Multiple Choice (60%)

Transcription

1 Chemistry Test 4-3 (May) Please use the answer sheet. Thank you! Multiple Choice (60%) 1) Please consider a 5.00-mL sample of lead with a density of 11.4 g/ml and a 5.00-mL sample of gold with a density of 19.2 g/ml. Please choose all true statements. A) The gold has a smaller volume than the lead. B) The gold has the same mass as the lead. C) The gold contains fewer atoms than the lead. D) The gold has a greater mass than the lead. E) None of these are true. 2) A sample of a solution has more water added to it. Which one is true? A) The molarity increases because solvent has been added. B) The molarity increases because solute has been added. C) The molarity decreases because solvent has been added. D) The molarity decreases because solute has been added. 3) Which one occurs when a seed crystal is dropped into a supersaturated solution? A) It dissolves and then precipitates. B) It dissolves and remains dissolved. C) It falls to the bottom and remains undissolved. D) It causes dissolved solute to precipitate. 4) A solution has [H + ] = 4.71 X What is the ph? 5) A solution has [OH ] = 2.50 X What is the ph? 6) Please choose all compounds with ionic bonds. A) P 4 O 6 B) K 2 S C) O 2 D) CO 2 E) (NH 4 ) 2 (SO 4 ) 7) Please choose all compounds with covalent bonds. A) As 2 O 3 B) SO 2 C) CaCl 2 D) Ni(ClO 2 ) 2 E) Br 2 8) Which one is an example of a cation that is isoelectronic with Kr? A) Br + B) Y 3 C) Se 2+ D) Sr 2 E) Y 3+ 9) Which one is an example of an anion that is isoelectronic with Ne? A) Al 3+ B) F 2 C) O 2 D) Mg 2 E) F +

2 10) What is the name for H 3 P? A) Phosphorous acid B) Phosphoric acid C) Hydrophosphorous acid D) Hydrophosphoric acid 11) Which one is the formula for sulfurous acid? A) H 2 S B) HSO 4 C) H 2 SO 4 D) HSO 3 E) H 2 SO 3 12) Which one best describes a solution with a large mass of solvent and a small mass of solute? A) Concentrated with a high molarity B) Concentrated with a low molarity C) Dilute with a high molarity D) Dilute with a low molarity 13) Please choose all that are matched correctly. A) ph 8 = weak base B) ph 14 = strong acid C) ph 14 = strong base D) ph 6 = strong acid E) ph 1 = weak acid 14) Which one will decrease the solubility of a gaseous solute in water? A) Increase the temperature and increase the pressure B) Increase the temperature and decrease the pressure C) Decrease the temperature and increase the pressure D) Decrease the temperature and decrease the pressure 15) Which one will decrease the solubility of a solid solute in water? A) Increase the temperature and increase the surface area B) Increase the temperature and decrease the surface area C) Decrease the temperature and increase the surface area D) Decrease the temperature and decrease the surface area 16) What is the empirical formula for C 6 H 15? 17) A compound has an empirical formula C 2 H 5 and a molar mass of g. What is the molecular formula? 18) Which atom would we predict to have the greatest electron affinity? A) One with many protons and many electron clouds B) One with few protons and many electron clouds C) One with many protons and few electron clouds D) One with few protons and few electron clouds

3 Please consider the Lewis dot diagram for SO 3 2 for questions ) Which one best describes the central atom in HCO? A) 2 bonding pairs of electrons and 0 lone pairs B) 3 bonding pairs of electrons and 1 lone pair C) 3 bonding pairs of electrons and 0 lone pairs D) 2 bonding pairs of electrons and 1 lone pair 20) What is the electronic geometry for HCO? A) Trigonal planar B) Tetrahedral C) Trigonal pyramidal D) Bent E) Linear 21) What is the molecular geometry for HCO? A) Trigonal planar B) Tetrahedral C) Trigonal pyramidal D) Bent E) Linear 22) Please consider an atom of oxygen and an atom of fluorine. Please choose all correct statements. A) The O atom has a smaller ionization energy because it has fewer protons and more electron clouds. B) The F atom has a greater ionization energy because it has more protons and the same number of electron clouds. C) The O atom has a larger radius because it has fewer protons and the same number of electron clouds. D) The F atom has a greater ionization energy because it has more protons and fewer electron clouds. 23) Which one has the smallest atomic radius? A) K B) Cu C) Ca D) Kr E) Br 24) Which one has the largest radius? A) Si 4 B) Cl C) K + D) Ar E) Sc 3+ 25) Please choose all molecules that would be polar covalent. A) Trigonal planar electronic geometry and bent molecular geometry B) Tetrahedral electronic geometry and trigonal pyramidal molecular geometry C) Tetrahedral electronic geometry and tetrahedral molecular geometry D) Tetrahedral electronic geometry and bent molecular geometry

4 26) D E T ( o C) C A B Heat (J) Please choose all true statements. A) D represents heat of fusion and heat of vaporization. B) B represents heat of solidification and heat of condensation. C) C represents liquid H 2 O boiling. D) E represents steam being heated. E) A represents ice being melting. 27) What is the ending electron configuration for As 2? 28) Please choose all that have identical atoms as the representative particle. A) 14 kt gold B) Helium C) 24 kt gold D) Sand (SiO 2 ) E) Air 29) Please choose all true statements. A) The boiling point of water is 0 o C. B) Heat of condensation = +q. C) Heat of fusion = q. D) Heat of solidification = q. E) The melting point of ice is 0 o C. 30) Please use the attached solubility graph. When a saturated solution of NaNO 3 in 100 g H 2 O is heated from 10 o C to 35 o C, what additional mass of NaNO 3 will dissolve in the solution to keep the solution saturated?

5 Problems (40%) Please show all your work for any credit! 1) How many ppies are in 3.70 X kpies? 2) How many MJ are in 94.0 cj? 3) What is the % yield oxygen? 2 Al(ClO 3 ) 3 (s) 2 AlCl 3 (s) + 9 O 2 (g) Mass of crucible Mass of crucible + Al(ClO 3 ) 3 Mass of crucible after heating g g g 4) A compound contains g carbon, g hydrogen & g oxygen. What is its empirical formula? 5) A 47.8-g sample of aluminum has an initial temperature of 7.0 o C. It loses 563 J of heat. What is the final temperature of the sample? The specific heat capacity of aluminum is J/g o C.

6 Chemistry Test 4-3 (Flowers) Please use the answer sheet. Thank you! Multiple Choice (60%) 1) Please consider a 5.00-mL sample of lead with a density of 11.4 g/ml and a 5.00-mL sample of gold with a density of 19.2 g/ml. Please choose all true statements. A) The gold has a smaller volume than the lead. B) The gold has the same mass as the lead. C) The gold contains fewer atoms than the lead. D) The gold has a greater mass than the lead. E) None of these are true. 2) A sample of a solution has more water added to it. Which one is true? A) The molarity increases because solvent has been added. B) The molarity increases because solute has been added. C) The molarity decreases because solvent has been added. D) The molarity decreases because solute has been added. 3) Which one occurs when a seed crystal is dropped into a supersaturated solution? A) It dissolves and then precipitates. B) It dissolves and remains dissolved. C) It falls to the bottom and remains undissolved. D) It causes dissolved solute to precipitate. 4) A solution has [H + ] = 4.71 X What is the ph? 5) A solution has [OH ] = 2.50 X What is the ph? 6) Please choose all compounds with ionic bonds. A) P 4 O 6 B) K 2 S C) O 2 D) CO 2 E) (NH 4 ) 2 (SO 4 ) 7) Please choose all compounds with covalent bonds. A) As 2 O 3 B) SO 2 C) CaCl 2 D) Ni(ClO 2 ) 2 E) Br 2 8) Which one is an example of a cation that is isoelectronic with Kr? A) Br + B) Y 3 C) Se 2+ D) Sr 2 E) Y 3+ 9) Which one is an example of an anion that is isoelectronic with Ne? A) Al 3+ B) F 2 C) O 2 D) Mg 2 E) F +

7 10) What is the name for H 3 P? A) Phosphorous acid B) Phosphoric acid C) Hydrophosphorous acid D) Hydrophosphoric acid 11) Which one is the formula for sulfurous acid? A) H 2 S B) HSO 4 C) H 2 SO 4 D) HSO 3 E) H 2 SO 3 12) Which one best describes a solution with a large mass of solvent and a small mass of solute? A) Concentrated with a high molarity B) Concentrated with a low molarity C) Dilute with a high molarity D) Dilute with a low molarity 13) Please choose all that are matched correctly. A) ph 8 = weak base B) ph 14 = strong acid C) ph 14 = strong base D) ph 6 = strong acid E) ph 1 = weak acid 14) Which one will decrease the solubility of a gaseous solute in water? A) Increase the temperature and increase the pressure B) Increase the temperature and decrease the pressure C) Decrease the temperature and increase the pressure D) Decrease the temperature and decrease the pressure 15) Which one will decrease the solubility of a solid solute in water? A) Increase the temperature and increase the surface area B) Increase the temperature and decrease the surface area C) Decrease the temperature and increase the surface area D) Decrease the temperature and decrease the surface area 16) What is the empirical formula for C 6 H 15? 17) A compound has an empirical formula C 2 H 5 and a molar mass of g. What is the molecular formula? 18) Which atom would we predict to have the greatest electron affinity? A) One with many protons and many electron clouds B) One with few protons and many electron clouds C) One with many protons and few electron clouds D) One with few protons and few electron clouds

8 Please consider the Lewis dot diagram for SO 3 2 for questions ) Which one best describes the central atom in HCO? A) 2 bonding pairs of electrons and 0 lone pairs B) 3 bonding pairs of electrons and 1 lone pair C) 3 bonding pairs of electrons and 0 lone pairs D) 2 bonding pairs of electrons and 1 lone pair 20) What is the electronic geometry for HCO? A) Trigonal planar B) Tetrahedral C) Trigonal pyramidal D) Bent E) Linear 21) What is the molecular geometry for HCO? A) Trigonal planar B) Tetrahedral C) Trigonal pyramidal D) Bent E) Linear 22) Please consider an atom of oxygen and an atom of fluorine. Please choose all correct statements. A) The O atom has a smaller ionization energy because it has fewer protons and more electron clouds. B) The F atom has a greater ionization energy because it has more protons and the same number of electron clouds. C) The O atom has a larger radius because it has fewer protons and the same number of electron clouds. D) The F atom has a greater ionization energy because it has more protons and fewer electron clouds. 23) Which one has the smallest atomic radius? A) K B) Cu C) Ca D) Kr E) Br 24) Which one has the largest radius? A) Si 4 B) Cl C) K + D) Ar E) Sc 3+ 25) Please choose all molecules that would be polar covalent. A) Trigonal planar electronic geometry and bent molecular geometry B) Tetrahedral electronic geometry and trigonal pyramidal molecular geometry C) Tetrahedral electronic geometry and tetrahedral molecular geometry D) Tetrahedral electronic geometry and bent molecular geometry

9 26) D E T ( o C) C A B Heat (J) Please choose all true statements. A) D represents heat of fusion and heat of vaporization. B) B represents heat of solidification and heat of condensation. C) C represents liquid H 2 O boiling. D) E represents steam being heated. E) A represents ice being melting. 27) What is the ending electron configuration for As 2? 28) Please choose all that have identical atoms as the representative particle. A) 14 kt gold B) Helium C) 24 kt gold D) Sand (SiO 2 ) E) Air 29) Please choose all true statements. A) The boiling point of water is 0 o C. B) Heat of condensation = +q. C) Heat of fusion = q. D) Heat of solidification = q. E) The melting point of ice is 0 o C. 30) Please use the attached solubility graph. When a saturated solution of NaNO 3 in 100 g H 2 O is heated from 10 o C to 35 o C, what additional mass of NaNO 3 will dissolve in the solution to keep the solution saturated?

10 Problems (40%) Please show all your work for any credit! 1) How many kpies are in 3.70 X ppies? 2) How many cj are in 94.0 MJ? 3) What is the % yield oxygen? 2 Al(ClO 3 ) 3 (s) 2 AlCl 3 (s) + 9 O 2 (g) Mass of crucible Mass of crucible + Al(ClO 3 ) 3 Mass of crucible after heating g g g 4) A compound contains g carbon, g hydrogen & g oxygen. What is its empirical formula? 5) A 37.8-g sample of aluminum has an initial temperature of 8.0 o C. It loses 653 J of heat. What is the final temperature of the sample? The specific heat capacity of aluminum is J/g o C.

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12 Chemistry Test 4-2 Form Name Multiple Choice (60%) 1) 16) 2) 17) 3) 18) 4) 19) 5) 20) 6) 21) 7) 22) 8) 23) 9) 24) 10) 25) 11) 26) 12) 27) 13) 28) 14) 29) 15) 30)

13 Problems (40%) Please show all your work for any credit. 1) 2) 3) 4) 5)