Mass of a Reaction Product

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.

Simple Activities to Integrate Particle-Level Diagrams

There have been many conversations within the Chemistry Education community surrounding the revisions to the AP curriculum. Twitter has been buzzing with instructors debating how to implement the changes, conferences and workshops have participants deconstructing the data from last year’s exam, and classroom teachers are working diligently to prepare their students for this year’s test. One way the College Board has tried to shift the AP curriculum away from algorithmic problem solving and toward more meaningful conceptual understanding is through the use of particle diagrams.

Eavesdropping on Professional Chemists

My husband and I are both chemists, but in very different capacities.  My focus is teaching while he is a lab supervisor.  As such, we have very different discussions when we meet with colleagues.  Usually.  A few weeks ago we attended a meeting together and I felt right at home.  The discussion topic was lab audits.  This is when fellow chemists enter a different lab and make sure that everyon

Chemistry Topics

acids/bases applications of chemistry aqueous solution chemistry Atomic Properties / Structure conductivity consumer chemistry Demonstrations density electrochemistry electrolysis equilibrium gases General Chemistry Intermolecular Forces kinetics Laboratory Instruction liquids metals noncovalent interactions Outreach oxidation/reduction Oxidation / Reduction Phases / Phase Transitions / Diagrams Physical Chemistry physical properties Polymer Chemistry precipitation/solubility Public Understanding reactions solids stoichiometry thermodynamics