1. Review for Semester 1 Midterm Exam. What is the difference between mass number and atomic mass? 11/05/2014

2. Reminders Thurs, Nov 6: Semester 1 Midterm Mon, Nov 10: Science Fair Paper Rough Draft DUE Wed, Nov. 19: Science Fair Paper and Board DUE

3. Science Fair Judges Recruit judges for the Science Fair Judges must be +21 years old Judges must have a background in science –College students majoring in science –Engineers

4. Science Olympiad Interested in science competitions? Join the Von Science Olympiad Team! Fill out the application by Nov 8 on the Von Steuben site!

5. Von Bridge Competition Date: Monday, December 15, 2014 Task: Construct a bridge that withstands the most weight. Winners: Travel to IIT and Compete against various schools. Scholarships and t-shirts may be available. Interested? Sign up with Ms. Roden in 215 - after school on Monday before December 1st, 2014

6. VON Homework Cafe Monday – Thursday 2:45 pm – 4:00 pm in the cafeteria Snacks and computer access available! Each time you attend, you will be entered into a raffle. Drawings are held every 2 weeks. –The more you attend, the better your chance to win gift cards, Von gear, dance tickets, etc…

7. Recycle Ball One team picks a category and a point value. 15 seconds to discuss with team. I will randomly draw a name from the team to answer the question – no more discussions with group! If the team gets the correct answer, they get to shoot for more points.

8. 100 points 200 points

9. Subatomic particles Ions & Isotopes Density Atomic structure Miscellaneous 100 200 300 400 500 Jeopardy Trash Ball

10. Subatomic Particles : 100 Where are neutrons located? Back Answer: In the nucleus

11. Back Which subatomic particle has virtually NO mass? Answer: Electrons Subatomic Particles : 200

12. Back Which subatomic particles make up most of an atom’s mass? Answer: The protons & neutrons Subatomic Particles : 300

13. Back Which particle is a proton attracted to? Answer: an electron. Subatomic Particles : 400

14. Back As an electron gets further away from the nucleus, what happens to the coulombic attraction ? Answer: Decreases Subatomic Particles : 500

15. Back The mass number is determined by the number of____and ____ in an atom? ANSWER: Protons & Neutrons Ions & Isotopes : 100

16. Back If an Na atom has a mass number of 22, how many neutrons does it have? Answer: 11 neutrons Ions & Isotopes : 200

17. Back If 1 proton were added to a hydrogen atom, what would we name it? Answer: Helium Ions & Isotopes : 300

18. Back If an element has 17 protons and 18 electrons, will it be a cation or an anion? What is its identity? Answer: anion (Cl 1- ) Ions & Isotopes : 400

19. Back Why is the average atomic mass not a whole number ? Answer: It is a WEIGHTED average of all the isotopes of that element Ions & Isotopes : 500

20. Back What is the formula for density? Answer: D = M/V Density : 100

21. Back What is the formula to solve for mass (M=?) Answer: M= V * D Density : 200

22. Back What is the density of a cube that has volume of 100 cm 3 and mass of 10 g? Answer: 0.10 g/cm 3 Density : 300

23. Back Which is more dense: 5 g of lead or 10 g of lead? Answer: They have the same density. Density : 400

24. Back A gold statue has mass of 10 kg and density of 19.3 g/mL. What is its volume? Answer: 518.13 ml Density : 500

25. Back Where do we find electrons in an atom? Answer: In the electron cloud Atomic Structure : 100

26. Back What is an atom mostly made up of? Answer: empty space Atomic Structure : 200

27. Back What keeps an atom held together? Answer: Coulombic Attraction Atomic Structure : 300

28. Back How did scientists discover the existence of electrons? Answer: In the cathode ray tube, the stream of particles bent towards the positively-charged plate. Atomic Structure : 400

29. Describe Rutherford’s gold foil experiment and what it told us about atoms. Answer: Rutherford shot alpha particles at a piece of gold foil. Some particles were deflected but most passed through. This showed that the atom is mostly empty space. Back Atomic Structure : 500

30. Back Convert to scientific notation: 34,000 Miscellaneous : 100

31. Back 20,000 mm = __?__m Answer: 20 meters Miscellaneous : 200

32. Back What is mass? Answer: The amount of matter in a substance Miscellaneous : 300

33. Answer: They both change during an experiment. Independent changes because of the scientist. Dependent changes because of the independent. Back Compare and contrast independent and dependent variables. Miscellaneous : 400

34. Answer: Electrons in the atoms are excited by energy and jump to higher energy level. When they jump back down, they release energy in the form of photons. Each photon has a specific energy which has a specific wavelength which corresponds to a specific color. Back Describe how colors are produced. Miscellaneous : 500