26.07.2021 Views

General Chemistry Principles, Patterns, and Applications, 2011

General Chemistry Principles, Patterns, and Applications, 2011

General Chemistry Principles, Patterns, and Applications, 2011

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

chlorofluorocarbons withhydrochlorofluorocarbons (HCFCs) or hydrofluorocarbons (HFCs) is one<br />

strategy that has been developed to minimize further damage to Earth’s ozone layer.<br />

K E Y T A K E A W A Y<br />

<br />

The composition of Earth’s atmosphere is vulnerable to degradation through reactions<br />

with common industrial chemicals.<br />

CON C E PTUAL P R OBLEMS<br />

1. Carbon monoxide is a toxic gas that can be produced from the combustion of wood in wood-burning stoves<br />

when excess oxygen is not present. Write a balanced chemical equation showing how carbon monoxide is<br />

produced from carbon <strong>and</strong> suggest what might be done to prevent it from being a reaction product.<br />

2. Explain why stratospheric ozone depletion has developed over the coldest part of Earth (the poles) <strong>and</strong><br />

reaches a maximum at the beginning of the polar spring.<br />

3. What type of reactions produce species that are believed to be responsible for catalytic depletion of ozone in<br />

the atmosphere?<br />

N U M E R I C A L PR O BL E M<br />

Please be sure you are familiar with the topics discussed in Essential Skills 2 (Section 3.7 "Essential Skills 2")<br />

before proceeding to the Numerical Problems.<br />

1. Sulfur dioxide <strong>and</strong> hydrogen sulfide are important atmospheric contaminants that have resulted in the<br />

deterioration of ancient objects. Sulfur dioxide combines with water to produce sulfurous acid, which then<br />

reacts with atmospheric oxygen to produce sulfuric acid. Sulfuric acid is known to attack many metals that<br />

were used by ancient cultures. Give the formulas for these four sulfur-containing species. What is the<br />

percentage of sulfur in each compound? What is the percentage of oxygen in each?<br />

3.7 Essential Skills 2<br />

T O PI C S<br />

<br />

<br />

<br />

Proportions<br />

Percentages<br />

Unit Conversions<br />

In Essential Skills 1 in Chapter 1 "Introduction to <strong>Chemistry</strong>", Section 1.9 "Essential Skills 1", we introduced you to<br />

some of the fundamental mathematical operations you need to successfully manipulate mathematical equations in<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

289

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!