Chemistry In Context
9th Edition
ISBN: 9781259638145
Author: Fahlman, Bradley D., Purvis-roberts, Kathleen, Kirk, John S., Bentley, Anne K., Daubenmire, Patrick L., ELLIS, Jamie P., Mury, Michael T., American Chemical Society
Publisher: Mcgraw-hill Education,
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Chapter 4.3, Problem 4.9YT
Skill Building Isotopes of Nitrogen
Nitrogen (N2) is an important element in the atmosphere and biological systems. It consists of two naturally occurring isotopes: N-14 and N-15.
- a. Use the periodic table to find the
atomic number andatomic mass of nitrogen atoms. - b. What is the number of protons, neutrons, and electrons in a neutral atom of N-14?
- c. Compare your answers for part b with those for a neutral atom of N-15.
- d. Given the atomic mass of nitrogen, which isotope has the greatest
natural abundance ? Refer to Connect for the simulation to confirm your answer.
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Identifying the major species in weak acid or weak base equilibria
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Identifying the major species in weak acid or weak base equilibria
The preparations of two aqueous solutions are described in the table below. For each solution, write the chemical formulas of the major species present at
equilibrium. You can leave out water itself.
Write the chemical formulas of the species that will act as acids in the 'acids' row, the formulas of the species that will act as bases in the 'bases' row, and the
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acids:
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bases:
Х
other: ☐
acids:
0.10 mol of HI is added to
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Identifying the major species in weak acid or weak base equilibria
The preparations of two aqueous solutions are described in the table below. For each solution, write the chemical formulas of the major species present at
equilibrium. You can leave out water itself.
Write the chemical formulas of the species that will act as acids in the 'acids' row, the formulas of the species that will act as bases in the 'bases' row, and the
formulas of the species that will act as neither acids nor bases in the 'other' row.
You will find it useful to keep in mind that NH3 is a weak base.
acids: ☐
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bases: ☐
solution.
other: ☐
0.18 mol of HNO3 is added
to 1.0 L of a solution that is
1.4M in both NH3 and
NH₁Br.
acids:
bases: ☐
other: ☐
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000
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Chapter 4 Solutions
Chemistry In Context
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