June 2015  Chemistry Regents #46-50

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Questions 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

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46 A rigid cylinder with a movable piston contains 50.0 liters of a gas at 30.0C with a pressure of 1.00 atmosphere. What is the volume of the gas in the cylinder at STP?

(1) 5.49 L (3) 55.5 L

(2) 45.0 L (4) 455 L

2 link PV/T=PV/T

 

temp in kelvin

47.  Given the potential energy diagram for a chemical reaction:


Which numbered interval represents the heat of reaction?

(1) 1     (3) 3

(2) 2     (4) 4

4 link heat of reaction is delta H

difference between the products and reactants

floating triangle

Base your answers to questions 48 and 49 on the graph below and on your knowledge of chemistry.

48 What is represented by the number "1" in the IUPAC name for three of these alcohols?

(1) the number of isomers for each alcohol

(2) the number of -OH groups for each carbon atom in each alcohol molecule

(3) the location of an -OH group on one end of the carbon chain in each alcohol molecule

(4) the location of an -OH group in the middle of the carbon chain in each alcohol molecule

 

 

 

 

 

 

 

 

 

 

 

 

3

link rule #4  use numbers to give location of functional group

49 What can be concluded from this graph?

(1) At 101.3 kPa, water has a higher boiling point than 1-butanol.

(2) At 101.3 kPa, water has a lower boiling point than ethanol.

(3) The greater the number of carbon atoms per alcohol molecule, the lower the boiling point of the alcohol.

(4) The greater the number of carbon atoms per alcohol molecule, the higher the boiling point of the alcohol.

4 link use table P to determine the number of carbons

 

50 In the laboratory, a student investigates the effect of concentration on the reaction between HCl(aq) and Mg(s), changing only the concentration of HCl(aq).

Data for two trials in the investigation are shown in the table below.

Compared to trial 1, what is the expected reaction time for trial 2 and the explanation for that result

(1) less than 48s, because there are fewer effective particle collisions per second

(2) less than 48s, because there are more effective particle collisions per second

(3) more than 48s, because there are fewer effective particle collisions per second

(4) more than 48s, because there are more effective particle collisions per second

2 link higher concentration, more collisions, less time

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

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