Thermochemistry Jeopardy!

Definitions

100

When the exchange of energy stops because the system and the surroundings reach the same temperature

Thermal equilibrium

200

A proportionality constant which is the quantity of heat required to change the temperature of 1 gram of substance by 1°C

Specific heat capacity

300

The amount of heat that is released/absorbed in a chemical reaction under constant pressure

Enthalpy

400

A set of conditions such that a gas is at 1 atm, a solution is 1 M concentration, and the temperature is 25°C

Standard state

500

The result of a force acting through a distance

Work

Conceptual Connection

100

The concept that energy cannot be created or destroyed

The concept that energy cannot be created or destroyed

200

How does a positive value for work relate to the volume of the system?

Smaller volume

300

Standard State indicates what 3 conditions:

Pressure: 1 atm

Specified Temperature: Usually 25 C

Concentration: 1 M

400

What is the difference between ∆E and ∆H ?

∆E includes work

500

If a chemical equation can be expressed as a sum of a series of steps, then the ∆H_rxn of the overall reaction is the summation of the heat of reactions for each step. This is known as what principle:

Hess’s Law

Name That Symbol

100

q_rxn

Heat of a Reaction

200

∆ E_sys

Energy of a system

300

∆T

Change in temperature

400

C_cal

Specific heat capacity of a bomb calorimeter

500

∆H_f^°

Specific heat capacity of a bomb calorimeter

Equations

100

1/2 _* mass _* velocity²

Kinetic Energy

200

q + w

Internal Energy

300

What equals mass _* C_{s *} ∆T ?

Heat

400

This equation is used in what circumstance?

q_soln = m_{soln *} C_{s,soln *} ∆T

Coffee cup calorimetry

500

This equation is used in what circumstance?

q_cal = C_{cal *} ∆T

Bomb Calorimetry

Calculations

100

When conducting coffee cup calorimetry, a metal was dissolved in acid and the heat of solution was calculated to be q_soln = 3000J. What was the heat of the reaction, q_rxn (dissolving the metal)?

-3000J

200

Calculate the ∆H_rxn for the reaction A + B --> 2C given the following reaction and it’s ∆H:

 2C --> A + B            ∆H_rxn = 500 kJ

-500kJ

300

How much work (in J) is required to expand the volume of a pump from 0.0 L to 2.5 L against an external pressure of 1.1 atm?

-280 J

400

How much heat is required to warm 152 g of sand from 10.0°C to 50.0°C? For sand, C_s = 0.84 J/g °C

51100 J

500

Charcoal is primarily carbon. What mass of CO₂ is produced if you burn enough carbon charcoal to produce 500. kJ of heat?

C_(s) + O_2(g) --> CO_{2 (g)}  ∆H_rxn = -393.5 kJ

55.9 g