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Laboratory Instruction

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 91.08—August 2014 Issue Highlights

Tue, 10/28/2014 - 13:18 -- Mary Saecker
Journal of Chemical Education August 2014 Cover

Using Models for Learning Chemistry
The August 2014 issue of the Journal of Chemical Education is now available online to subscribers at http://pubs.acs.org/toc/jceda8/91/8. The August issue contains content to spark thinking about models and how to foster meaningful learning in chemistry classrooms and improve student understanding.

Mary Saecker's picture

JCE 91.07—July 2014 Issue Highlights

Tue, 07/22/2014 - 12:47 -- Mary Saecker
Journal of Chemical Education July 2014 Cover

Passion for and Dedication to Chemistry and Education
The July 2014 issue of the Journal of Chemical Education is now available online to subscribers at http://pubs.acs.org/toc/jceda8/91/7. The July issue features a tribute to J. J. Lagowski, green chemistry principles, book recommendations for the summer, organic chemistry in action, computation chemistry experiments, resources for teaching fluorescence spectroscopy.

Erica Jacobsen's picture

Seeing Is Not Believing

Mon, 06/02/2014 - 16:35 -- Erica Jacobsen

“It sort of started to look kind of like a very pale blue.”

A friend who teaches at the middle school level told me about a science experiment he’d done with his students. The procedure suggested to students that a particular solution would turn blue, but also asked them to write down what they saw happen. The thing was, it wasn’t actually designed to turn blue.

Mary Saecker's picture

JCE 91.03—March 2014 Issue Highlights

Fri, 03/14/2014 - 14:36 -- Mary Saecker
Journal of Chemical Education March 2014 Cover

Teaching Chemistry and Making a Difference
The March 2014 issue of the Journal of Chemical Education is now available online to subscribers at http://pubs.acs.org/toc/jceda8/91/3. The March issue features: changing the curriculum to make connections, forensic chemistry, computer-based learning, hands-on activities and labs for introductory chemistry, teaching physical chemistry, organic and biochemistry labs, and the mole concept.

Mary Saecker's picture

JCE 91.01—Janauary 2014 Issue Highlights

Fri, 02/14/2014 - 10:57 -- Mary Saecker
Journal of Chemical Education January 2014 Cover

ACS Publications—Most Trusted. Most Cited. Most Read
The January 2014 issue marks the start of the 91st volume of the Journal of Chemical Education. This issue plus the content of all past volumes are available online to subscribers at http://pubs.acs.org/jchemeduc. The January 2014 issue will be available as a sample issue for the entire year, so the full text of all articles can be accessed without a subscription. Subscription information is available at http://pubs.acs.org/page/subscribe.html?ref=jceda8.

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