chapter 10 nuclear chemistry section 10.2 rates of...

Name ___________________________ Class ___________________ Date _____________ Chapter 10 Nuclear Chemistry Physical Science Reading and Study Workbook Level B ■ Chapter 10 117 © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. Name ___________________________ Class ___________________ Date _____________ Chapter 10 Nuclear Chemistry Section 10.2 Rates of Nuclear Decay (pages 298–301) This section discusses half-lives and explains how nuclear decay can be used to estimate the age of objects. Reading Strategy (page 298) Identifying Details As you read, complete the concept map below to identify details about radiocarbon dating. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Half-life (pages 299–300) 1. Is the following sentence true or false? All radioisotopes decay at the same rate. 2. A half-life is the time required for one half of a sample of a to decay 3. Circle the letter that describes a sample of a radioisotope after two half-lives. a. One eighth of the original sample is unchanged. b. One quarter of the original sample is unchanged. c. Half of the original sample is unchanged. 4. Circle the letter of the correct answer. Iodine-131 has a half-life of 8.07 days. What fraction of a sample of iodine-131 is left unchanged after 16.14 days? a. b. c. 5. Is the following sentence true or false? Like chemical reaction rates, nuclear decay rates vary with the conditions of reaction. 1 8 1 4 1 2 © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. Radiocarbon dating can be used to date objects as old as years uses the radioisotope

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Name ___________________________ Class ___________________ Date _____________

Chapter 10 Nuclear Chemistry

Physical Science Reading and Study Workbook Level B ■ Chapter 10 117

arson

Educ

ation

, Inc

., pu

blish

ing as

Pears

on Pr

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e Hall

. All r

ights

reserv

ed.

IPLS

Name ___________________________ Class ___________________ Date _____________

Chapter 10 Nuclear Chemistry

Section 10.2 Rates of Nuclear Decay (pages 298–301)

This section discusses half-lives and explains how nuclear decay can be used toestimate the age of objects.

Reading Strategy (page 298)

Identifying Details As you read, complete the concept map below toidentify details about radiocarbon dating. For more information on thisReading Strategy, see the Reading and Study Skills in the Skills andReference Handbook at the end of your textbook.

Half-life (pages 299–300)

1. Is the following sentence true or false? All radioisotopes decay at the

same rate. 2. A half-life is the time required for one half of a sample of a

to decay3. Circle the letter that describes a sample of a radioisotope after two

half-lives.

a. One eighth of the original sample is unchanged.b. One quarter of the original sample is unchanged.c. Half of the original sample is unchanged.

4. Circle the letter of the correct answer. Iodine-131 has a half-life of8.07 days. What fraction of a sample of iodine-131 is left unchangedafter 16.14 days?

5. Is the following sentence true or false? Like chemical reaction rates,

nuclear decay rates vary with the conditions of reaction.

arson

Educ

ation

, Inc

., pu

blish

ing as

Pears

on Pr

entic

e Hall

. All r

ights

reserv

ed.

Radiocarbondating

can be used to dateobjects as old as

years

uses the radioisotope

0113_hsps09_GRSW_Ch10.qxd 7/27/07 3:29 PM Page 117

Page 2: Chapter 10 Nuclear Chemistry Section 10.2 Rates of …mrmicco.weebly.com/uploads/1/2/5/8/12584959/psgs1102b.pdf · Like chemical reaction rates, nuclear decay rates vary with the

Use the following table to answer questions 6 and 7.

Half-Lives of Selected RadioisotopesIsotope Half-life

Radon-222 3.82 daysIodine-131 8.07 daysThorium-234 24.1 daysRadium-226 1620 yearsCarbon-14 5730 years

6. Circle the letter that identifies which sample would be the mostunchanged after 100 years.

a. iodine-131b. radium-226c. radon-222

7. Circle the letter of the correct answer. How much of a 1.00 gram sampleof radium-226 is left unchanged after 4860 years?

a. 0.500 gb. 0.250 gc. 0.125 g

Radioactive Dating (pages 300–301)

8. Is the following sentence true or false? Plants and animals continue to

absorb carbon from the atmosphere after they die. 9. Circle the letter of the correct answer. The age of an object can be

determined in radiocarbon dating by comparing its carbon-14 levels with

a. carbon-14 levels in the atmosphere.b. carbon-12 levels in the atmosphere.c. carbon-12 levels in the object.

10. Circle the letter of each characteristic of radiocarbon dating.

a. Carbon-14 levels in the atmosphere can change over time.b. Carbon-14 levels in the atmosphere stay constant.c. Scientists often use objects of known age in radiocarbon dating.

11. Is the following sentence true or false? Radiocarbon dating is highlyaccurate in dating objects that are more than 50,000 years old.

Name ___________________________ Class ___________________ Date _____________

Chapter 10 Nuclear Chemistry©

118 Physical Science Reading and Study Workbook Level B ■ Chapter 10

IPLS

0113_hsps09_GRSW_Ch10.qxd 7/27/07 3:29 PM Page 118

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