CHEM-C 127 Study Guide - Summer 2018, Comprehensive Midterm Notes - Graph Of A Function, Zinc, Wavelength
CHEM-C 127
MIDTERM EXAM
STUDY GUIDE
Fall 2018
Introduction to graphing:
Graphing data provides a way to visualize data
• makes it easier to interpret data
• easy way to present information to the public.
o simplifies interpreting data
o making conclusions from the experiment
o for both the researcher and the audience.
• When data is only presented as tabulated, relationships between variables are often
unclear.
• provides a way to determine whether or not a set of data is reliable.
• able to determine the line equation of the graph
o which can be taken further as a mathematical equation
• create multiple graphs with the same data
o determine which relationships are the most reliable
o data must be manipulated in different ways.
o comparing the line equation of the different graphs
▪ can determine which relationship is the most reliable.
▪ graph will have an R2 value either very close or equal to one.
All three of the graphs produced a linear relationship
• the graph that involved demonstrating the relationship between wavelength and the
inverse of frequency produced the most reliable relationship
find more resources at oneclass.com
find more resources at oneclass.com
o The R2 value was 1
o the other R2 values were very close to one
▪ they were not as reliable.
• the line equation from the wavelength vs. 1/ frequency graph
o solve for the wavelength of the color red
o sustituting the gien feuen alue in plae of the aiale
o soling fo the aiale , hih is fo the aelength.
• Both graphs that were produced were linear, and very similar
o R2 value for the graph of the relationship between the concentration and the log
of the ratio of Io Vs. I had value of 1
o making it the most reliable set of data.
o relationship between the concentration and the log of Io/I ratio had a directly
proportional relationship
o determine the concentration of a solution in mol/L from the Io/I ratio
▪ 4.5.
▪ plugging in . as the alue of the line euation
▪ y= .8303x-.0001
▪ sole fo the aiale
• will give us the concentration.
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Graphing data provides a way to visualize data: makes it easier to interpret data easy way to present information to the public, simplifies interpreting data, making conclusions from the experiment for both the researcher and the audience. Crystalline structures are characterized by a repeating arrangement of atoms. Lab lecture: crystalline structure: very commonly observed in atoms, ions, and molecules, understanding the structure of ions, atoms, and molecules can reveal a great deal about their physical properties. In the face centered cubic unit cell: each of the 8 corners contained 1/8 of an atom, each face of the cubic unit cell had half of an atom. there was a total of 4 atoms present. Involves plugging in the known values obtained for entropy and free energy at room temperature: ex) solving for the enthalpy in equation which was found to be -95. 654.
