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Questions and Answers
What are the units for heat energy measured in joules?
What are the units for heat energy measured in joules?
- kg·m/s
- kg·m²/s
- kg·m²/s² (correct)
- J/s
Which is the definition of an intermediate in a consecutive reaction?
Which is the definition of an intermediate in a consecutive reaction?
- The final product of a chemical reaction
- A catalyst that speeds up the reaction
- A product that is formed and consumed within the same reaction sequence (correct)
- A reactant that is present in excess during a reaction
What is the heat capacity of the bomb calorimeter if it releases 3088 kJ and raises temperature by 140.0 °C?
What is the heat capacity of the bomb calorimeter if it releases 3088 kJ and raises temperature by 140.0 °C?
- 1.25 kJ/°C
- 4.53 kJ/°C
- 22.1 kJ/°C (correct)
- 432 kJ/°C
How much heat is required to raise the temperature of 175 g of aluminum from 21.0°C to 145°C?
How much heat is required to raise the temperature of 175 g of aluminum from 21.0°C to 145°C?
Which of the following describes a consecutive reaction?
Which of the following describes a consecutive reaction?
What is the final temperature after mixing 250 g of coffee and a mug of specific heat 0.80 J/g°C?
What is the final temperature after mixing 250 g of coffee and a mug of specific heat 0.80 J/g°C?
What work is done by H2 when it expands against a constant pressure of 75 atm?
What work is done by H2 when it expands against a constant pressure of 75 atm?
How much heat is evolved during the complete combustion of 12.5 L C3H8(g) at specific conditions?
How much heat is evolved during the complete combustion of 12.5 L C3H8(g) at specific conditions?
Flashcards
Joules units
Joules units
The standard unit of energy in the International System of Units (SI).
Consecutive Reaction
Consecutive Reaction
A series of reactions where the product of one reaction becomes a reactant for the next.
Intermediate in a consecutive reaction
Intermediate in a consecutive reaction
A substance produced in one step of a consecutive reaction and consumed in a subsequent step.
Heat to raise temperature (aluminum)
Heat to raise temperature (aluminum)
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Final Temperature (coffee + mug)
Final Temperature (coffee + mug)
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Heat Capacity of Calorimeter
Heat Capacity of Calorimeter
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Heat of Combustion
Heat of Combustion
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Work done by a system (expanding)
Work done by a system (expanding)
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Complete combustion of propane
Complete combustion of propane
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Hess's Law
Hess's Law
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Study Notes
Week 1 Worksheet Review
- Joules: Units for energy
- Consecutive Reaction: A series of reactions where one product in the first reaction is a reactant in the second reaction
- Intermediate: A product formed in one step of a reaction, but consumed in a later step
Heat Calculations
- Specific Heat of Aluminum: Calculate the heat needed to change the temperature of a known mass of aluminum
- Coffee and Mug: Calculate the final temperature when hot coffee is placed in a mug using specific heat
Calorimetry
- Bomb Calorimeter: Used to measure the heat of combustion of a substance
- Nitrobenzene Combustion: Determine the heat capacity of a bomb calorimeter by measuring the temperature change during nitrobenzene combustion
First Law of Thermodynamics
- Work Done: Determine the work done by a gas expanding against a constant external pressure
Heats of Reaction (ΔH)
- Combustion of Propane: Calculate the heat released in the combustion of a given volume of propane, considering the balanced equation and the standard enthalpy change
Indirect Determining ΔH: Hess's Law
- Methanol Combustion: Using Hess's law, calculate the enthalpy change of a reaction by combining known enthalpy changes in different reactions. Calculations involve determining the ΔH for combustion of methanol using other known enthalpy changes.
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