This book is for chemistry teachers who are thinking about reinventing their laboratory experiments that they provide to their students. More than a collection of experiments, it is an example of using a chemical theme to teach chemistry. Instead of introducing many different chemicals per experiment as is the norm in most lab manuals, this novel resource focuses on two commonly found elements: Zinc and Iodine.
So what is so special about these elements? At the heart of this resource is a colorful cyclic reaction between zinc and iodine, one that produces a compound that can decompose back to its original elements. This unique phenomenon demonstrates that matter not only changes, but is also conserved through a chemical reaction. Knowing that a compound can be the "same but different" than the reactants that formed it, is to understand the essence of chemical change.
Complementing this reaction, this book contains experimental activities that utilize the zinc and iodine theme to scaffold new concepts such as the properties of matter, solid and gas stoichiometry, equilibrium, kinetics, acid-base chemistry, and electrochemistry. This teacher tested resource focuses on a set of safe substances that are appropriate for high school teachers who provide an advanced chemistry placement course and for college instructors teaching a first-year chemistry laboratory sequence.
|Product dimensions:||6.14(w) x 9.21(h) x 0.56(d)|
About the Author
Table of Contents
• Thematic-based Laboratory Curricula
• Working like a Scientist
• Cognitive Learning Theory and Thematic Curricula
• The Uniqueness of Zinc, Iodine and Zinc Iodide
• The Versatility of a Chemical Theme
• Introducing the Chemical Activities
1 From a Mixture to an Element
• How can I make a pharmaceutical product from seaweed?
• Can a single substance be isolated from a mixture
(e.g. seaweed)? What is this substance?
2 Physical Properties of Zinc
• How well does the appearance and solubility, of iodine and zinc respectively compare with information
presented in the CRC Handbook of Chemistry and
• What is the graphical (graph shape), mathematical (equation of the graph) and numerical (value of
slope and y-intercept) relationship between the mass
of a piece of zinc and the volume of space it occupies?
3 Synthesizing a Compound
from its Elements:
A Qualitative Experiment
• What happens qualitatively on both the macroscopic
and atomic levels when zinc, iodine and acidified water are mixed? Does a reaction occur?
• If a reaction does take place, are the physical and
chemical properties of the substances, isolated during and after the mixing, the same as or different
from those of iodine and zinc? Explain using your
reaction as an example.
• What are the identities of the three substances that
• Is there a way to put energy into zinc iodide in order
to regain the elements, zinc and iodine? If there is a
way, how does it happen?
• What are the identities of the substances found after
electrolysis and heating?
4 Synthesizing a Compound from
its Elements: A Quantitative
• Is mass conserved in the chemical reaction between
zinc and iodine?
5 Investigating a Side Reaction
• When acidified water is not used in the zinc and iodine synthesis, zinc hydroxide is formed. How can it
be identified based on its amphoteric nature?
6 An Alternative Synthesis
• Should chemists prepare zinc iodide, from its elements or from a double replacement reaction between barium iodide and zinc sulfate? (Compare the
two reactions in terms of yield, ease, purity, safety,
reaction time, waste production, and cost.)
7 Performing a Titration to
Quantify a Product
• What is the percent zinc of zinc iodide as deter-
mined by a titrimetric analysis?
• What is the percent zinc of an unknown zinc com-
pound as determined by a titrimetric analysis?