energy transformations
Download
Skip this Video
Download Presentation
Energy Transformations

Loading in 2 Seconds...

play fullscreen
1 / 25

Energy Transformations - PowerPoint PPT Presentation


  • 836 Views
  • Uploaded on

Energy Transformations. Georgia High School Graduation Test: Science Review Mrs. Kirby. Introduction. From the key vocabulary, circle the words that you can already define or use in a sentence. Write down two or three things that you think are important for you to know today.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Energy Transformations' - victoria


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
energy transformations

Energy Transformations

Georgia High School Graduation Test:

Science Review

Mrs. Kirby

introduction
Introduction
  • From the key vocabulary, circle the words that you can already define or use in a sentence.
  • Write down two or three things that you think are important for you to know today.
sample question
Sample Question
  • Describe the process of radioactive decay in which the unstable nucleus of a radioactive isotope spontaneously decays.
radioactivity
Radioactivity
  • the spontaneous process that occurs when an unstable nucleus releases particles and/or energy to form a more stable nucleus
radioisotopes
Radioisotopes
  • unstable radioactive nucleus
  • examples:
    • carbon-14
    • deuterium (hydrogen with 1 neutron)
    • all elements with atomic numbers above 83
radioactive decay
Radioactive Decay
  • radioactive decay = the release of subatomic particles by radioactive isotopes
  • alpha and beta decay result in transformed atom
  • gamma decay results in same atom with release of energy

ALPHA DECAY

BETA DECAY

GAMMA DECAY

sample question7
Sample Question
  • Calculate the amount of radioactive substance that will remain after one half-life.
half life
Half-life
  • the time it takes for half of the radioactive particles in a radioactive nucleus to decay
  • example:
    • If an original sample of carbon-14 has a mass of 10 grams and its half-life is 5700 years, how many grams of carbon-14 would remain after one half-life?
      • ANSWER: 5 grams
sample question9
Sample Question
  • What is the effect of an increase in temperature on the motion of atoms?
temperature
Temperature
  • a measure of the average kinetic energy of molecules
  • the higher the temperature, the faster the molecules
sample question11
Sample Question
  • Compare solids, liquids, and gases in terms of shape, volume, and movement of particles.
sample question13
Sample Question
  • What is the effect of temperature change on the phases of matter?
phase changes
Phase Changes
  • to increase the temperature of a substance energy must be absorbed by that substance
  • to decrease the temperature of a substance energy must be released by that substance
sample question17
Sample Question
  • Give examples and describe the two forms of energy encountered in a system between any of the following: chemical, heat, light, electrical, and mechanical.
types of energy
Types of Energy
  • potential energy = stored energy due to position or chemical composition
  • kinetic energy = energy due to motion
heat energy
Heat Energy
  • Heat can be transferred through:
    • Conduction = when objects touch
    • Convection = when matter moves
    • Radiation = in the form of waves (does not require matter)
  • Conductors = easily transmit energy
    • Example: metals
  • Insulators = do not easily transmit energy
    • Example: gases such as air
conversion of energy
Conversion of Energy
  • The sum of KE and PE is constant if there is no friction.
  • Realistically, some energy is transferred to heat due to the friction between the wheels and the track.
discussion
Discussion
  • The molecular theory of molecules states that the velocity of molecules correlates to the temperature of the system. How are the actions of a group of people affected by the temperature of a room? How are those actions similar to and different from atoms at the same temperature?
lesson summarized
Lesson Summarized
  • Write a sentence that explains the system discussed.
  • Draw a graphic organizer that shows the relationship of the parts to the whole.
short quiz answers
Short Quiz Answers
  • Half-time is the time it takes for half of the radioactive particles in a radioactive nucleus to decay.
  • All isotopes have the same atomic number but different atomic masses.
  • Some isotopes are radioactive due to the different number of neutrons.
  • See the table on sources of energy.
  • Ice, water, and steam all have the same chemical composition (H2O) but each are in a different phase.
more practice
More Practice
  • From the blue book, complete the following questions:
    • p.53 (26,27,30)
    • p.61 (1-4)
    • p.62-63 (6-8)
    • p.64 (11-14)
    • p.68 (21-25)
ad