Tuesday
September 30, 2014

Homework Help: Chemistry

Posted by jeje on Monday, March 14, 2011 at 10:17pm.

1. A bottle of juice at room temperature is placed in a bucket of ice inside a box. The box, bottle, and bucket of ice represent a closed system. Which of the following statements is true? (2.0 points) (Points : 2)
Heat flows from the ice to the juice while the total energy of the system remains the same.
Heat flows from the juice to the ice while the total energy of the system increases.
Heat flows from the ice to the juice while the total energy of the system decreases.
Heat flows from the juice to the ice while the total energy of the system remains the same.


2. The standard enthalpy for a reaction is -598 kJ/mol. The reaction can be described as: (2.0 points) (Points : 2)
exothermic, releasing energy into the environment.
endothermic, releasing energy into the environment.
exothermic, absorbing energy from the environment.
endothermic, absorbing energy from the environment.


3. What is the difference between heat and temperature? (2.0 points) (Points : 2)
Heat is thermal energy, while temperature is the measurement of average kinetic energy of the particles of matter.
Temperature is thermal energy, while heat is the measurement of average kinetic energy of the particles of matter.
Temperature measures thermal energy, while heat measures molecular energy.
There is no difference between heat and temperature.


4. When a student reacts phosphoric acid and water, she notices that the container feels warm. What makes the container feel warm? (2.0 points) (Points : 2)
The reaction is exothermic and gives off heat energy.
The reaction is exothermic and absorbs heat energy.
The reaction is endothermic and gives off heat energy.
The reaction is endothermic and absorbs heat energy.


5. What is meant by entropy? (1.0 points) (Points : 1)
Heat of formation
Temperature of condensation
Degree of randomness and disorder
The absolute temperature of evaporation

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