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collaborative/cooperative learning

Mary Saecker's picture

JCE 91.12—December 2014 Issue Highlights

Wed, 12/17/2014 - 13:50 -- Mary Saecker
Journal of Chemical Education December 2015

Celebrating the International Year of Crystallography
The December 2014 issue of the Journal of Chemical Education is now available for subscribers online at http://pubs.acs.org/toc/jceda8/91/12. The December issue includes content on: crystallography, assessment, career development for undergraduates, problem solving in organic chemistry, and teaching physical chemistry. This latest issue of JCE plus the content of all past issues, volumes 1 through 91, are available at http://pubs.acs.org/jchemeduc.

DAVID LICATA's picture

Stoichiometry is Easy

Sun, 11/16/2014 - 20:30 -- DAVID LICATA
Keep Calm Stoichiometry is Easy

This article describes a three week lesson plan for teaching stoichiometry using an algorithmic method. Two labs (one designed as a laboratory quiz) several cooperative learning exercises, student worksheets and guided instructional frameworks (forcing students to develop good habits in writing measures and doing problem solving) are included. The highlight of the lessons is the "chemistry carol" (based on Felix Mendelssohn's music for "Hark! The Herald Angels Sing") in which students recite a five-step algorithm for completing stoichiometry problems. While algorithmic processes may not always be best, I have found that there are many benefits to giving students a firm background and something to always fall back upon in one of the more challenging topics of chemistry. I believe that the good habits developed in this method of stoichiometry carry through to all the rest of their chemistry work, making it much easier to use inquiry-based methods when doing other advanced chemistry topics.

DAVID LICATA's picture

Writing Conversion Factors

Sat, 11/15/2014 - 23:01 -- DAVID LICATA
Writing Conversion Factors Preview

This worksheet is intended to be used as a "Guided Instructional Activity" (GIA). Students read a statement that gives a either a conversion factor or a pair of related measures and then write the information as two equivalent fractions ("conversion factors") and as an equality. In each representation, students are directed to give the numeral of the measure, unit, and identity of the chemical.

Time required: 

35 to 45 minutes.

DAVID LICATA's picture

Stoichiometry Guided Instructional Activities with Guide Framework

Sat, 11/08/2014 - 21:40 -- DAVID LICATA
Initial framework for use with stoichiometry GIAs

This set of three worksheets are intended to be used as collaborative "Guided Instructional Activities" (GIAs). Two students cooperate to complete the steps of a stoichiometry problem, alternately doing parts of the process as they explain what they are doing and evaluate their partner's work. These worksheets emphasize an algorothmic approach that helps students learn to think aobut the purpose of a question, organize their work, set it up so that it is easily readable and can be followed by others, and make good use of "unit analysis" (dimensional analysis).

Time required: 

Each of the activity worksheets requires 40 to 55 minutes.

DAVID LICATA's picture

Mole Conversion Guided Instructional Activities

Fri, 11/07/2014 - 23:37 -- DAVID LICATA
Mole Converstion Guided Instructional Activity Preview

The three "Guided Instructional Activities" in this activity are three cooperative learning pieces in which students are guided through the process of converting from one unit to moles (or moles to a unit) by the method of "unit analysis" (dimensional analysis). Students alternate steps in the process and evaluate the success of each step. They must do things such as writing the given information correctly, finding the correct molar mass, setting up the mathematics correctly, and determining the answer to a required number of significant figures.

Time required: 

Each of the activities requires about 40 to 55 minutes. The first one used usually takes longer, the last goes quicker.

DAVID LICATA's picture

Finding and Writing the Molar Mass of Elements [corrected]

Tue, 11/04/2014 - 20:09 -- DAVID LICATA
Finding and Writing Molar Mass Screenshot

This worksheet is intended to be used as a "Guided Instructional Activity" (GIA). It asks students to find the molar mass of selected elements and write the molar mass as two equivalent fractions ("conversion factors") and as an equality. In each representation, students are forced to give the numeral of the measure, unit, and identity of the chemical.

Time required: 

About 45 minutes.

DAVID LICATA's picture

Stoichiometry Fireworks Lab Quiz

Mon, 11/03/2014 - 21:39 -- DAVID LICATA
Ignition of sugar and potassium chlorate produces purple flames and sparks.

Given the amount of one reactant, students must use stoichiometry to find the ideal amount of the second reagent to use to create purple fireworks. The teacher ignites each groups' fireworks. Ideal mixture create little or no ash. Student assignment sheet with directions (and different initial amounts) plus teacher information and sample answers are included. This is an exciting and engaging activity that can be used as a stoichiometry quiz.

Time required: 

With one balance per table (two groups), the calculations should take about 10 minutes, the measures another 10 minutes. Ideally, students should be prepared to deliver their mixture to the teacher within 20 minutes. In practice, many students will take longer, particularly if the formula for potassium chlorate is not given and students are not familiar enough with ionic nomenclature.

The teacher will need about one minute per group to announce the group's mixture, ignite it, and wait for student responses. So if there are 15 groups, the teacher should allow about 15 minutes to ignite all the mixtures.

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