Observing a Chemical Reaction (NGSS Modified)
This is a Chemical Reactions lab that I modified to meet NGSS guidelines.
This is a Chemical Reactions lab that I modified to meet NGSS guidelines.
"Mr. T, you should do a review session for us before our final exam using a Google Hangout."
Cellulose nitrate (also known as nitrocellulose or guncotton) is a very flammable substance that is formed by reacting cellulose (also known as dietary fiber) with a mixture of concentrated nitric and sulfuric acids:
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.
In this post I would like us to consider the ways teachers can help support and scaffold the process of making claims and drawing conclusions on the basis of evidence. Not only is this grounded in the scientific practices addressed in the Next Generation Science Standard
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.
Hi everyone, I’ve spent much of my time over the past 10 years since moving from high school to college chemistry teaching thinking about whether I made the right choice in doing so.
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