Exam (elaborations)

Chemistry 103 Module 2Exam Questions and Answers Latest 2025/2026 COMPLETE FREQUENTLY MOST TESTED QUESTIONS WITH COMPLETE SOLUTION /GET IT 100% ACCURATE!(Graded A+)

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Chemistry 103 Module 2Exam Questions and Answers Latest 2025/2026 COMPLETE FREQUENTLY MOST TESTED QUESTIONS WITH COMPLETE SOLUTION /GET IT 100% ACCURATE!(Graded A+) Chemistry 103 Module 2Exam Questions and Answers Latest 2025/2026 COMPLETE FREQUENTLY MOST TESTED QUESTIONS WITH COMPLETE SOLUTION /...

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chemistry 103 module 2
chemistry 103
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chemistry 103 module 2exam questions and answers
chemistry 103 module 2exam

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Chemistry 103 Module 3 Exam Study g g g g g

Questions and Verified Answers / A+ Grade g g g g g g

1. 3.1 THERMOCHEMISTRY
g

Ans> Thermodynamics is the study of the relationship
g g g g g g g

between heat and other forms of energy, particularly mechanical work. Thermo-
g g g g g g g g g g

chemistry is the part of thermodynamics that deals with the quantity of heat given off or a
g g g g g g g g g g g g g g g g g

bsorbed during a chemical reaction. The quantity of heat given off or absorbed during a
g g g g g g g g g g g g g g g

physical change or temperature change can also be studied, and we will refer to this pro
g g g g g g g g g g g g g g g

ess as calorimetry.
g g

2. System

Ans> the object (or substance) being studied
g g g g g g

3. Open system g

Ans> a system that permits the transfer of mass and energy with the surroundings
g g g g g g g g g g g g g

4. Closed system g

Ans> a system that permits the transfer of energy but not mass with the surroundings
g g g g g g g g g g g g g g

5. Isolated system g

Ans> a system that does not permit the transfer of energy or mass with the surroundi
g g g g g g g g g g g g g g g

1g/g1
9

,ngs

6. Surroundings

Ans> the rest of the universe interacting with the system
g g g g g g g g g

7. Energy

Ans> the potential or capacity to move matter
g g g g g g g

Ans> the ability to do work (unit is J
g g g g g g g g

= joule)
g

8. Work

Ans> the amount of energy transferred by a force acting through a distance
g g g g g g g g g g g g

9. Kinetic energy g

Ans> the energy possessed by an object by virtue of its motion (unit is J = joule)
g g g g g g g g g g g g g g g g

10. Potential energy g

Ans> the energy possessed by an object by virtue of its position (unit is J = joule)
g g g g g g g g g g g g g g g g

11. Heat (q) g

Ans> the thermal energy transferred between system and surroundings due to a differe
g g g g g g g g g g g g

nce in temperature between them (unit is J = joule)
g g g g g g g g g

12. Enthalpy

Ans> the total energy of a system
g g g g g g

13. Heat of reaction g g

2g/g1
9

,Ans> (”H) the amount of heat (q) gained or lost during a chemical reaction
g g g g g g g g g g g g g

14. Exothermic

Ans> a reaction with a - ”H
g g g g g g

15. Endothermic

Ans> a reaction with a + ”H (absorb heat)
g g g g g g g g

16. Calorimetry

Ans> The energy change that accompanies a physical, temperature, or chemical change
g g g g g g g g g g g

is determined by carrying out the process in a device known as a calorimeter. The calori
g g g g g g g g g g g g g g g

meter is able to measure the amount of heat absorbed or evolved as a process takes plac
g g g g g g g g g g g g g g g g

e. A styrofoam coffee cup calorimeter can be used to measure an energy change that tak
g g g g g g g g g g g g g g g

es place at constant pressure. An enclosed bomb calorimeter is used to measure an ener
g g g g g g g g g g g g g g

gy change that takes place at constant volume with a change in pressure.
g g g g g g g g g g g g

17. Temperature change calorimetry g g

Ans> measures the thermal energy change oc-
g g g g g g

g curring as a system at higher temperature transfers kinetic energy to a system at lower
g g g g g g g g g g g g g g

temperature, which is reflected by a change in temperature for the overall sys-
g g g g g g g g g g g g

g tem. This is demonstrated below by adding a 15.6 gram piece of aluminum (heated
g g g g g g g g g g g g g

3g/g1
9

, to 100oC) to a 45.6 gram sample of water at 26.7oC in a coffee cup calorimeter.The
g g g g g g g g g g g g g g g g

final temperature of this system can be predicted using the equations below and sever
g g g g g g g g g g g g g

al facts about the materials (Al and H2O).
g g g g g g g

Heat temp change = qtemp change = mass x specific heat (heat capacity) x temp chang
g g g g g g g g g g g g g g g

e=mxcx t g g g g g gg

(mAl x cAl x tAl) = (mH2O x cH2O x tH2O)
g g g gg g g g g g gg

However, since the Al is losing heat, we'll use a negative sign in front of the heat loss equati
g g g g g g g g g g g g g g g g g g

on.

- (mAl x cAl x tAl) = (mH2O x cH2O x tH2O)
g g g g gg g g g g g gg

We know t = Tempmixture - Tempinitial, so we can substitute the data to get
g gg g g g g g g g g g g g g

Ans>

- [15.6 g x 0.899 J/g oC x (Tmix - 100oC)] = [(45.6 g x 4.184 J/g oC x (Tmix - 26.70oC)]
g g g g g g g g g g g g g g g g g g g g g

Now, solve g

Ans>

4g/g1
9

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Exam (elaborations)

Chemistry 103 Module 2Exam Questions and Answers Latest 2025/2026 COMPLETE FREQUENTLY MOST TESTED QUESTIONS WITH COMPLETE SOLUTION /GET IT 100% ACCURATE!(Graded A+)

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