Description: This lesson looks at how the Bohr model explains absorption and emission spectra. The concept of electron energy level transitions is introduced along with the way that the Bohr model of the atom accounts for absorption spectra and emission spectra for atoms.
Description: This lesson looks at the basics of atomic structure. Students will learn how to use the periodic table to identify numbers of electrons, protons and neutrons for an atom. The term "isotope" is introduced and we compare different isotopes of elements and learn to represent isotopes through hyphen and nuclear notations.
Description: The work of Ernest Rutherford in the famous Gold Foil experiment provided further evidence of the true structure of an atom. It turned out that the plum pudding model wasn't quite right either. Rutherford's work provided solid evidence that atoms have a nucleus.
Description: We look at JJ Thomson's famous experiment with the cathode ray tube and the implications for the atomic model of the experimental results. We end by showing Thomson's plum pudding model of the atom.
Description: This lesson introduces Unit 3 - The Atom Theory. The contributions of Greek Philosopher Democritus are discussed. We then fast-forward to John Dalton who gathered the evidence to support the first Atomic Theory. Dalton's Law (Law of Multiple Proportions) is introduced and presented as the major piece of evidence supporting the atomic theory.
Description: This lesson introduces the concepts of accuracy and precision of measurements. Students will evaluate groups of measurements to determine if they are accurate, precise, both, or neither. The video concludes by demonstrating how to calculate the % Error of an experimental result to indicate the accuracy of the result.
READING ASSIGNMENT: Chapter 2, Section 7, beginning on page 51.
Description: This lesson reviews basic algebra involved in rearranging an equation to "solve" for an unknown variable. Students are then introduced to the dimensional analysis approach to conversion of units.
READING ASSIGNMENT: Chapter 2, Section 5, starting on page 44.
Description: Measurements have uncertainty. Calculated values involving measurements need to reflect the uncertainty in the measurement. Students will learn the rules for rounding to the proper place when performing calculations with measurements.
READING ASSIGNMENT: Chapter 2, Section 4, pages 41-44.
Description: Measured values always contain a degree of uncertainty. Significant digits reflect the degree of uncertainty in measurements. Students will learn how to obtain the appropriate amount of digits when making a measurement and how to report the correct number of digits in a calculated answer based on the significant digits in the measurement(s) used in the calculation.
Description: We review how to use scientific notation including: converting standard numbers to scientific notation, converting scientific notation measurements to standard numbers, and dealing with scientific notation in conversions and other calculations.
READING ASSIGNMENT - SECTION 2.6, pages 47-50 in text.
Description: Qualitative and quantitative observations are reviewed. Students will learn to distinguish between these types of observations and practice making some observation of both types.
READING ASSIGNMENT: Chapter 2, section 1, starting on page 23 of text.
Description: Scientific Laws and Theories are defined, compared and contrasted. Examples of both theories and laws relevant to chemistry are discussed.
READING ASSIGNMENT: Read pages 8-9 in chapter 1 of text.
Description: We go through the steps of the scientific method and the elements of a controlled experiment. We conclude by looking at the uses and limitations of models in science.
READING ASSIGNMENT - Chapter 1, section 2, beginning on page 5.
Description: Students are introduced to the science of chemistry. We discuss what chemists "do" and what sort of impact chemical science has on our lives. We also discuss the origins of chemistry as a branch of science as well as some of the areas of study within chemistry.
READING ASSIGNMENT - Chapter 1, section 1.1, pages 1-4.