Chapter9edit - Chemistry in Focus 3rd edition Tro Chapter 9...

Info icon This preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry in Focus 3rd edition Tro Chapter 9 Energy for Today
Image of page 1

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

View Full Document Right Arrow Icon
Molecules in Motion A burn is the transfer of energy (too much of it for comfort) from a hot object to the human body. The atoms and molecules are in constant motion. The hotter an object is, the faster its molecules move.
Image of page 2
Fundamental Concepts Heat is the flow of energy due to a temperature difference. Energy, and our use of it, is ultimately tied to molecular motion. We use energy to move atoms and molecules in a nonrandom or orderly motion. This use of energy is called WORK.
Image of page 3

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

View Full Document Right Arrow Icon
Reliance on Energy Without it, our most common tasks become impossible.
Image of page 4
The average U.S. citizen enjoys the energy output of 120 people at the flip of a switch or the push of a pedal.
Image of page 5

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

View Full Document Right Arrow Icon
Energy Vocabulary Thermodynamics – the study of energy and its transformation from one form to another Energy – the capacity to do work Work – a force acting over a distance Total energy of an object – the sum of its kinetic energy (motion) and its potential energy (position)
Image of page 6
Vocabulary (continued) Thermal energy – the energy associated with the temperature of an object System – the subject we are thermodynamically studying Surroundings – the environment in which the system is exchanging energy
Image of page 7

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

View Full Document Right Arrow Icon
The First Law of Thermodynamics Energy can neither be created nor destroyed, only transferred between the system and the surroundings. An exception occurs in nuclear processes where mass and energy are interchangeable as E = mc 2 .
Image of page 8
Implications of the First Law We cannot create energy that was not there to begin with; a device that continuously produces energy, without the need for energy input, cannot exist.
Image of page 9

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

View Full Document Right Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern