Search

Presents laboratory experiments to demonstrate the pH properties of different buffer solutions. (YDS)

Laboratory activities for chemistry students focus attention on the use of acid-base chemistry to examine environmental conditions. After using standard laboratory procedures to analyze soil and rainwater samples, students use web-based resources to interpret their findings. Uses CBL probes and graphing calculators to gather and analyze data and notes connections to national science education standards. (DLH)

Presents a science experiment in which students test the buffering capacity of household products such as shampoo, hand lotion, fizzies candy, and cola. Lists the standards addressed in this experiment and gives an example of a student lab write-up. (YDS)

Presented are the teacher's guide and student materials for one of a series of self-instructional, computer-based learning modules for an introductory, undergraduate chemistry course. The student manual for this acid-base equilibria unit includes objectives, prerequisites, pretest, a discussion of equilibrium constants, and 20 problem sets. Included in the teacher's guide are implementation instructions, answers to problem sets, software, a listing of the computer program in BASIC, and 10 unit tests. (BT)

This book contains 112 classroom demonstrations intended to be used with any introductory chemistry program. These demonstrations were selected in an effort to provide simple, safe, effective and enjoyable experiences for the class. In addition, they are intended to be used to introduce many of the major concepts in chemistry. The demonstrations involve color changes, gas evolution, precipitate formation, smoke, fire, and other obvious or dramatic chemical changes. The guide is organized into 11 major sections including: (1) introducing chemistry; (2) physical changes; (3) reactions involving gases; (4) reactions of some elements; (5) transition metals and complex ions; (6) chemical bonding; (7) energy changes; (8) solutions and solubility; (9) kinetics and equilibrium; (10) acids and bases; and (11) oxidation and reduction reactions. Appendices include an equipment and reagent list and detailed safety and disposal instructions. (TW)

This book contains 108 classroom demonstrations intended to be used with any introductory chemistry program. These demonstrations were selected in an effort to provide simple, safe, effective and enjoyable experiences for the class. In addition, they are intended to be used to introduce many of the major concepts in chemistry. The demonstrations involve color changes, gas evolution, precipitate formation, smoke, fire, and other obvious or dramatic chemical changes. The guide is organized into 11 major sections including: (1) properties of atoms; (2) gases; (3) solubility and solutions; (4) acids and bases; (5) energy changes; (6) equilibrium; (7) kinetics; (8) oxidation-reduction; (9) electrochemistry; (10) smoke, fire, and explosions; and (11) other chemical reactions. Appendices include an equipment and reagent list and detailed safety and disposal instructions. (TW)

Presents a simple qualitative system for sketching all manner of acid-base titration curves, requiring only the approximate values of the acid or base ionization constants. (WRM)

Describes an open-ended activity in which students try to determine the factors that contribute to an unusual chemical reaction. Uses a case study approach to show students how the presence of chlorine in tap water can interfere with a pH indicator. Includes assessment guidelines and extension activities. (WRM)

Presents four activities that involve chemical reactions with vinegar, lemon juice, or orange juice. These activities can be used to teach about acid-base reactions and acids as chemical catalysts. (WRM)

This autoinstructional program deals with the study of the pH of given substances by using litmus and hydrion papers. It is a learning activity directed toward low achievers involved in the study of biology at the secondary school level. The time suggested for the unit is 25-30 minutes (plus additional time for further pH testing). The equipment needed is itemized. With the student script there is included a pH worksheet that can be used for recording the observations made and answering suggested questions relevant to observations made. (EB)

Presents a week-long unit of study that covers the concepts of acid base chemistry and involves students in a context in which that information is relevant. In this activity, students build a model swimming pool and must maintain the chemistry of their pool at safe levels. (DDR)

The Learning Cycle Strategy enables students themselves to construct discrete science concepts and includes an exploration phase, introduction phase, and application phase. This book focuses on the use of the Learning Cycle to teach physical sciences and is divided into three sections. Section I develops a rationale for the Learning Cycle as an effective way to teach science concepts. Section II includes six basic physical science concepts that are common to most middle school science curricula: Bernoulli's principle, acids and bases, properties of gases, expansion and contraction of gases, circuits, and density. Each Learning Cycle centers on a single concept or idea and includes a number of sequenced, hands-on activities. Section III provides an opportunity for teachers to develop their own Learning Cycle sequence and contains randomly sequenced activities related to the concept of surface tension. (JRH)

Presents the Ramsen demonstration, a chemical demonstration that involves the reaction between copper and concentrated nitric acid. Outlines Ira Ramsen's description of the experiment, a modified version of it, the interpretation, and applications. (JRH)

Describes two spreadsheets for producing acid-base titration curves, one uses relatively simple cell formulae that can be written into the spreadsheet by inexperienced students and the second uses more complex formulae that are best written by the teacher. (JRH)

Part of the Understanding Our Environment project that is designed to engage students in investigating specific environmental problems through concrete activities and direct experience, this unit uses the contemporary dilemma of acid rain as a vehicle for teaching weather and the characteristics of air and atmosphere. The project involves a hands-on activity in which students examine and compare mock rainwater samples from a fictional remote site in the United States. Information gathered and questions raised in the course of this activity are used to examine weather patterns and to discover how weather is a result of the atmosphere's structure and scale. As a follow-up, the global issues of stratospheric ozone depletion and greenhouse warming are introduced. The objectives include: learning about all aspects of the problem of acid precipitation; drawing inferences about how pollutants are transported through the atmosphere; appreciating the processes and characteristics of the atmosphere; understanding how weather is a function of atmospheric processes; investigating the role of airborne particles in cloud formation; and learning about smog, greenhouse warming, and ozone depletion. (JRH)

Describes acid-base titration experiments using the computer. (MKR)

Describes the history, chemistry, and uses of sulfuric acid. Presents demonstrations with this the cheapest bulk acid that is available in every country of the world. (PR)

Presents three typical lab activities involving the breathing rate of fish, the behavior of electromagnets, and tests for water hardness to demonstrate how labs can be modified to teach process skills. Discusses how basic concepts about experimentation are developed and ways of generating and improving science experiments. Includes a laboratory modification checklist. (MDH)

Demonstrates the possible confusion arising from the terms 'weak acid' and 'weakly acidic' in different contexts. Suggests some reasons and possible approaches for overcoming these confusions. (Author/ASK)

Discusses mathematical shortcuts that can be used to estimate the pH of most aqueous solutions. (WRM)

Describes how a classroom observation of apples led to the development of a science project. Discusses the correlation between the greenness and the acidity of apples. Finds that the greener the apple, the lower its pH, and thus the more acidic and less sweet it tastes. (Author/CCM)

Describes an activity that promotes analytical thinking and problem solving. Gives students experience with important scientific processes that can be generalized to other new laboratory experiences. Provides students with the opportunity to hypothesize answers, control variables by designing an experiment, and make logical deductions based on what they know and observe. (JRH)

Recommends an approach to the treatment of acid-base equilibria that involves treating each reaction as either going to completion or not occurring at all. Compares the method with the traditional approach step by step. (DDR)

Presents an experiment designed to show students that the Henderson-Hasselbalch equation will fail when they use this particular one-half titration technique for acids with large pKa's. Involves determining the apparent pKa for such acids and using that to calculate the true pKa. (JRH)

Describes an experiment designed to determine ascorbic acid concentrations in natural orange juice. The experiment is used with undergraduate pharmacy students to allow understanding of the principles of operation of the coulometer and polarograph. (DDR)

Describes classroom activities that involve student movement to demonstrate principles of kinetics. This classroom method can be used for any topic related to dynamic processes. The method used in this activity illustrates Brxnsted-Lowry acid-base theory and redox reactions. Takes advantage of analogies between proton and electron transfers. Use of motion reinforces other methods of learning chemistry. (PVD)

Presents an activity on chemical changes and experimentation with testing the roles of various reactants in accomplishing the changes. (Author/KHR)

Introduces a student activity that explains acid base reactions with a carbon dioxide reactant. Includes both instructor information and student activity sheet. (YDS)