Chemistry Brooks 1st

Remember tomorrow we go to Mrs. Kennedy's Room since the Sophomores will be taking a test.

• Today we worked on and finished the lab from last week. 
• Test FRIDAY!!!!!!!!

Bring Book Tomorrow:
Finish worksheet on Atomic Mass. Due at the beginning of class on Tuesday. I have given your tutorial teacher your Chapter 4 review. You will be given this sheet Tuesday in class. I have given it to you early so that you can have extra time to complete it.

HOMEWORK EXPLANATION:

1. Finding the Relative Abundance:

          Change the Percent Abundance to relative abundance (get rid of the percent) 

          Move the decimal two places to the left for each isotope

2. Finding the Atomic Mass: 

          Multiply the exact mass by the relative abundance and write it on the line.

          Do that for all three isotopes (28, 29, 30)

3. Finding the Average Atomic Mass: 

          Add all three relative abundances together

4. Finding the Element: 

         Look at your periodic table and look for the average atomic mass that you got

         Once you find the element then write down the atomic number

REMEMBER you if do not turn in your homework, you can not make it up later.
YOU are only allowed to redo assignments if you did them the first time. You are not allowed to make up assignments that you did not turn in the first time when they were do. You may be given extra time only if you ask myself or Mr. Brooks.

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