Chemistry!! March 7 & 8, 2013 Ms. Boon. Catalyst  What are the three types of radiation?  Nuclear power plants use ( fusion/fission ) to generate energy.

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Presentation transcript:

Chemistry!! March 7 & 8, 2013 Ms. Boon

Catalyst  What are the three types of radiation?  Nuclear power plants use ( fusion/fission ) to generate energy and the sun uses ( fusion/fission ) to generate energy.  Take out your HW!  Objective: I can write a nuclear reaction equation.  Agenda:  Catalyst  Nuclear Subs  Nuclear reaction equations  Exit Slip: Nuclear Chem.

Spotlight: Nuclear Submarine Video Focus Questions: 1. What is the mission of the US nuclear submarines? 2. What type of nuclear reaction powers the sub? How does this work? 3. Why does the Navy use nuclear subs rather than diesel fuel powered subs? Video: movies file – nuclear submarine

Notes: The nuclear strong force  The nuclear strong force holds protons and neutrons in stable nuclei together.  This force is stronger than chemical bonds.  Breaking or changing the nuclei during fission or fusion reactions releases some of the nuclear strong force energy.  Example: fission of 1 g of uranium-235 generates as much energy as the combustion of 2700 kg of coal.

Notes: The nuclear strong force  Example: fission of 1 g of uranium-235 generates as much energy as the combustion of 2700 kg of coal.

How much energy?  The energy released in a nuclear reaction is calculated using E=mc 2 E is energy (J) m is mass (kg) C is the speed of light 3.00 x 10 8 m/s Using this equation, converting 1.0 g of a substance into energy produces over KJ of heat energy.

Quick Check:  Which takes the most energy to occur: 1. physical, 2. chemical or 3. nuclear change

Quick Check:  What part of the atom is involved in nuclear reactions? 1. The nucleus 2. The electron cloud

How To Write a Nuclide Symbol: Mass number = protons + neutrons Think, Pair, Share: How many neutrons does this nuclide have?

How To Write a Nuclide Symbol: Compare the nuclide symbol to the periodic table symbol. Practice: Complete “B” Practice Writing Nuclides on your worksheet.

Radioactive decay equations: 1. Alpha (α) decay: The mass number decreases by 4 and the atomic number decreases by Po He Pb 82

Radioactive decay equations: 2. Beta (β) decay : The mass number remains the same. The atomic number increases by C e N 7

Radioactive decay equations: 3. Gamma (γ): Gamma rays are released during electron capture Cr + e + γ V 23

Homework Review  Read p , practice p. 653 # Po He Pb Pb Na + e Ne Ne Pm + Nd e 0 e Es + Hen Md Md 101

Practice  Complete the Practice Worksheets.  Raise your hand to check your answers and get a stamp when you are done.  If you finish early:  Do HW due today: 653 #1-4; Work on make up assignments, your study guide, challenge questions, or homework.  Tonight’s HW:  Nuclear Chemistry: Read Ch. 18 Section 2 (p ). Do problems p. 657 #1, 2, 5, 6  Benchmark #3 Review - acids and bases: Re-read Ch. 15 Section 1 (p ) Do problems p. 566 #1, 2, 8, 9, 10; p. 567 #25, 26, 36

Exit Slip: Nuclear Chemistry 1. What part of an atom is involved in nuclear reactions? 2. What are the three types of radioactive particles/waves? 3. What is the difference between fission and fusion? 4. Which produces more energy per gram of fuel: a nuclear reaction or a combustion (chemical) reaction? 5. Write the nuclear equation for the alpha decay of uranium-238.

Homework  Nuclear Chemistry: Read Ch. 18 Section 2 (p ). Do problems p. 657 #1, 2, 5, 6  Benchmark #3 Review - acids and bases: Re-read Ch. 15 Section 1 (p ) Do problems p. 566 #1, 2, 8, 9, 10; p. 567 #25, 26, 36

Announcements  Grades:  Pinnacle grades are up to date except for the Reaction rates/Equilibrium worksheets and the short answer portion of the exam.  All make up work is graded and entered in pinnacle  Make up work:  To get your work in before the 10 week grading period, the last day to turn in make up work is Friday March 15.  Tutoring:  Tutoring is Friday at 3:45.  BM 3 study guide:  Bring a folder to our next class to collect your worksheets, old exams, and study guide.