Concept explainers
In a reproduction of the Millikan oil-drop experiment, a student obtains the following values for the charges on nine different oil droplets.
(a) Based on these data alone, what is your best estimate of the number of electrons on each of the above droplets? (Hint: Begin by considering differences in charges between adjacent data points, and see into what groups these are categorized.)
(b) Based on these data alone, what is your best estimate of the charge on the electron?
(c) Is it conceivable that the actual charge is half the charge you calculated in (b)? What evidence would help you decide one way or the other?
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Chapter 1 Solutions
OWLv2 for Oxtoby/Gillis/Butler's Principles of Modern Chemistry, 8th Edition, [Instant Access], 1 term (6 months)
- Two basic laws of chemistry are the law of conservation of mass and the law of constant composition. Which of these laws (if any) do the following statements illustrate? (a) Lavoisier found that when mercury(ll) oxide, HgO, decomposes, the total mass of mercury (Hg) and oxygen formed equals the mass of mercury(ll) oxide decomposed. (b) Analysis of the calcium carbonate found in the marble mined in Carrara, Italy, and in the stalactites of the Carlsbad Caverns in New Mexico gives the same value for the percentage of calcium in calcium carbonate. (c) Hydrogen occurs as a mixture of two isotopes, one of which is twice as heavy as the other.arrow_forward(11) Name this substance. (c) An unknown atom has 20 neutrons. Its mass is 6.138 x10-23 g. (i) (ii) Determine the chemical symbol of the atom. Show all your calculations. Name this substance.arrow_forward(1. On the second floor of Kent Laboratory a chemistry student in 111B finds that 15.20 g of nitrogen will react with 17.37 g, 34.74 g, or 43.43 g of oxygen to form three different compounds: (a) Calculate the ratio of the mass of oxygen to the mass of nitrogen for each compound and (b) Explain briefly how the numbers in part (a) support the atomic theory.arrow_forward
- Suppose that mercury forms a perfect spherical droplet with a diameter of 5.0 mm. (a) What is the volume of the mercury droplet in cubic centimeters (cm3)? (b) If the density of mercury is 13.6 g/cm3, calculate the mass of the droplet. (c) How many mercury atoms are present in the droplet? (Volume of sphere = (4/3)3.14r3)arrow_forward(a) Atoms are very small compared to objects on the macroscopic scale. The radius of a nickel atom is 125 pm. What is this value in meters and in centimeters? cm -23 (b) The mass of a single nickel atom is 9.75×10 g. Suppose enough Ni atoms were lined up like beads on a string to span a distance of 31.3 cm (12 inches). How many atoms would be required? atoms What mass in grams of Ni would be used? Could you weigh out this amount of nickel using a typical laboratory balance? (c) Taking the density of nickel metal to be 8.91 g/cm, calculate the mass of metal needed to form a piece of Ni 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 = nr h) How many nickel atoms does this represent? atomsarrow_forward(a) Atoms are very small compared to objects on the macroscopic scale. The radius of a vanadium atom is 131 pm. What is this value in meters and in centimeters? cm (b) The mass of a single vanadium atom is 8.46×10-23 g. Suppose enough V atoms were lined up like beads on a string to span a distance of 44.7 cm ( 18 atoms inches). How many atoms would be required? What mass in grams of V would be used? Could you weigh out this amount of vanadium using a typical laboratory balance? (c) Taking the density of vanadium metal to be 6.08 g/cm³, calculate the mass of metal needed to form a piece of V 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 T times its radius squared times its height. (V = T r² h) How many vanadium atoms does this represent? atomsarrow_forward
- 1. The following substances will be used or observed in this experiment. Provide the chemical formula for each substance and state whether it is an element or a compound. If it is an element, state whether it is a metal or a non-metal element in column 4 and leave column 5 blank. If it is a compound, leave column 4 blank and state whether it is an ionic or covalent compound in column 5. (4) Metal or Nonmetal? (only for elements) (5) lonic or Covalent? (only for compounds) (1) Substance (2) Formula (3) Element or Compound? carbon dioxide cobalt(II) chloride cobalt(II) phosphate copper(II) carbonate copper(II) chloridearrow_forward1. Provide the chemical formula (including brackets where appropriate) or systematic name for the following compounds. (a) gold(I) hypoiodite (b) HI(aq): (f) Ca(ClO4)2·4H2O: 2. What mass (in g) of chlorine atoms are there in a sample that consists of 5e+23 molecules of molecular chlorine? INSTRUCTIONS: Report your answer to 3 significant figures in scientific notation unless stated otherwise. DO NOT include the units in your answer.arrow_forward3. (a) Magnesium oxide was formed when the metal burns in air. (i) If 1.25 g of magnesium oxide contains 0.754 g of magnesium, determine the mass ratio of magnesium magnesium oxide. (ii) Calculate the weight of magnesium in 534 g of magnesium oxide.arrow_forward
- Give the names of appropriate element for (a)~(d) in the passages below. (1) (a) and (b) are elements that belong to period 5 and 6 in the periodic table, respectively. Both simple substances are solid under room temperature. To an aqueous solution containing cations of (a) and (b), dilute hydrochloric acid was dropped to produce white precipitate. Upon rinsing with boiling water, the precipitate was partially dissolved. (2) Both (c) and (d) are elements that produce stable trivalent cations in an aqueous solution. To an aqueous solution containing (c) and (d) as trivalent cations, aqueous ammonia was dropped to produce a gel-like precipitate. Upon the addition of concentrated aqueous sodium hydroxide, the precipitate was partially dissolved and the majority of (c ) was transferred to the supernatant.arrow_forward= ===|= | にm▼=, (13 In the compound zinc phosphide, what is the charge In the compound zinc phosphide, what is the charge on the zinc ion? on the phosphide ion? 5. Explain why a 3:2 ratio of ions is necessary for the compound zinc phosphide. 6. Is there any other ratio of zinc and phosphorus ions that could exist? For instance, could you have Zn,P or ZnP,? Explain your answer 7. Explain why you don't need to specify the number of ions in the compound you are naming ionic substances like those in Model 2. 8. Describe how the names of the nonmetal elements in Model 2 are changed when they are in their anion forms.arrow_forward3. The radius of an atom of gold (Au) is about 1.35 A°. (a) Express this distance in nanometers (nm) and in picometers (pm). (b) How many gold atoms would have to be lined up to span 1.0 mm? (c) If the atom is assumed to be a sphere, what is the volume in cm3 of a single Au atom? (Note: unit A is angstrom).arrow_forward
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