Investigation 8: Thermochemistry

Front

What unit do you use to measure Thermal Energy?

Back

J (Joules)

Front

Is the combustion of gasoline endothermic or exothermic?

Back

Exothermic

Front

If a reaction in a beaker starts at 15.0 degrees Celsius and ends at 27.5 degrees Celsius, is the system endothermic or exothermic?

Back

Endothermic

Front

How much energy must be used to produce 4.75 mole of gaseous water? H2O (l) + 44.0 kJ --> H2O (g)

Back

207 kJ

Front

How much energy would be produced if only 1 mole of nitrogen was reacted in the reaction 2N2 + 3H2 --> 2NH3 + 46 kJ?

Back

23 kJ

Front

What is Thermochemistry?

Back

The study of the heat energy associated with chemical reactions and changes of state.

Front

Define Endothermic Reaction.

Back

A reaction that absorbs heat from its surroundings.

Front

Define Exothermic Reaction.

Back

A reaction that releases heat to its surroundings.

Front

What is the formula for calculating heat energy (q)?

Back

q = m * c * ΔT, where m is mass, c is specific heat capacity, and ΔT is the change in temperature.

Front

What does ΔT represent in thermochemistry?

Back

ΔT represents the change in temperature, calculated as final temperature - initial temperature.