8. Thermochemistry

Endothermic & Exothermic Reactions

Open Question
In which one of the following processes is the system endothermic?
563
views
Open Question
Which statement is true if the ΔH_rxn of a reaction is positive?
729
views
Open Question
2 Mg(s) + O₂(g) → 2 MgO(s) ΔH = −1204 kJ
585
views
Open Question
Identify which of the following is true for the reaction N₂(g) + 3 H₂(g) → 2 NH₃(g)
537
views
Open Question
Which has greater energy in an exothermic reaction, the reactants or the products?
595
views
Open Question
What would likely happen if you were to touch the flask in which an endothermic
638
views
Open Question
What type of process occurs when solidified wax is converted to liquid wax on heating?
643
views
Open Question
An (a) __________ reaction liberates heat and the temperature of the reaction mixture increases.
428
views
Open Question
The normal freezing point of n-octane (C₈H₁₈) is -57 °C. (a) Is the freezing of n-octane an endothermic or exothermic process?
122
views
Multiple Choice
Two compounds were dissolved in water and mixed together. A precipitate formed, and the test tube got very warm. Based on this information, which of these statements is true?
201
views
Multiple Choice
547 J of thermal energy is added to a 200.0 g sample of iron that is initially at 68.0 °C. If the specific heat capacity of iron is 0.449 J/g°C, what will be the final temperature in °C?
251
views
Multiple Choice
A 1.720 g sample of naphthalene (C10H8) undergoes combustion in a bomb calorimeter, causing the temperature to rise from 24.00°C to 47.57°C. If the heat capacity of the calorimeter is 2940 J/°C, what is the enthalpy of combustion of naphthalene in kJ/mol?
347
views
Multiple Choice
A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO3 in a coffee cup calorimeter. If both solutions were initially at 35.00°C and the temperature of the resulting solution was recorded as 37.00°C, determine the ΔH°rxn (in kJ/mol) for the neutralization reaction.
327
views
Multiple Choice
A 25.0 g piece of aluminum (which has a molar heat capacity of 24.03 J/mol °C) is heated to 85.1 °C and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/g °C) initially at 25.0 °C. Assuming no heat is lost to the surroundings, what is the final temperature of the system?
348
views
Multiple Choice
After adding the NaOH to the H2SO4 solution, the temperature of the mixture increases to 32.5°C. What type of reaction is occurring in the coffee cup?
174
views