Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Chapter 2, Problem 34E
Open the Build a Molecule simulation (http://openstaxcollege.org/l/16molbuilding) and select the “Larger Molecules” tab. Select an appropriate atoms “Kit” to build a molecule with two carbon and six hydrogen atoms. Drag atoms into the space above the “Kit” to make a molecule. A name will appear when you have made an actual molecule that exists (even if it is not the one you want). You can use the scissors tool to separate atoms if you would like to change the connections. Click on “3D” to see the molecule, and look at both the space-filling and ball-and-stick possibilities.
- Draw the structural formula of this molecule and state its name.
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Solve the given problem using an element that has three naturally occurring isotopes.
Click on the site (http://openstaxcollege.org/l/16PhetAtomMass) and select the “Mix Isotopes” tab, hide the “Percent Composition” and “Average Atomic Mass” boxes, and then select the element boron.(a) Write the symbols of the isotopes of boron that are shown as naturally occurring in significant amounts.(b) Predict the relative amounts (percentages) of these boron isotopes found in nature. Explain the reasoning behind your choice.(c) Add isotopes to the black box to make a mixture that matches your prediction in (b). You may drag isotopes from their bins or click on “More” and then move the sliders to the appropriate amounts.(d) Reveal the “Percent Composition” and “Average Atomic Mass” boxes. How well does your mixture match with your prediction? If necessary, adjust the isotope amounts to match your prediction.(e) Select “Nature’s” mix of isotopes and compare it to your prediction. How well does…
Using triangles to represent one type of atom and circles to represent another type of atom, draw one image to represent a mixture of the two atoms and draw another image to represent a compound composed of the two atoms.
In 1961, scientists agreed that the atomic mass unit (amu) would be defined as 1/ 12 the mass of an atom of 12C. Before then, it was defined as 1 /16 the average mass of an atom of naturally occurring oxygen (a mixture of 16O, 17O, and 18O). The current atomic mass of oxygen is 15.9994 amu. (a) Did Avogadro’s number change after the definition of an amu changed and, if so, in what direction? (b) Did the definition of the mole change? (c) Did the mass of a mole of a substance change? (d) Before 1961, was Avogadro’s number 6.02x1023 (to three significant figures), as it is today?
Chapter 2 Solutions
Chemistry by OpenStax (2015-05-04)
Ch. 2 - In the following drawing, the green spheres...Ch. 2 - Which postulate of Dalton’s theory is consistent...Ch. 2 - Identify the postulate of Dalton’s theory that is...Ch. 2 - Samples of compound X, Y, and Z are analyzed, with...Ch. 2 - The existence of isotopes violates one of the...Ch. 2 - How are electrons and protons similar? How are...Ch. 2 - How are protons and neutrons similar? How are they...Ch. 2 - Predict and test the behavior of a particles fired...Ch. 2 - Predict and test the behavior of a particles fired...Ch. 2 - In what way are isotopes of a given element always...
Ch. 2 - Write the symbol for each of the following ions:...Ch. 2 - Write the symbol for each of the following ions:...Ch. 2 - Open the Build an Atom simulation...Ch. 2 - Open the Build an Atom simulation...Ch. 2 - Open the Build an Atom simulation...Ch. 2 - Determine the number of protons, neutrons, and...Ch. 2 - The following are properties of isotopes of two...Ch. 2 - Give the number of protons, electrons, and...Ch. 2 - Give the number of protons, electrons, and...Ch. 2 - Click on the site...Ch. 2 - Click on the site...Ch. 2 - An element has the following natural abundances...Ch. 2 - Average atomic masses listed by JUPAC are based on...Ch. 2 - Variations in average atomic mass may be observed...Ch. 2 - The average atomic masses of some elements may...Ch. 2 - The 18O:16O abundance ratio in some meteorites is...Ch. 2 - Explain why the symbol for an atom of the element...Ch. 2 - Explain why the symbol for the element sulfur and...Ch. 2 - Write the molecular and empirical formulas of the...Ch. 2 - Write the molecular and empirical formulas of the...Ch. 2 - Determine the empirical formulas for the following...Ch. 2 - Determine the empirical formulas for the following...Ch. 2 - Write the empirical formulas for the following...Ch. 2 - Open the Build a Molecule simulation...Ch. 2 - Open the Build a Molecule simulation...Ch. 2 - Open the Build a Molecule simulation...Ch. 2 - Using the periodic table, classify each of the...Ch. 2 - Using the periodic table, classify each of the...Ch. 2 - Using the periodic table, Identify the lightest...Ch. 2 - Using the periodic table, Identify the heaviest...Ch. 2 - Use the periodic table to give the name and symbol...Ch. 2 - Use the periodic table to give the name and symbol...Ch. 2 - Write a symbol for each of the following neutral...Ch. 2 - Write a symbol for each of the following neutral...Ch. 2 - Using the periodic table, predict whether the...Ch. 2 - Using the periodic table, predict whether the...Ch. 2 - For each of the following compounds, state whether...Ch. 2 - For each of the following compounds, state whether...Ch. 2 - For each of the following pairs of ions, write the...Ch. 2 - For each of the following pairs of ions, write the...Ch. 2 - Name the following compounds: CsCl BaO K2S BeCl2...Ch. 2 - Name the following compounds: NaF Rb2O BCl3 H2Se...Ch. 2 - Write the formulas of the following compounds:...Ch. 2 - Write the formulas of the following compounds:...Ch. 2 - Write the formulas of the following compounds:...Ch. 2 - Write the formulas of the following compounds:...Ch. 2 - Each of the following compounds contains a metal...Ch. 2 - Each of the following compounds contains a metal...Ch. 2 - The following ionic compounds are found in common...Ch. 2 - The following ionic compounds are found in common...Ch. 2 - What are the IUPAC names of the following...
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- Open the Build a Molecule simulation (http://openstaxcollege.org/l/16molbuilding) and select the Larger Molecules tab. Select an appropriate atoms Kit to build a molecule with two carbon and six hydrogen atoms. Drag atoms into the space above the Kit to make a molecule. A name will appear when you have made an actual molecule that exists (even if it is not the one you want). You can use the scissors tool to separate atoms if you would like to change the connections. Click on 3D to see the molecule, and look at both the space-filling and ball-and-stick possibilities. Draw the structural formula of this molecule and state its name. Can you arrange these atoms in any way to make a different compound? 36. Use the Build a Molecule simulation (http://openstaxcollege.org/l/16molbuilding) to repeat Exercise 2.34, but build a molecule with three carbons, seven hydrogens, and one chlorine. Draw the structural formula of this molecule and slate its name. Can you arrange these atoms to make a different molecule? If so, draw its structural formula and state its name. How are the molecules drawn in (a) and (b) the same? How do they differ? What are they called (the type of relationship between these molecules, not their names)?arrow_forwardClick on the site (http://openstaxcollege.org/l/16PhetAtomMass) and select the Mix Isotopes tab, hide the Percent Composition and Average Atomic Mass boxes, and then select the element boron. Write the symbols of the isotopes of boron that are shown as naturally occurring in significant amounts. Predict the relative amounts (percentages) of these boron isotopes found in nature. Explain the reasoning behind your choice. Add isotopes to the black box to make a mixture that matches your prediction in (b). You may drag isotopes from their bins or click on More and then move the sliders to the appropriate amounts. Reveal the Percent Composition and Average Atomic Mass boxes. How well does your mixture match with your prediction? If necessary, adjust the isotope amounts to match your prediction. Select Nature’s mix of isotopes and compare it to your prediction. How well does your prediction compare with the naturally occurring mixture? Explain. If necessary, adjust your amounts to make them match Nature’s amounts as closely as possible. 21. Repeat Exercise 2.20 using an element that has three naturally occurring isotopes.arrow_forwardClick on the site (http://openstaxcollege.org/l/16PhetAtomMass) and select the Mix Isotopes tab, hide the Percent Composition and Average Atomic Mass boxes, and then select the element boron. Write the symbols of the isotopes of boron that are shown as naturally occurring in significant amounts. Predict the relative amounts (percentages) of these boron isotopes found in nature. Explain the reasoning behind your choice. Add isotopes to the black box to make a mixture that matches your prediction in (b). You may drag isotopes from their bins or click on More and then move the sliders to the appropriate amounts. Reveal the Percent Composition and Average Atomic Mass boxes. How well does your mixture match with your prediction? If necessary, adjust the isotope amounts to match your prediction. Select Nature’s mix of isotopes and compare it to your prediction. How well does your prediction compare with the naturally occurring mixture? Explain. If necessary, adjust your amounts to make them match Nature’s amounts as closely as possible.arrow_forward
- Reference Section 5-2 to find the atomic masses of 12C and 13C, the relative abundance of 12C and 13C in natural carbon, and the average mass (in u) of a carbon atom. If you had a sample of natural carbon containing exactly 10,000 atoms, determine the number of 12C and 13C atoms present. What would be the average mass (in u) and the total mass (in u) of the carbon atoms in this 10,000-atom sample? If you had a sample of natural carbon containing 6.0221 1023 atoms, determine the number of 12C and 13C atoms present What would be the average mass (in u) and the total mass (in u) of this 6.0221 1023 atom sample? Given that 1 g = 6.0221 1023 u, what is the total mass of I mole of natural carbon in units of grams?arrow_forward2.94 Use a molecular level description to distinguish between LDPE and HDPE.arrow_forwardGive three examples of gaseous elements that exist as diatomic molecules. Give three examples of gaseous elements that exist as monatomic species.arrow_forward
- The element europium exists in nature as two isotopes: 151Eu has a mass of 150.9196 u and 153Eu has a mass of 152.9209 u. The average atomic mass of europium is 151.96 u. Calculate the relative abundance of the two europium isotopes.arrow_forwardEuropium has two stable isotopes, 151Eu and 153Eu, with masses of 150.9197 u and 152.9212 u, respectively. Calculate the percent abundances of these isotopes of europium.arrow_forwardAssume silicon has three major isotopes in nature as shown in the table below. Fill in the missing information. Isotope Mass (u) Abundance 28Si 27.98 _____ 29Si ____ 4.70% 30Si 29.97 3.09%arrow_forward
- How is a structural formula similar to a molecular formula?How is it different?arrow_forwardOn the planet Kracalac, in another solar system, argon has three naturally occurring isotopes as follows: Isotope Mass (amu) Natural Abundance (%) Argon-36 35.968 10.65 Argon-38 37.963 15.15 Argon-40 39.962 74.20 What is the average atomic mass of argon on Kracalac?arrow_forward
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