June 2017 Chemistry Regents #61-63

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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

Question 51-53 Questions 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

 

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Questions 61-63

 

 

Base your answers to questions 61 through 63 on the information below and on your knowledge of chemistry. 

*A test tube contains a sample of solid stearic acid, an organic acid.

 *Both the sample and the test tube have a temperature of 22.0°C.

*The stearic acid melts after the test tube is placed in a beaker with 320. grams of water at 98.0°C.

*The temperature of the liquid stearic acid and water in the beaker reaches 74.0°C.

61 Identify the element in stearic acid that makes it an organic compound. [1]

Answer-->  Carbon

62 State the direction of heat transfer between the test tube and the water when the test tube was placed in the water. [1]

Answer-->  water to the test tube

63 Show a numerical setup for calculating the amount of thermal energy change for the water in the beaker. [1]

Answer-->   Q=mCDT=(320.g)(4.18J/goC)(74oC-98oC)

DT  the temps were reversed also was given credit

on to Questions 64-65

 

 

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

Question 51-53 Questions 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

 

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