8. Thermochemistry

When iron metal is mixed with hydrochloric acid in a coffee cup calorimeter, the temperature rises from 25.2°C to a final temperature. What type of reaction is occurring?

In the presence of excess oxygen, methane gas burns in a constant-pressure system to yield carbon dioxide and water: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) with ΔH = -890.0 kJ. Calculate the value of q (kJ) in this exothermic reaction when 1.70 g of CH4 is burned.

Which of the following best describes an exothermic reaction?

Which of the following best describes an endothermic change?

In which of the following scenarios is chemical energy being transformed into thermal energy?

Which statement best describes the difference between an exothermic reaction and an exergonic reaction?

If you were to touch a flask in which an exothermic reaction is occurring, what would you most likely feel?

Which of the following changes of state results in a decrease in the kinetic energy of the particles?

Energy is released as a result of which of the following chemical reactions?

Which one of the following processes is endothermic?

Which of the following steps in the formation of a solution is exothermic?

Which type of chemical reaction absorbs heat energy from its surroundings?

Which type of reaction occurs when energy is absorbed during the process?

The temperature rises from 25.00°C to 29.00°C when 3.50 g of sucrose (C12H22O11, molar mass 342.3 g/mol) undergoes combustion in a bomb calorimeter. Calculate ΔE for the combustion of sucrose in kJ/mol sucrose, given that the heat capacity of the calorimeter is 4.50 kJ/°C.

Which one of the following processes is exothermic?