Introductory Chemistry Atoms First

Steve Russo; Mike Silver

Chapter 4

The Modern Model of the Atom - all with Video Answers

Educators

Section 1

Seeing the Light-A New Model of the Atom

Problem 1

(a) Write a structural formula for a sulfide having the molecular formula $\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{~S}$. (b) What two thiols have the molecular formula $\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{~S}$ ?

Dalton Hilovsky

Dalton Hilovsky

Numerade Educator

Problem 1

What is the energy of blue light that has a wavelength of $450.0 \mathrm{~nm}$ ?

David Collins

Numerade Educator

Problem 2

Many compounds contain more than one functional group. Elenolic acid is obtained from olive oil and contains three carbonyl groups. Classify each type according to Table 4.1. Identify the most acidic proton in elenolic acid and use Table $1.8$ to estimate its $\mathrm{p} K_{\mathrm{a}}$

David Collins

Numerade Educator

Problem 2

What is the energy of red light with a wavelength of $660.5 \mathrm{~nm}$ ?

David Collins

Numerade Educator

Problem 3

What are the wavelength and color of light that has an energy of $3.50 \times 10^{-19} \mathrm{~J}$ ? (Hint:
Use algebraic manipulation to solve the energy equation for $\lambda$. You will get an answer in meters. Convert it to nanometers $\left(10^{-9} \mathrm{~nm}=1 \mathrm{~m}\right)$ and consult the electromagnetic spectrum shown on page 122.)

David Collins

Numerade Educator

Problem 4

Which type of electromagnetic radiation has a wavelength roughly on the order of the height of a person? What can you say about the energy of this radiation?

David Collins

Numerade Educator