Answers to Check your understanding

When you have done the initial reading and attempted to answer the Active Reading questions, you are ready for class. In class your teacher will help you to better understand these ideas. Then you will work with your classmates on the Team Learning Worksheets, teaching and learning from each other. The Team Learning Worksheets enable you to check your understanding with the help of other members of your class. 

Self-tests Every Example has a Self-test, with the answer provided, so that you can check whether you have understood the procedure. There are also freestanding Self-tests where we thought it a good idea to provide a question for you to check your understanding. Think of Self-tests as in-chapter Exercises designed to help you to monitor your progress. 

Attempt all homework problems without peeking at the answers. As a last step read the assigned sections of the textbook to check your understanding of the ChemActivity you just completed. 

This four-step problemsolving method helps you understand what you are being asked to solve, to plan how you will solve each problem, to work your way through the solution, and to check your answers. This method is introduced in Chapter 3 and reinforced throughout the book. 

Discussion section in which we might talk about common pitfalls that you should avoid or how the problem we ve just done relates to other ideas we ve already explored. Finally, each example problem closes with a Check Your Understanding question or problem, which gives you a chance to practice the skills illustrated in the example or to extend them slightly. Answers to these Check Your Understanding questions appear in Appendix J. 

At the end of each chapter, you will find several study aids that complete the chapter. Chapter Reviews provide a summary and Concept Maps show the connections between important topics. The Key Terms, which are in boldface type within the chapter, are listed with their definitions. Understanding the Concepts, a set of questions that use art and models, helps you visualize concepts. Additional Questions and Problems and Challenge Problems provide additional exercises to test your understanding of the topics in the chapter. The problems are paired, which means that each of the odd-numbered problems is matched to the following even-numbered problem. The answers to all the Study Checks, as well as the answers to all the odd-numbered problems are provided at the end of the chapter. If the answers provided match your answers, you most likely understand the topic if not, you need to study the section again. 

This chapter reviews fractions and decimals and how to order real numbers. Fractions and decimals are the most common ways that numbers are represented. An understanding of these representations, and how to perform operations on these types of numbers is essential to your success at math. Before you study the lessons in this chapter, take a few minutes to take the following ten-question Benchmark Quiz. These questions are similar to the type of questions that you will find on important tests. When you are finished, check the answer key carefully to assess your results. The quiz will help you assess your prior knowledge of fractions and decimals. You may find that you are successful with one type and need additional help with another. You can then proceed to the lessons with focus. 

As you piece together answers to the preceding questions, check a newspaper s help-wanted section or go online and find five or more ads for positions that are similar to the one for which you re applying. Study the wording of these ads and choose keywords that you can incorporate into your resume to describe job titles, responsibilities, experience, etc. If you understand exactly what the employer needs, your goal is to explain, using your resume, how your experience makes you qualified to meet the responsibilities of the job. 

When you are ready to start, cover the first page with a card and pull it down to expose the first frame. Read and act on that frame and then expose frame 2, and so on. Remember to write down the answers to the questions — they are for you to check on your own progress and it is often only when you commit yourself to paper that you find out whether you really understand what you are d oing. 

The units start with a list of aims from which you can check your previous or prior knowledge. This is followed by a self-diagnostic test to check the level of understanding. The answers are given later in the text as a check. You should obtain at least 80% on this test to be certain of understanding the material. If the check shows that there is a deficiency in understanding then the work tasks in the unit can be undertaken in detail. 

At the beginning of a course or of j ust one session, write a learning journal entry about what you expect and hope to get out of it, in particular noting any questions that you hope the course or session may answer. Write in sentence form rather than notes. At the end of the course or session go back to this piece of writing to check how your understanding has increased and whether your expectations have been met. 

Several problems in this chapter ask you to suggest ways to carry out conversions of one molecule into another. We always give one possible answer and sometimes comment on alternatives but you should realize that there are usually many possible right answers to questions of this sort. Make sure you understand the principle behind the question and, if your answer is very different from ours, check with someone with experience of synthesis. 

This type of question addresses your conceptual understanding, so we need a qualitative approach to check the answer. One strategy is to ask what would happen if you answered the question the opposite way. If we said equilibrium moved to the right in part (a) for example, what would that imply It would say we have much more gas present, and more gas would increase pressure. Because the problem initially indicated an increase in pressure, this result would not oppose the applied change—so the opposite direction of our answer is clearly wrong, and our answer must make sense. 

Even more important is what you do when you do not get the correct answer to a problem. You will be tempted to return to the examples and Target Checks, find one that matches your problem, and then solve the assigned problem step by step as in the example. You should resist this temptation. If you get stuck on a problem, it means you did not truly learn from the earlier examples. Leave the problem. Turn back to the example. Study it again, by itself, until you understand it thoroughly. Then return to the assigned problem with a fresh start and work on it to the end without further reference to the example. Einally, work the remainder of the problems in the group until you are confident that you can solve this problem type. 

Solving a problem with one finger at its solution in the answer section so you can check your progress is neither solving the problem nor learning how to solve it. When you tackle a problem, solve it completely. If you get stuck at any point, put the problem aside and check the part of the chapter that covers that point. Learn there what you need to learn. Do not check the answer section. Return to your solution of the problem and complete it. Then compare your solution to the one in the back of the book. If they do not agree, find out why. Be sure you understand the problem before going to the next one. 

CHECK FOR UNDERSTANDING Apply Would testing a new dmg to find if it is an effective treatment for a disease be considered basic research or applied research Explain your answer. 

CHECK FOR UNDERSTANDING Explain An antacid tablet is dropped into a glass of water and dissolves. The tablet fizzes, and bubbles of gas rise to the surface. Is this a physical change or a chemical change Explain your answer. 

Remember not to spend too long on questions you don t understand. Mark them (in your test booklet, not your answer sheet) so you can come back if there s time. Check periodically (every five to ten ques-... 

---