What is the law that states that energy can not be created nor destroyed
100
Calculate the heat absorbed of a 175 g sample that starts at 23.45 degrees Celsius, raises to 26.85 degrees Celsius and has a specific heat of 4.284 G/gC
What is 2.49 x 10^3 J
200
A piece of equipment designed to measure for reactions at constant volume
What is bomb calorimeter
200
Equation for delta E for a reaction
HINT: Bomb Calorimeter
q = heat capacity * [delta]T
200
Equation relating system and surrounding
What is [delta]E (system) = -[delta]E surrounding
200
What is an exothermic reaction?
What is a chemical reaction that loses heat to its surroundings
200
Find ΔHrxn for the following reaction:
N2 + 2 O2 → 2 NO2
Based on the following data.
2 NO → N2 + O2 ΔH = –180 kJ
2 NO + O2 → 2 NO2 ΔH = –112 kJ
What is 68 kJ
300
Define Specific Heat
What is the amount of heat required to raise the temperature of 1 gram of a substance 1 degree Celsius
300
Equation for heat (q) of a OSU calorimeter
What is q = mass * SH * delta T
300
The sum of the kinetic and potential energies of all of the parties that compose the system [delta] E
What is internal energy
300
What is an endothermic reaction?
What is a chemical reaction that absorbs heat from its surroundings
300
Find the standard enthalpy of formation:
CH4(g) + 2 O2(g) ---> CO2(g) + 2 H2O(l)
CH4 (g): -74 kJ
CO2 (g): -393.5 kJ
H2O (l): -285.8 kJ
What is -891.1 kJ
400
The change in enthalpy when one mole of the compound forms from its constituent elements in their standard states
What is standard enthalpy of formation
400
When is [delta]H equal to [delta]E?
What is when any reaction that occurs does NOT involve gasses
400
Energy associated with a reaction at constant volume and energy associated with a reaction at constant pressure
What is internal energy, [delta]E and what is enthalpy, [delta]H
400
What are the signs of [delta H] of an exothermic reaction and an endothermic reaction?
What is negative for exothermic and positive for endothermic
400
100.0 g of nickel at 150 degrees C was placed in 1.00 L of water at 25 degrees Celsius. The final temperature of the water was 26.3 degrees Celsius. What is the specific heat of nickel?
What is 0.44 J/g*C
500
If a chemical equation can be expressed as the sum of series of steps, then [delta]H (rxn) for the overall equation is the sum of the heats of the reactions for each step
What is Hess' Law
500
When is [delta]E different from [delta]H?
What is when a gas is involved
500
Energy associated with a reaction at constant pressure
What is enthalpy, delta H
500
Difference between system and surrounding
What is the portion of the universe we single out for study and which has a boundary vs everything else in the universe