Homework Answers
Exothermic means heat is produced, so heat is lost from system to surrounding, sign for q(heat) is negative.
Endothermic means heat is gained by the system from the surrounding and as per sign convention it is taken as positive
Exothermic changes: the system loses heat to
the surrounding. The heat gained by the
surroundings increases the freedom of motion of
the particles which increases the entropy of the
surroundings. Therefore, qsys less than
0. qsurrgretater than
0 and surrgretater
than 0.
Endothermic changes: the system gains heat from
the surrounding. The heat lost by the surroundings
decreases the freedom of motion of the particles
which decreases the entropy of the surroundings.
Therefore, qsys greater than 0.
qsurrless than 0 and surr less
than 0.
l
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lete the following sentences about endothermic and exothermic changes. gains heat from loses heat to equal...
Please explain Heat Transfer and Changes in the Entropy of the Surroundings. Below are key questions....
Please explain Heat Transfer and Changes in the Entropy of the Surroundings. Below are key questions. 1. Know and understand that the entropy change for the universe is defined in terms of the entropy change for the system and the entropy change for the surroundings. 2 .Know that a process in which the system’s entropy decreases can still be spontaneous depending on the degree to which the surroundings’ entropy changes. 3. Know and understand that an exothermic process increases the...
The easiest way to determine whether a process is exothermic or endothermic is to note the...
The easiest way to determine whether a process is exothermic or endothermic is to note the change in temperature in a calorimeter; a positive temperature change indicates an exothermic process while a negative temperature change indicates an endothermic process. Select the Experiment tab in the Simulation, and then click Run Demonstration. Perform the described tasks while specifically focusing on the third demonstration, where LiCl is dissolved in water, paying attention to the temperature change and the microscopic view. Match the...
Match the words in the left column to the appropriate blanks in the sentences on the...
Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. gains 1.Drag the beaker of water onto the support. The internal energy of water will be analyzed, which makes water the exothermic being studied loses 2. When the slider is dragged down to cool the water, the water thermal energy to the ice, and the ice is system considered part of the endothermic...
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b...
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b only C) c only D) bandc E) a and 33) The value of AH' for the reaction below is - 790 kl. The enthalpy change accompanying the reaction of 0.95 g of Sis_ k 33) 25 (s) + 302 (9) -2503 (9) A) 12 B) 23 C) -23 D) - 790 E) -12 34) The value of AH' for the...
Justify the following sentences by answering (T) for TRUE or (F) for FALSE. (1 mark each)...
Justify the following sentences by answering (T) for TRUE or (F) for FALSE. (1 mark each) AE is independent on the initial and final state of a system. The sum of entropy changes of the system and surroundings is always positive. The ratio of numerical values of partial pressures of the reaction participants is unitless. Q is small if products pressures are small, a large Q means a negative or good (favorable) contribution to the free energy For pure solids...
Lab 9 Heat of Reaction OBJECTIVE: To experimentally determine the heat of reaction for two exothermic...
Lab 9 Heat of Reaction
OBJECTIVE:
To experimentally determine the heat of reaction for two
exothermic reactions.
DISCUSSION:
The heat given off or gained in a reaction is called the heat
of reaction (∆?????????).
A reaction that releases heat is known as an exothermic
reaction; an endothermic reaction
is one that absorbs heat.
The heat of the reaction corresponds to one mole of the
reactant and is expressed in
kilocalories per mole of reactant or in kilojoules per mole of...
Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. gains 1.Drag the beaker of water onto the support. The internal energy of water will be analyzed, which makes water the exothermic being studied loses 2. When the slider is dragged down to cool the water, the water thermal energy to the ice, and the ice is system considered part of the endothermic...
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b only C) c only D) bandc E) a and 33) The value of AH' for the reaction below is - 790 kl. The enthalpy change accompanying the reaction of 0.95 g of Sis_ k 33) 25 (s) + 302 (9) -2503 (9) A) 12 B) 23 C) -23 D) - 790 E) -12 34) The value of AH' for the...
Justify the following sentences by answering (T) for TRUE or (F) for FALSE. (1 mark each) AE is independent on the initial and final state of a system. The sum of entropy changes of the system and surroundings is always positive. The ratio of numerical values of partial pressures of the reaction participants is unitless. Q is small if products pressures are small, a large Q means a negative or good (favorable) contribution to the free energy For pure solids...
Lab 9 Heat of Reaction
OBJECTIVE:
To experimentally determine the heat of reaction for two
exothermic reactions.
DISCUSSION:
The heat given off or gained in a reaction is called the heat
of reaction (∆?????????).
A reaction that releases heat is known as an exothermic
reaction; an endothermic reaction
is one that absorbs heat.
The heat of the reaction corresponds to one mole of the
reactant and is expressed in
kilocalories per mole of reactant or in kilojoules per mole of...
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