The fraction of the isotope remains after 449 days has to be calculated. Concept introduction: The decay constant used to define the quantity of radioactive material that remains after time period has gone. The fraction of material that leftovers after a time period gas gone is the ratio of the number of radioactive nuclei ( N g ) in the real sample when the measurement happening. This segment is frequently expressed as a percent. The equation relating fraction of nuclei after a period of time has elapsed to the decay constant (ln N t N g = -kt)

Question

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: ☐ 1.8 mol of HCl is added to 1.0 L of a 1.0M NH3 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: ☐ 0,0,... ? 000 18 Ar B 1

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Question

Chapter 20, Problem 20.21QP

Interpretation Introduction

Interpretation:

The fraction of the isotope remains after 449 days has to be calculated.

Concept introduction:

The decay constant used to define the quantity of radioactive material that remains after time period has gone. The fraction of material that leftovers after a time period gas gone is the ratio of the number of radioactive nuclei ( Ng ) in the real sample when the measurement happening. This segment is frequently expressed as a percent.

The equation relating fraction of nuclei after a period of time has elapsed to the decay constant (lnNtNg= -kt)

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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: ☐ 1.8 mol of HCl is added to 1.0 L of a 1.0M NH3 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: ☐ 0,0,... ? 000 18 Ar B 1

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