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MIDTERM INFO

MIDTERM INFO. The Midterm is comprehensive County Assessment (1 st & 2 nd Quarter) 50 MC Questions & 1 BCR Teacher-Designed Exam (1 st & 2 nd Quarter) 25 MC Questions. MidTerm Exam Schedule Tues, 1/15 Full Day –Period 4B Exam during the regular time pd

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MIDTERM INFO

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  1. MIDTERM INFO • The Midterm is comprehensive • County Assessment (1st & 2nd Quarter) • 50 MC Questions & 1 BCR • Teacher-Designed Exam (1st & 2nd Quarter) • 25 MC Questions

  2. MidTerm Exam Schedule Tues, 1/15 Full Day –Period 4B Exam during the regular time pd Wed, 1/16 Day 2 -Examinations – Periods 1 & 2 Schools close 3 hours early. Thurs, 1/17 Day 3 -Examinations – Periods 3 & 4A Schools close 3 hours early. Fri, 1/18 Day 4 -Examinations – Periods 5 & 6 Schools close 3 hours early.

  3. Chemistry Midterm Review Day #2

  4. Agenda • Practice Problems and Review Sheet Homework • Review Sheet # 2 – due Monday or Tuesday

  5. Practice Problem • Difference between an organic and inorganic cpd is…

  6. Organic cpds have a C - H bond. Inorganic cpds can have C or H but not this bond.

  7. Review • Show accuracy and precision using a dart board.

  8. Accuracy vs. Precision • Accuracy – closeness to the actual value • Precision – reproducibility

  9. Review • What is the Law of Conservation of Mass and Energy?

  10. Answer • Mass and energy are neither created nor destroyed during ordinary chemical reactions or physical changes. • They are just rearranged! • The mass of all the reactants is equal to the mass of all the products. • The energy that goes in to the reaction is equal to the energy that comes out.

  11. Review • Draw Bohr’s Model for Argon

  12. Review • Where on the periodic table do we find the s, p, d, and f blocks?

  13. Practice Problem • Write the formulas for the following: (a) barium carbonate, (b) sodium phosphate, and (c) carbon tetrachloride

  14. Answers • a) BaCO3 b) Na3PO4 c) CCl4

  15. Review Question • Name the following compound: • Cu(BrO3)2

  16. Answer • Copper(II) bromate

  17. Review • List the symbol, charge, and penetration power for each type of radiation: • Alpha particles • Beta particles • Gamma radiation

  18. http://www.avon-chemistry.com/nuclear_24.gif

  19. Alpha Radiation α 238 4 U ? + He 92 2 Uranium-238 Alpha Particle Note that the mass number always decreases by 4 after the alpha emission. Atomic number decreases by 2

  20. Alpha Radiation α 238 234 4 U Th + He 92 90 2 Uranium-238 Thorium-234 Alpha Particle

  21. Beta Radiation β 234 0 Th + e 90 -1 Thorium-234Beta particle By combining the charges from the bottom of the two symbols, figure out the symbol for the remaining particle ?

  22. Beta Radiation β 234 234 0 Th Pa + e 90 91 -1 Thorium-234Beta particle During the emission, a Thorium neutron becomes a proton and an electron. The electron is emitted as a beta particle. Pa Protactinium-234

  23. Practice Problem • Give 2 examples of quantitative data. Give 2 examples of qualitative data.

  24. Answers Quantitative data = how big, how fast, how tall = measured Qualitative = relates to our 5 senses – color, texture, odor, shape

  25. Practice Problem A small sphere has a mass of 2.5 grams. It has a density of 2.9 g/cm3. Determine the volume of the sphere.

  26. Answer • 0.86 cm3

  27. Review • How can we tell individual element apart using a spectrometer?

  28. Elements Emit only Specific Wavelengths • Individual elements emit a spectrum containing discrete lines • This is called a line spectrum

  29. Review Label each substance as a chemical change, physical change, chemical property, or physical property: a. density b. melting an ice cube c. reacts with oxygen d. penny turns green e. dissolving sugar f. Color g. Grilling a hamburger

  30. Review Label each substance as a chemical change, physical change, chemical property, or physical property: a. density – physical property b. melting an ice cube – physical change c. reacts with oxygen – chemical property d. penny turns green – chemical change e. dissolving sugar – physical change f. Color – physical property g. Grilling a hamburger – chemical change

  31. Review • Classify each of the following as: elements (E), compounds (C),homogeneous mixtures (Hom), or heterogeneous mixtures (Het). • Copper 3. Lemonade • Carbon dioxide 4. Salad Think of two other examples of each.

  32. Answer • Copper - E • Carbon dioxide - C • Lemonade – Hom • 4. Salad – Het

  33. Review • If electrons in an atom have the lowest possible energy, the atom is in a state. • If the electron absorbs energy from an outside source (heat, electrical current), the atom is in an state. • How does this pertain to a flame test?

  34. Answer • If electrons in an atom have the lowest possible energy, the atom is in a ground state. • If the electron absorbs energy from an outside source (heat, electrical current), the atom is in an excited state.

  35. Review • Identify the shape of each of the following molecules: • (a) ammonia (NH3) • (b) water (H2O)

  36. Answer • (a) Pyramidal • (b) Bent

  37. Review • List radiation of the electromagnetic (EM) spectrum from shortest to longest wavelength.

  38. Answer Gamma, x-rays, UV, visible light, IR, Microwave, radio Visible light = VIBGYOR

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