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Determine the bond energy of the h-br bond

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Chemistry study guide help

Question 1: Determine which of the molecules below contain polar covalent bonds AND use the appropriate symbols to represent the positive and negative poles.

a) H-Br b) I-I c) H-O-H d) NF3

Question 2: Determine the bond energy of the H-Br bond given the following: The bond energy of the H-H bond is 432 kJ/mol and the bond energy of the Br-Br bond is 190 kJ/mol. please explain how to get this

Question 3: Using what you know about the relationship between bond length and atomic radius, determine which of the following has the longest bond length: ) a) H-H b) F-F c) Cl-Cl d) Br-Br e) I-I

Question 4: Draw the Lewis dot structures for each of the following molecules : ( show the steps for each including total valence electrons, number of electrons wanted by each atom) a) NOCl b) CH3Br

Question 5: Determine the Lewis structure, VSEPR, and Name of Shape for the following (please explain the steps) a) XeF4 b) SCl2

Question 6:  Determine the oxidation number of the following: a) Determine the oxidation number of Cr in Cr(OH)3 b) Determine the oxidation number of Br in BrO3 - c) Determine the oxidation number of Mo in MoO4 2- d) Determine the oxidation number of Cl in HClO2

Question 7:  You fill an uninflated balloon with 2.8 grams of solid CO2 (dry ice, M= 44.0 g/mol). What volume will the dry ice occupy when it vaporizes at 25oC and 1.02 atm? The balloon has capacity of 4.5 liters, will it pop?

Question 8: What is the density in g/L of argon at standard temperature and pressure (STP)? 

Question 9: An average dairy cow produces 11,896 grams of methane gas, CH4, each year. What volume of CH4 is produced at 35 oC and 840 mmHg? (Hint: convert grams to moles of CH4)

Question 10: What is the partial pressure of helium gas in a mixture of 42 grams of oxygen and 42 grams of helium held in a vessel at a pressure of 1250 torr? 

Question 11: Convert the following: a) 680 mmHg to atm b)430 mmHg to torr

Question 12: How would you make 250 mL of 18% (w/v) NaCl? (Be sure to include final volume of water needed)

Question 13: What does 2.5% (w/v) NaCl mean?

Question 14: You have a stock solution of 45X TAE Buffer. How would you prepare 250 mL of TAE Buffer at working concentration (1X) from the 45X stock?

Reference no: EM132418348

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