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JCE ChemEd Xchange provides a place for sharing information and opinions. Currently, articles, blogs and reading lists from ChemEd X contributors are listed below. We plan to include other items that the community wishes to share through their contributions to ChemEd X.

DAVID LICATA's picture

Mole Conversions: 1- & 2-step with format

Wed, 11/05/2014 - 19:52 -- DAVID LICATA
Screenshot of a portion of the worksheet

This worksheet asks students to do basic conversions of mass or molecules to moles and vice versa. The worksheet requires students to complete their work in a particular format and to inlcude number, unit, and chemical identity for each item in the "given," in each conversion factor, and in the answer. It gives students basic practice in this mathematical exercise while inforcing good habits that encourage "unit analysis" (or dimensional analysis).

Time required: 

This worksheet can be used as an in-class or as a homework assignment. The ten items on the first page should take 20 to 30 minutes. The ten items on the second page should take 30 to 50 minutes.

Hal Harris's picture

"What If? Serious Scientific Answers to Absurd Hypothetical Questions" by Randall Munroe

Wed, 11/05/2014 - 15:52 -- Hal Harris

xkcd is a nerdy Internet daily cartoon that is written and drawn by a former NASA "roboticist". The subject matter is all over the map [yesterday's (11/4/14) is about TypographicChemistry], but tends to favor physics and computing. He encourages readers of the cartoon strip to send him outrageous questions, and he supplies outrageous but scientifically accurate responses. Some of the best of these have be come a surprising NYT Best Seller.

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.

DAVID LICATA's picture

Mass of a Reaction Product

Wed, 10/29/2014 - 21:41 -- DAVID LICATA
Sodium carbonate reacts with hydrochloric acid producing bubbles

Students combine sodium carbonate and hydrochloric acid generating carbon dioxide gas which is allowed to escape. They measure the actual yield of carbon dioxide produced (missing mass), calculate the theoretical yield using stoichiometry, and then the percent yield. Students understand that 100% yield is the most appropriate answer (based on the Law of Conservation of Mass), so after considering the meaning of significant figures and the uncertainty of their measurements they are asked to decide if they did (or did not) get an answer that might indicate the validity of the Law.

Time required: 

One 50-minute period to perform the lab. One additional period to perform the calculations (optional). Often more able students will have time to begin some calculations at the end of the lab experiment.

Mary Saecker's picture

JCE 91.10—October 2014 Issue Highlights

Tue, 10/28/2014 - 13:58 -- Mary Saecker
Journal of Chemical Education October 2014 Cover

Communicating the Value of Chemistry
The October 2014 issue of the Journal of Chemical Education is available online to subscribers [http://pubs.acs.org/toc/jceda8/91/10]. The October issue features sustainability; celebrating National Chemistry Week 2014 with articles on food and candy; increasing chemistry understanding for the nonscientist; nanochemistry; investigating materials: plastic & paper; exploring sound; research on chemical equilibrium instruction and student understanding of scale.

Mary Saecker's picture

JCE 91.09—September 2014 Issue Highlights

Tue, 10/28/2014 - 13:39 -- Mary Saecker
Journal of Chemical Education September 2014 Cover

Advanced Placement Chemistry Special Issue
The September 2014 issue of the Journal of Chemical Education is available online to subscribers [http://pubs.acs.org/toc/jceda8/91/9]. The September issue features a special issue of 20 contributions on Advanced Placement (AP) Chemistry as well as many other articles to help students learn chemistry.

Deanna Cullen's picture

Photoelectron Spectroscopy Special Issue Article

Mon, 10/27/2014 - 17:58 -- Deanna Cullen

The new AP Chemistry curriculum is in the second year of use. Photoelectron spectroscopy (PES) is a topic that generated much discussion because it is an addition to the curriculum. Jamie Benigna of Michigan teaches AP Chemistry, is an AP reader and recently wrote an article about PES for the Journal of Chemistry Education Special Issue. The article discusses the rationale for including PES in the course, explains some background of PES and provides strategies for including PES in your own course. This article is offered as a free preview of the AP Special Issue. 

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