) Imagine you obtain 25.0 mL of aspartame, which is known to have a density of 1.35 g/mL. How many molecules of aspartame are present in this volume? (c) How many hydrogen atoms are present in 1.00 mg of aspartame? (d) Complete the skeletal structure of aspartame, where all the bonded atoms are shown but double bonds, triple bonds, and/or lone pairs are missing. (e) Identify the various types of geometries present in each central atom of aspartame using VSEPR theory. (f) Determine the various relative bond angles associated with each central atom of aspartame using VSEPR theory. (g) What is the most polar bond in aspartame? (h) Would you predict aspartame to be polar or nonpolar? (i) Is aspartame expected to possess resonance? Explain why or why not. (j) Consider the combustion of aspartame, which results in formation of NO2(g) as well as other expected products. Write a balanced chemical equation for this reaction. (k) Calculate the weight of C02(g) that can be prepared from 1.62 g of aspartame mixed with 2.11 g of oxygen gas.arrow_forward
- One 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_forward9. When a candle has been burning for an hour, its mass is less than it was at the beginning. (a) How is it possible for the candle to lose mass without violating the law of conservation of mass? (b) How might you find the mass of the missing material? 14. Hydrochloric acid reacts with zinc. The chemical equation for this reaction is Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq) a) Classify this reaction. (b) Name the product that forms bubbles in this reaction. How do you know? c) How does the mass of zinc metal change as the reaction proceeds? d) What does the (aq) symbol in the equation mean? 24. Consider this chemical equation: Zn + 2 AgNO3 → Zn(NO3)2 + 2 Ag a) How many atoms of zinc are on the left side of the equation? How many are on the right? (b) How many atoms of silver are on the left side of the equation? How many are on the right? (c) Is the equation balanced? Explain. 25.How are coefficients different from subscripts in equations? 30. Consider this neutralization reaction: HCl +…arrow_forward7. Suppose you make a solution that contains 17.59 g of sodium chloride and 960 g of water. (a) What is the mass % of sodium chloride? (b) If 16.47 mL of your solution weighs 16.651 g,what is the density (in g/cc)?arrow_forward
- I only need parts B and D, thank you! The following quantities are placed in a container: 1.98 × 10^24 atoms of hydrogen, 1.32 mol of sulfur, and 113.8 g of diatomic oxygen. (b) What is the total number of moles of atoms for the three elements? (c) If the mixture of the three elements formed a compound with molecules that contain two hydrogen atoms, onesulfur atom, and four oxygen atoms, which substance is consumed first? (d) How many atoms of each remaining element would remain unreacted in the change described in (c)?arrow_forwardWhich piece of equipment would you use to measure 7.10 mL of CuSO4 (aq)?arrow_forwardThe legal limit for chromium in drinking water is 0.10 ppm. What is the maximum permissible mass of chromium (in \mu gμg) in exactly 1.0 cup (8.0 fl. oz.) of drinking water? Assume the density of drinking water is 1.00 g/mL. (1 fl. oz. = 29.57 mL)(Express your answer with two significant digits.)arrow_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_forward(c) In the core of the modern Sun, the density is about 1.25 x 105 kg/m³. What is the concentration of hydrogen (in moles/m³) in the Sun's core, if the abundance of hydrogen is equal to the value shortly after big bang (i.e. 75% of the mass)? Convert your concentration to units of atoms/m³.arrow_forwardWrite the balanced chemical equation for the neutralization reaction that occurs when an aqueous solution of hydrobromic acid (HBr) is mixed with an aqueous solution of lithium hydroxide (LIOH). Indicate the physical states of the reactants and products using the abbreviations (s), (1), (g), or (aq) for solids, liquids, gases, or aqueous solutions, respectively. Express your answer as a chemical equation. • View Available Hint(s) ΑΣφ ?arrow_forward
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