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Part 2 EOC review

Part 2 EOC review. 2013. Which substance listed on the table is a liquid at 27 o C?. Answer:. Sample I is still frozen at 27 o C. Sample II and IV boil into a gas before 27 o C. Which will increase the solubility of most solid solutes? . ( A) decreasing the temperature

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Part 2 EOC review

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  1. Part 2 EOC review 2013

  2. Which substance listed on the table is a liquid at 27oC?

  3. Answer: Sample I is still frozen at 27oC. Sample II and IV boil into a gas before 27oC

  4. Which will increase the solubility of most solid solutes? • (A) decreasing the temperature • (B) decreasing the amount of solvent at constant temperature • (C) increasing the amount of solute at constant temperature • (D) Increasing the temperature

  5. (D) Increasing the temperature

  6. What type of bonding is associated with compounds that have the following characteristics: • •high melting points • •conduct electricity in the molten state • •solutions conduct electricity • •normally crystalline solids at room temperature. • (A) covalent (B) ionic ( C ) hydrogen (D) metallic

  7. Answer • (B) Ionic

  8. Which is a unique characteristic of the bonding between metal atoms? • (A) Atoms require additional electrons to reach a stable octet. • (B) Atoms must give away electrons to reach a stable octet. • (C) Atoms share valence electrons only with neighboring atoms to reach a stable octet. • (D) Delocalized electrons move among many atoms creating a sea of electrons.

  9. Answer • (D) Delocalized electrons move among many atoms creating a sea of electrons.

  10. Which pair of elements would most likely bond to form a covalentlybonded compound? • (A) sodium and fluorine • (B) barium and chlorine • (C) phosphorus and oxygen • (D) magnesium and sulfur

  11. Answer • (C) phosphorus and oxygen • * covalent bonds are between 2 or more nonmetals. Phosphorus & oxygen are both nonmetals.

  12. Based on the VSEPR theory, what is the molecular geometry of a molecule of PI3? • (A) linear • (B) tetrahedral • (C) trigonal planar • (D) trigonal pyramidal

  13. Answer • 3 shared pairs of electrons; 1 unshared pair of electrons on central atom. (D) trigonal pyramidal

  14. What happens when energy is removed from liquid water? • (A) Molecules slow down, and more hydrogen bonds are formed. • (B) Molecules slow down, and more hydrogen bonds are broken. • (C) Molecules move faster, and more hydrogen bonds are formed. • (D) Molecules move faster, and more hydrogen bonds are broken.

  15. Answer • (A) Molecules slow down, and more hydrogen bonds are formed. • * I don’t particularly like this question as hydrogen bonds are not really bonds. Rather than saying “more hydrogen bonds are formed”, a better way to word the answer would have been “the hydrogen bonding (or intermolecular forces) between the molecules becomes stronger”.

  16. The compound formed between element X and oxygen has the chemical formula X2O. Which element would X most likely represent? • (A) Fe • (B) Zn • (C) Ag • (D) Sn

  17. Answer • (A) Fe (B) Zn (C) Ag (D) Sn • * b/c oxygen’s oxidation # is -2, criss-crossing the numbers means X must have an oxidation # of +1. The only one of the answer choices that has a +1 oxidation # is Ag. Fe can be +2 or +3, Zn is +2, and Sn can be +2 or +4.

  18. How many moles are in 59.6 grams of BaSO4? • (A) 0.256 mole • (B) 3.91 moles • (C) 13.9 moles • (D) 59.6 moles

  19. Answer • (A) 0.256 mole • 59.6 grams BaSO4 1 mole • 233g

  20. . What is the volume of two moles of hydrogen gas at STP? • (A) 44.8 L • (B) 22.4 L • (C) 11.2 L • (D) 2.00 L

  21. Answer • (A) 44.8L • 2 moles H2 22.4L • 1 mole

  22. How many molecules are contained in 55.0 g of H2SO4? • (A) 0.561 molecule • (B) 3.93 molecules • (C) 3.38 x 1023 molecules • (D) 2.37 x 1024 molecules

  23. ANSWER • (C) 3.38 x 1023molecules • 55.0 g of H2SO4 1 mole 6.02x1023molecules = • 98G

  24. If a sample of magnesium has a mass of 60. g, how many moles of magnesium does the sample contain? • (A) 1.1 moles • (B) 1.2 moles • (C) 2.0 moles • (D) 2.5 moles

  25. Answer • (D) 2.5 moles • 60. g Mg 1mole • 24g

  26. A compound has an empirical formula of CH2O and a molecular mass of 180 g. • What is the compound’s molecular formula? • (A) C3H6O3 • (B) C6H12O6 • (C) C6H11O7 • (D) C12H22O11

  27. Answer • (B) C6H12O6 • 180g = 6 molecular mass / empirical formula mass • 30g • C(1x6)H(2x6)O(1x6)

  28. . What is the percent by mass of iron in the compound Fe2O3? • (A) 70% • (B) 56% • (C) 48% • (D) 30%

  29. Answer • (A) 70% • Mass of element x 100 (2x56) x 100 • Mass of compound 160g

  30. Consider the spectrum for the hydrogen atom. In which situation will light be produced? • (A) Electrons absorb energy as they move to an excited state. • (B) Electrons release energy as they move to an excited state. • (C) Electrons absorb energy as they return to the ground state. • (D) Electrons release energy as they return to the ground state.

  31. Answer • (D) Electrons release energy as they return to the ground state.

  32. . A piece of metal is heated in a Bunsen burner flame and then immersed in a beaker of cool water. Which statement best describes the effect of the temperature changes on the kinetic energy of the particles? • (A) Kinetic energy of metal atoms decreases in the flame. • (B) Kinetic energy of water molecules increases when the heated metal is immersed. • (C) Kinetic energy of water molecules decreases when the heated metal is immersed. • (D) Kinetic energy of metal atoms increases when immersed in the cooler water.

  33. Answer (B) Kinetic energy of water molecules increases when the heated metal is immersed.

  34. Between points X and Y, which would be observed? • (A) Solid and liquid will be present. • (B) Only vapor will be present. • (C) Liquid and vapor will be present. • (D) Only liquid will be present.

  35. Answer • (C) Liquid and vapor will be present.

  36. An open container of water is brought to a boil and heated until all of the water is converted to water vapor. Which describes the changes in the water molecules? • (A) The molecules speed up and move farther apart. • (B) The molecules speed up and move closer together. • (C) The molecules slow down and move farther apart. • (D) The molecules slow down and move closer together.

  37. Answer • (A) The molecules speed up and move farther apart.

  38. 6.00 g of gold was heated from 20.0°C to 22.0°C. How much heat was applied to the gold? • (A) 1.56 J • (B) 15.5 J • (C) 17.0 J • (D) 32.5 J

  39. Q = mc T • Q = (6g)(.13j/goC)(22-20oC) • (A) 1.56 J

  40. . A student has a beaker containing 55 g of water at 100°C. How much heat is needed to convert the water to steam? • (A) 120,000 J • (B) 18,000 J • (C) 2,200 J • (D) 330 J

  41. Answer • Q = (m)(Hvap) • Q = (55g)(2260j/g) = (A) 120,000 J • 2260j/g is a reference number!

  42. An 18.0-g piece of an unidentified metal was heated from 21.5°C to 89.0°C. If 292 J of heat energy was absorbed by the metal in the heating process, what was the identity of the metal?

  43. 292j = (18g)(C ) (89 -21.5) (D) Silver • Silver • 0.24 J/g•°C

  44. When a chemical cold pack is activated, it becomes cool to the touch. What is happening in terms of energy? • (A) An exothermic reaction is occurring, absorbing cold from its surroundings. • (B) An exothermic reaction is occurring, releasing heat to its surroundings. • (C) An endothermic reaction is occurring, releasing cold to its surroundings. • (D) An endothermic reaction is occurring, absorbing heat from its surroundings.

  45. Answer • (D) An endothermic reaction is occurring, absorbing heat from its surroundings.

  46. What products are formed when the metal potassium is added to water? • (A) K and H2O • (B) KOH and H2O • (C) K2O and H2 • (D) KOH and H2

  47. Single-replacement reaction A + BC  AC + B element compound element compound + + 

  48. Answer • (D) KOH and H2 • K + H2O  single replacement; H and K switch

  49. When Na2O reacts with H2O, what is produced? • (A) HNaO2 • (B) Na +H2O • (C) NaO + H2 • (D) NaOH

  50. Double Replacement reaction AB + CD  CB + AD compound compound compound compound 

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