1. AP Chemistry Due Next Class:
Work on Haterade Lab (Analysis of Food Dyes in Beverages Lab)
Upcoming Due Dates:
Ch. 6 MC AF 10/19
Ch. 7 MC 10/24 CH. 7 MC AF 10/26
Ch. 5-7 Test 10/25
Haterade Lab 10/30

2. Warm up- Mose missed from MC
The laser pointer emits light because electrons in the material are excited (by a battery) from their ground state to an upper excited state. When the electrons return to the ground state, they lose the excess energy in the form of 542-nm photons. What is the energy gap between the ground state and excited state in the laser material?
& 6.26

3. Warm up- MosT missed from MC
The rays of the Sun that cause tanning and burning are in the ultraviolet portion of the electromagnetic spectrum. These rays are categorized by wavelength: So-called UV-A radiation has wavelengths in the range of nm, whereas UV-B radiation has wavelengths in the range of nm.
Calculate the frequency of light that has a wavelength of 330 nm.
Calculate the energy of a mole of 330 − nm photons.
Which are more energetic, photons of UV-A radiation or photons of UV-B radiation?
The UV-B radiation from the Sun is considered a greater cause of sunburn in humans than is UV-A radiation. Is this observation consistent with your answer to part (c) ?
& 6.26

4. Reflection Paper Partner up and read one another’s paper.
On a scale of 1-5; Did reading theirs help? Do you understand it better?
1- Didn’t help at all, actually made my understand worse
3- Helped some but I don’t feel like I have changed my understanding at all
5- Helped a bunch, deepened understanding
Share out best points!
Highlight the best point on their paper!

5. Ms. Bryce = Section 7.5

6. MEMORIZE THIS!!!!!

7. Metal, Nonmetals, and Metalloids

8. Metals Differ from Nonmetals
Metals tend to form cations.
Nonmetals tend to form anions.

9. Most of the elements in nature are metals. Properties of metals:
Shiny luster
Conduct heat and electricity
Malleable and ductile
Solids at room temperature (except mercury)
Low ionization energies/form cations easily

10. Metal Chemistry
Compounds formed between metals and nonmetals tend to be ionic.
Metal oxides tend to be basic.

11. Nonmetals
Nonmetals are found on the right hand side of the periodic table.
Properties of nonmetals include the following:
Solid, liquid, or gas (depends on element)
Solids are dull, brittle, poor conductors
Large negative electronegativity/form anions readily

12. Nonmetal Chemistry
Substances containing only nonmetals are molecular compounds.
Most nonmetal oxides are acidic.

13. Metalloids
Metalloids have some characteristics of metals and some of nonmetals.
Several metalloids are electrical semiconductors (computer chips).

14. Pre-lab Review

15. Lab Requirements IN LAB NOTEBOOK!
Objective
Materials (instruments and chemicals)
Prelab questions (with calculations)
Data Table (%T, C, H2O mL, stock mL)
Graph of %T (or Absorbance) vs. Concentration with y=mx+b
Graph of Optimum Linear Graph
Procedure for determining unknown
Calculations for unknown (M & mg/L)
Review Questions1-3
Sources of Error AND effects on data
Science Time!
Computer is just for reading, recording is done in your lab notebook
Remember proper cuvette use!
Graphs are all hand written!
Waste Down the Drain 