Homework for 10/20

1) Read Chpt 12
2) pg. 406 #1-5, pg. 412 #1-3

Homework for 10/16

1) pg. 118 #3-4, 6, 8, 10-13, 17-19-21, 25-27
2) HW Drop in M, W & F-today
3) Chapter 11 & 4 Test Friday
4) Last day for all HW from Chpt 11 & 4 DUE FRIDAY!
5) Make sure all labs are completed in composition books, all lab questions are posted online!

Study guide for Chapter 11 & 4 Test

Here are the topics to know for the test for Chapter 11 & 4 that will be on Friday.

Chapter 11:

• what is electromagnetic radiation
• know the different types of electromagnetic radiation and what is the wavelength and amount of energy for the different types
• know what wavelength means in regards to a wave
• understand that light has a dual nature as both a wave and a packet of energy called a photon
• understand what occurs when an electron absorbs a photon and what occurs when the electron gives off the photon
• know the difference between ground state and excited state
• understand why there are different colors of photons that we observe when atoms are excited

• understand the difference between an orbit and a orbital
• know the 4 principal energy levels and the sublevels of s, p, d and f
• know how many electrons are held in each of the sublevels
• know how to determine the electron configuration (1s2 and so forth) of an atom
• know the shapes of s, p and d orbitals
•  

• know what a valence electron is and its role in determining an atom's properties
• know how atom size changes on the periodic table
• know how the ionization energy changes across a periodic table

Chapter 4:

• know how to name compounds in three different ways
• when the first element is a metal and the second element is a nonmetal
• when the first element is a transition metal and the second element is a nonmetal
• when both of the elements are nonmetals
• know how to name compounds that contain  polyatomic ions
• know how to determine the formula by knowing the name of the compound (reverse of knowing the formula!)

Homework for 10/14

Note that this homework is due on Tues. Oct. 14th not on Monday.

pg. 108 #1-6, pg. 111 #a-g, pg. 112 #a-f, pg. 115 #a-e

Spectroscopy Lab Questions

Spectroscopy Lab

Objective: To identify the elements shown via their emission spectrum using a spectrograph.  To use the spectrograph, hold the small slit to your eye and view the lighted gas tube directly through the viewfinder.  Then look to your left to view the emission spectrum for that element.  In your composition book make a drawing of the colors that you see and their approximate distance from each other.

Pre-Lab Questions:

1. How does an atom become excited? What happens when the electron returns to ground state?

2. How are we able to identify different elements from distant stars?

Spectroscopy drawings:

3. Element #1:

4. Element #2:

5. Element #3:

6. Element #4:

Element identification:

8. Identify the elements by looking at the emission spectrum samples at your table.

Element #1: _______________              Element #2: _______________

Element #3: _______________              Element #4: _______________

9. Examine the sample emission spectrum from a nebula (a cloud of gas that will become a star). Using your spectrums that you identified, determine what elements are found in the nebula.

Questions:

10. How is spectroscopy useful when examining a star or planet, especially when we are unable to actually visit it?

11. Look at the elements that were found in the nebula, then look at the periodic table. Are there any similarities about these elements?

Homework due Thur 10/9

1) Read Chapter 4
2) pg. 97 practice 4.1 a-c, pg. 102 practice 4.3 a-e, pg. 104 practice 4.4 a-c, pg. 105 practice 4.5 a-c, pg. 107 practice 4.6  a-f

Homework due Tues. 10/7

1) pg. 394 # 48-50, 53-57

remember after school, homework drop in to help understand homework and get a head start. plus some extra credit.