Thermochemistry
1)Chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________∆H at constant pressure.
  

2)While performing the calorimetry experiment in the lab, a student wishes to determine the water equivalent of calorimeter. He pours 50 ml of hot water at 55 °C into the calorimeter containing 50 ml of water at 27 °C. After mixing the two, he got the final temperature as 38 °C. What is the value of water equivalent of calorimeter?
  

3)Which one of the following devices is used to determine the enthalpy of dissolution of a given salt?
  

4)For a given chemical reaction, ∆H is negative. This means that the reaction is _______________.
  

5)Which statement is true?
  

6)The reaction CaCl₂.6H₂O (s)+400H₂O (l)→CaCl₂.6H₂O (400H₂O); ∆H=+18.83 kJ is ________________and heat is _______________by the reaction.
  

7)Which one of the following is incorrect?
  

8)When NH₄Cl (s) is added to water, the resulting solution feels cool to touch. Which best describes this observation?
  

9)The reaction CaCl₂ (s) + 400H₂O (l) → CaCl₂ (400H₂O); ∆H = -78.60 kJ is _________________ and heat is ______________ by the reaction.
  

10)Which one of the following is the correct equation for calculating the enthalpy of dissolution of a salt?
  

 
 
 
 


  


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