Chemistry Answers Page

Day 12

  1. 3, 1, 5, 2, 4
  2. B
  3. B
  4. B, A, A, A, B
  5. B, A, B, A
  6. C
  7. D
  8. B
  9. Experiment is to determine whether the hypothesis is correct. If not, alter the hypothesis and conduct additional experiments to test the new hypothesis. (It is
    often an ongoing process for scientists.) Or similar answer.
  10. Safe, unsafe, safe, unsafe, unsafe (obstructs sight), safe, unsafe
  11. B
  12. C
  13. B, D, C, A
  14. 8.0cm³
  15. 31.0mL
  16. 24.0g
  17. 160,000
  18. 5x 10³
  19. 5.6 x 10⁻³
  20. 0.097
  21. 3.35 x 10⁻¹s
  22. 4.5 x 10-5 dL
  23. 3.5 x 10⁻³ km
  24. 6.7 x 10⁻¹ g
  25. 3
  26. 2
  27. 3 (the final zero is significant)
  28. 4
  29. 2
  30. 3 (the final zero is significant)

Day 19

silver is metal 1, rhodium is metal 2, platinum is metal 3

Day 24

  1. B
  2. A
  3. D
  4. C
  5. P
  6. C
  7. P
  8. C
  9. P
  10. C
  11. B
  12. C
  13. A
  14. D
  15. B
  16. A
  17. C
  18. A
  19. Chocolate chip cookie, anything with different sized parts or pieces
  20. Salt water, anything that has 2 or more parts evenly distributed and can be separated by physical means
  21. Magnetism (magnetism through distillation in any order, with the non-numbered as extra credit)
  22. Centrifuge
  23. Filtration
    Evaporation
    Distillation
  24. B
  25. Solid to liquid
  26. Liquid to solid
  27. Gas to liquid
  28. Solid to gas
  29. Melting and freezing point
  30. Mass is not created nor destroyed in a reaction (or similar answer)
  31. 0.4 g/cm³
  32. 128 g
  33. Less than 1 g/cm³ (extra credit)
  34. Greater than 1 g/cm³ (extra credit)1 g/cm³ (extra credit)

Day 38

  1. B
  2. A
  3. C
  4. A
  5. C
  6. C
  7. A
  8. C
  9. B
  10. C
  11. B
  12. D
  13. A
  14. B
  15. A
  16. Three of the following:
    1. All matter is composed of indivisible particles called atoms
    2. All atoms of an element are identical, atoms of different elements have
      different properties
    3. Chemical reactions involve the combination of atoms, not the destruction
      of atoms
    4. When elements react to form compounds, they react in defined, whole number ratios.
  17. 3, 3, 4, 3
  18. 26, 26. 30, 26
  19. 6, 6, 8, 6
  20. 8, 8, 9, 8
  21. 7.5 x 10⁷m
  22. B
  23. A
  24. a. 1s² b. 1s²2s²2p³ c. 1s²2s²2p⁶3s²3p⁶4s²
  25. a. (↑↓)
    b. (↑↓) (↑↓) (↑) (↑) (↑)
    c. (↑↓) (↑↓) (↑↓) (↑↓) (↑↓) (↑↓) (↑↓) (↑↓)(↑↓) (↑↓)Extra credit:
    a. may behave as a wave
    b. may behave as a stream of particles (called photons or quanta)

Day 49

  1. A
  2. B
  3. C
  4. D
  5. A
  6. B
  7. C
  8. A
  9. B
  10. C
  11. C
  12. B
  13. D
  14. B
  15. C
  16. A
  17. A
  18. +1
  19. -3
  20. +3
  21. -1
  22. -2
    Extra credit: The atomic radius decreases across because since the number of electrons increases, the stronger the attraction between protons and electrons, pulling the electrons closer to the nucleus, causing a smaller radius. It decreases down the table because there is an increase in energy levels, with electrons farther away from the nucleus.

Day 68

  1. Ionic sodium carbonate
  2. Covalent diphosphorus pentoxide
  3. Covalent ammonia
  4. Ionic iron (II) sulfate
  5. Covalent silicon dioxide
  6. Ionic gallium chloride
  7. Ionic cobalt (II) bromide
  8. Covalent diboron tetrahydride
  9. Covalent carbon monoxide
  10.  Covalent phosphorus
  11.  Covalent N2O3
  12.  Covalent N2
  13.  Covalent CH4
  14.  Ionic LiC2H3O2
  15.  Covalent PF3
  16.  Ionic V2O5
  17.  Ionic Al(OH)3
  18.  Ionic ZnS
  19.  Covalent SiF4
  20.  Ionic Ag3PO4

Days 81-83 (student submitted answers)

[Part 1 – Evidence]

  1. The unknown substance was discovered to be the anti-venom. The anti-venom
    has a similar structure to that of Nelson’s allergy drug.
  2. 167.16 g/mol.
  3. 598.66 g/mol.
  4. Adding the weight of the anti-toxin and the compound C to the weight of the peanut
    allergy drug, it equals the weight of the unknown substance found in Nelson’s
    bloodstream.
  5. The unknown substance in addition to Nelson’s peanut allergy drug cancelled out
    the effects of the peanut allergy drug.
  6. Yes, Nelson did take his medication that day. However, the amount was lower than
    required.
  7. Yes. It showed how the compound C combines with the spider toxin.
  8. It is possible Joanna took the pills for Sam.
  9. They did not provide any important information.
  10. Yes, the peanuts and related products provided a way to cross reference with the
    other evidence.

[Part 2 – Conclusions]

  1. Sam Mellon
  2. Sam was jealous of Nelson receiving all of the credit.
  3. Sam knew what would happen if Nelson had the anti-toxin in his bloodstream in
    addition to the peanut allergy medication.

Day 93

Video Lab Answers:

  1. Mass of test tube with baking soda: 19.46 g
  2. Mass of empty test tube: 19.21 g
  3. Mass of baking soda: 0.25 g
  4. Mass of test tube and sodium chloride: 19.39 g
  5. Mass of sodium chloride: 0.18 g
  1. ? mol NaHCO3 = 0.25 g NaHCO3
    (1 mol NaHCO3 / 84.0 g NaHCO3) = 0.0030 mol NaHCO3
    (Note – 84.0 g is the Molar Mass of NaHCO3)
  2. ? mol NaCl = 0.18 g NaCl (1 mol NaCl / 58.5 g NaCl) = 0.0031 mol NaCl
  3. 0.0030:0.0031 or 1:1
  4. NaHCO3 + HCl →  NaCl + H2O + CO2 (no coefficients needed)
  5. 1:1
  6. “Although they should be the same, the experimental mole ration may be slightly different than the theoretical mole ration due to experimental error such as not allowing the test tube to be completely cooled when massing at the end or allowing some of the liquid to splatter out of the test tube when heating.” source

Day 119

  1. b. The wick of the candle is curled at the top.
  2. d. M is greater than or equal to one but less than ten.
  3. a. water displacement
  4. b. 1000 mm = 1 m
  5. c. Use multiple conversion factors.
  6. c. balance
  7. c. The chair will burn.
  8. b. CO
  9. c. pizza
  10.  c. compound
  11.  b. D = m / v
  12.  True
  13.  b. the protons and neutrons
  14.  d. all of these
  15.  c. 1s22s22p2
  16.  b. indivisible
  17.  b. mass
  18.  c. gas
  19.  b. 2
  20.  c. Sc