Dr. Law explained that when you see the symbol "h" with a sigma, it means there is a rotational axis followed by a reflection perpendicular to that axis. For example, an S2 operation is equivalent to inversion, which means it is a C2 rotation followed by a mirror reflection. On the other hand, an S1 operation is simply a 360-degree rotation followed by a reflection, which is just a reflection. It is important to recognize when a seemingly complicated operation is actually a simpler operation in disguise. Next time, we will describe the SN operations using a real molecular example of staggered ethane. Stay tuned!

Using a difractometer and an x-ray source having a wavelength of 1.54 A degree one peak is observed for first order reflection from an FCC material when 2theta is 121 degree. What are the indices of this reflection? What is the interplanar distance? Show transcribed image text Using a difractometer and an x-ray source having a wavelength of 1.54 A degree one peak is observed for first order reflection from an FCC material when 2theta is 121 degree. What are the indices of this reflection? What is the interplanar distance?

Answer the following questions:

1. Describe the experiments that need to be done in order to determine the LD50 and what a chart would look like (sketch this out and label axes and important points)

1. An LD50 value is the best measure available to indicate the potential for a compound to cause harm, to be toxic. However, there are six limitations that we looked at and explained. Below, using your own words, name each of these limitations and explain in detail (and with an example/scenario if possible) why it’s a limitation.

CP2: Human Population Growth

[Student Name]    [Class Block/Period]

Student Work: Making Connections

Student Work: Interpreting Population Pyramids

Self-Assessment: Making Connections and Inferences

Level

Rationale - Write a short paragraph justifying the numerical level score you chose using key terms from the rubric and examples from your work.

Self-Assessment: Interpreting Data/Info to Make Valid Claims

Level

Rationale - Write a short paragraph justifying the numerical level score you chose using key terms from the rubric and examples from your work.

Checkpoint Directions

Check for Resources and Activities under this checkpoint that will help you complete this checkpoint.

Write a connection between human population growth for each of the 5 environmental issues identified by GIN.  There should be a clear cause and effect relationship identified for each.

Complete the activity in class, Power of Populations.

Choose a selection of population pyramids, global population graphs, and/or the demographic transition graph.  Analyze each and then explain the connections between them.