Launch: 9/30   Grab a handout, your binder, and immediately take

a seat

  Answer the following questions on binder paper: 1.  Was yesterday’s exam correction format helpful?

2.  If you had to take the exam again right now, what grade would you expect to get (A, B, C, D, or F)?

3.  What are some topics you are still confused about?

Unit #3: Nuclear Processes

Midterm Exam #1   Tentatively scheduled for Friday, October 16th

  Cumulative exam   Unit #1: Atomic Structure   Unit #2: The Periodic Table   Unit #3: Nuclear Processes

  I won’t settle for less than 80%

  You won’t settle for less than 80%

WE CAN DO BETTER!

What holds the nucleus together?

Mr. Heffner 9/29/09

Foldable   Terms:

  Strong force (a.k.a. nuclear force)   Electrostatic repulsion

  Nucleus   Proton (charge)   Neutron (charge)

  Atomic number   Atomic mass

Exit Slip 1.  Which of the following defines the unique

properties of an element? a.  the number of neutrons b.  the atomic mass c.  the number of protons d.  the number of protons and neutrons

2.  If element 114 were to be made, it would have a.  114 protons. b.  114 neutrons. c.  varying numbers of protons depending on the stable

configuration. d.  an atomic mass of 114.00

Exit Slip 3.  What holds the nucleus together?

a.  the strong force b.  the electrostatic forces between the protons

c.  the electrostatic forces between the protons and electrons

d.  the force of the electrons acting on the nucleus

4.  In a stable atom, a.  the number of protons = number of neutrons. b.  the electrostatic forces outweigh the nuclear forces. c.  the nuclear forces outweigh the electrostatic forces.

d.  the protons form rings with the electrons.

Exit Slip 5.  The most abundant isotope of lead contains 82

protons and 124 neutrons packed closely together in the nucleus. Why do protons stay together in the nucleus rather than fly apart?

a.  Electrons in neighboring atoms neutralize repulsive forces between protons.

b.  Neutrons effectively block the protons and keep them far apart to prevent repulsion.

c.  Electrostatic forces between neutrons and protons hold the nucleus together.

d.  Nuclear forces overcome repulsive forces between protons in the nucleus.

Homework   Read pg. 88 in textbook

  Write a 4 sentence summary about isotopes