CHE K121 Lecture 14: L14C5 Thermochemistry

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fuchsiabeaver131

15 Oct 2018

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Thermochemistry: thermochemistry is the study of chemical reactions and the energy changes that involve heat, chemical energy is mainly potential energy (electrostatic) (! = j (joule = kg * m2 s2 ) Wednesday, october 10, 2018: attraction between ions, electrostatic attraction is seen between oppositely charged ions, energy is released when chemical bonds are formed; energy is consumed when chemical bonds are broken. First law of thermodynamics: energy can be converted from one form to another, but it is neither created nor destroyed, sytem and surroundings, system: the portion of the universe that we focus on, surroundings is everything else. Isolated system: a region of the universe that can not exchange heat or mass with its surroundings. Internal energy of a system is the sum of all kinetic and potential energies of all components of the system; we us e to represent it.

Related Questions

1) What is the objective of this experiment? (Name of the experiment Introduction to Calorimetry)

A) To redefine Hess' Law.

B) To measure the light emitted from the reaction solution.

C) To measure the enthalpy of several acid-base reactions and to use these enthalpies along with Hess' law to determine the enthalpy of an acid base reaction not performed in the laboratory.

D)To study some of the properties of nable gases and thier reaction to acidic environments.

2) What is the SI unit for heat ?

A) Gallons.

B) Grams.

C) Moles.

D) Joules.

3) Which of the following has the units: J/gK?

A) Endothermic.
B) Specfic heat.
C) Enthalpy.
D) Heat capacity.

4) How would you define Specfic Heat (c)?

A) The amount of energy required to raise a mass one degree Celcius ( or Kelvin).

B) The change in temperature that occurs from one gram of substance releasing one Joule of energy.

C) The amount of heat required to raise one gram of a substance one degree Celcius (or Kelvin).

D) The amount of mass required to release one Joule of energy.

General Chemistry I

1.) Which statement isincorrect?

(a) Energy is the capacity todo work or to transfer heat.

(b) Kinetic energy is theenergy of motion.

(d) A process that absorbsenergy from its surroundings is called exothermic.

(e) The Law of Conservation of Energy is another statement of the FirstLaw of Thermodynamics.

2. Which of the following statementsabout the first law of thermodynamics and energy is false?

(a)Kinetic energy cannot be convertedto potential energy.

(b)Kinetic energy =1/2mv².

(c)All the energy in the universe isconserved.

(d)A system can never decrease itsenergy.

(e)Potential energy is the energy ofposition or composition.

3. Whichone of the following thermodynamic quantities isnot a state function?

(a)work (b) enthalpy (c)entropy (d) internalenergy (e) free energy

CHE K121 Lecture 14: L14C5 Thermochemistry

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