Grade 11 Chemistry Blog: August 2014

Thursday, August 28, 2014

27th August, 2014

The class on wednesday was pretty good. We made some snazzy glow water at the start then went on to learn about why it glows and the electromagnetic spectrum. Mr. Carmichael also showed us how the periodic table knows everything and explained orbitals. Chemistry is fun.

- Victor

Monday, August 25, 2014

Class of August 25th - Atomic Structure

Class notes picked up on slide show 2.1 "The Nuclear Atom" from slide 10 upon which students were asked to complete the following table.

Throughout the slide show concepts such as isotopes, the workings of a mass spectrometer (device used to define the mass of atoms and compounds) were described. On slides 13 & 14 students were asked to answer the following question with the data provided below, "what is the RAM* of zirconium?"

*RAM - Relative atomic mass.

The question is answered by multiplying the "relative percentage of abundance" by the number of protons in the corresponding isotope. Once this has been done for all of the isotopes they may be added and then divided by 100 to find the RAM e.g.

((90*51.5)+(91*11.2)+(92*17.1)+(94*17.4)+(96*2.8))/100 = 91.318

The class then partook in a demonstration of how the RAM of an element is found in order to calculate the mass of different isotopes. This demonstration used coins in opaque containers. When the mass of the different coins is provided the following equation** could be used to calculate how many of each coin was in each canister.

**Hint: Let y = the number of 5p coins. Then let 10-y = the number of 1p coins.

Equation: Total Mass = [(y)*(mass of 5p coins)] + [(10-y)*(mass of 1p coins)]

Students were then asked to compose eight different atoms on the iPad app "Atomic Elements Carolina"

Homework:

"IB1 Chemistry Atomic Theory Study Guide Part 1" &

"IB Honors Chemistry Atomic Theory Study Guide Part 1"

Questions: 1-7 & 10, 11, 12, 14, 15, and 16.