CH110-120 Chapter 3 Lecture Notes

CH110-120 Chapter 3 Lecture Notes - Chapter 3 Energy and...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 3 – Energy and its Conservation 3.1 Types of Energy 3.2 Thermodynamics 3.3 Energy Changes in Chemical Reactions 3.4 Measuring Energy Changes: Calorimetry 3.5 Enthalpy 3.6 Energy Sources
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3.1 Types of Energy Energy – the ability to do work has a unit of Joules 1. Kinetic Energy 2. Potential Energy: a. Electrical b. Chemical c. Mass 3. Thermal Energy 4. Radiant Energy Energy – the ability to do work has a unit of Joules 1. Kinetic Energy 2. Potential Energy: a. Electrical b. Chemical c. Mass 3. Thermal Energy 4. Radiant Energy W = Fd force and displacement Unit of force: Neutons 1N = 1kg.m/s 2 Displacement Unit = m W = kg m 2 /s 2 = mv 2
Background image of page 2
Kinetic Energy Every moving object has kinetic energy because it results from the movement of objects. It is dependent on the velocity (v) and mass (m) of an object. Joule (J): the SI unit of energy 2 kinetic 1 E mv 2 = 2 2 s m kg 1 J 1 joule 1 = =
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Potential Energy Electrical Energy - energy from positive and negative ions held a small distance apart q 1 and q 2 are the charges of two ions, r is the distance between the ions in pm k =2.31 x 10 -16 J pm 1 2 electrical q q E = k r picometres
Background image of page 4
Potential Energy Chemical Energy: energy resulting from attraction of the electrons and nuclei in molecules (bond energy) Mass: transformation of mass into energy ( E = mc 2 ) H-H The electron in one atom is attracted to the nucleus of the other atom Nuclear process
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Thermal and Radiant Energy Thermal Energy : the total energy of random movements of molecules Radiant Energy : energy as a result of electromagnetic radiation. Energy constant of a hot object (heat) movement of molecules: 1.Vibrational 2.Rotational 3.Translational: basically an object moving (for a gas, E kin = 3RT/2N A ) light
Background image of page 6
Energy Transfer and Transformations Energy can be transferred from one type to another. Energy transformations accompany chemical reactions.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3.2 Thermodynamics The study of energy transfers and transformations “how much energy goes where” Terms: System : whatever we want to describe and study by itself. Surroundings : everything else but the system Boundary : - what separates the system from its surroundings
Background image of page 8
Conservation of Energy Energy is neither created nor destroyed in any process, although it may be transferred from one body to another or transformed from one form into another OR RESTATED Energy may be transferred as work or heat, but no energy can be lost, nor can heat or work be obtained from nothing.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Heat Thermal energy that is exchanged with its surroundings is referred to as heat (q). It is measured in units of joules (J). Heat flow is associated with a change in temperature (ΔT)
Background image of page 10
Heat Flows and Temperature 1. ∆ T depends on q, the amount of heat transferred. 2. ∆
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/14/2011 for the course CHEM 110 taught by Professor Maly during the Fall '10 term at Wilfred Laurier University .

Page1 / 44

CH110-120 Chapter 3 Lecture Notes - Chapter 3 Energy and...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online