1. Chapter 3 & 24 Jeopardy Review 3-33-424Work it 200 400 600 800 1000

2. 3-3 200 200 Name the three subatomic particles and give their charges. –Protons +, neutrons 0, electrons -

3. 3-3 400 400 How is the atomic mass calculated? Where is it written in the complete chemical symbol –Atomic mass = protons + neutrons –Written in the upper left hand side of the symbol

4. 3-3 600 600 What is the atomic number? How is it unique? Where are they written in the complete chemical symbol –The number of protons. –The atomic number (protons) identifies the element. –Lower left corner of the symbol

5. 3-3 800 800 Isotopes of the same element will have different numbers of ________ and therefore _____ _______? How is the charge of an ion calculated? Where is it written in the complete chemical symbol –Neutron and mass numbers –P-e. Upper right corner of symbol

6. 3-3 1000 1000 Why do elements on the PT have mass numbers with decimals? Give the formula to calculate the average atomic mass –The masses are weighted averages of that elements isotopes –(M 1 x %/100) + (M 2 x %/100) + ………..

7. 3-4 200 200 What is the name of the force that overcomes the repulsion between protons in the nucleus? –Strong Nuclear Force

8. 3-4 400 400 Which substance would be found at the bottom of a density column the most or the least dense substance? Why? –Most dense will be found at the bottom of the column –The particles are closer together creating a higher mass per volume

9. 3-4 600 600 What would you guess to be the most common isotope of Silicon? –Si-28

10. 3-4 800 800 What would you guess to be the most common isotope of potassium? Are you certain that is true –K – 39 –No it could be calculated at 39.10 with different isotopes

11. 3-4 1000 1000 Discuss the difference between an isotope and an ion? –Isotopes of the same element- vary in neutrons and atomic mass, but will have the same number of protons –Ions- have gained or lost electrons giving them a negative or positive charge calculated by #p - #e

12. 24-1 200 200 What is meant by the term half-life? –The amount of time needed for half of a radioactive sample to decay

13. 24-1 400 400 The half-life of Iodine-126 is 13days. If a sample is 52 days old and now contains 2.56 g, how many grams were present in the original sample? –41.0g (40.96 rounded correctly )

14. 24-1 600 600 The half-life of carbon-14 is 5730 years. If a C-14 sample is 28,650 yrs old and originally contained 126.8grams how much is now present? –3.963 g

15. 24-3 800 800 The half life of sodium is 1.00 minutes. How much of a 3.00 g sample of sodium would remain after 10 minutes? –0.00293

16. 24-3 1000 1000 Discuss the concept of “Mass Defect” –Matter is not conserved during nuclear reactions. Some matter is converted to energy. Lost mass can be calculated with the formula E = mc 2

17. Work it 200 200 There are two isotopes of carbon. C-12 and C-14. Which isotope is more abundant and how do you know? –C-12 is more abundant. The average atomic mass on the periodic table is 12.01amu, since this is a weighted average of the two isotopes C-12 must be more abundant because the averaged mass is pulled closer to it.

18. Work it 400 400 Calculate the average atomic mass of Ar with isotopes 0.337% 38 Ar, 0.063% 39 Ar and 99.60% 40 Ar –(38 x 0.00337) + (39 x 0.00063) + (40 x 0.9960) = 39.99 amu

19. Work it 600 600 Calculate the Average atomic mass of Ne if its isotopes occur as 90.92% 20 Ne, 0.257% 21 Ne and 8.82% 22 Ne? –(20 x 0.9092) + (21 x 0.00257) +(22 x 0.0882) = 20.18 amu

20. Work it 800 800 Calculate the number of protons, electrons and neutrons in F-19 atom. In Cs-133 atom. In Fe 3+ ion –P = 9, e = 9, N = 10 –P = 55, e = 55, N = 78 –P = 26, e = 23, can’t calculate the neutrons without the mass

21. Old School 1000 1000 Calculate the mass of a fish tank with the measurements of 138 cm x 122cm x 336 cm. The density of water is 0.998g/ml –M = D x V –5650000g or 5.65 x 10 6 g

22. Final Jeopardy What is the formula for density? –D=m/v.