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Matter and Energy

Matter and Energy. Energy . The capacity to do some kind of work, such as moving an object, forming a new compound, or generating light. Physical Change. Affects only the physical properties of matter. E.g.-when ice melts or water turns to steam. Chemical Change.

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Matter and Energy

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  1. Matter and Energy

  2. Energy • The capacity to do some kind of work, such as moving an object, forming a new compound, or generating light.

  3. Physical Change • Affects only the physical properties of matter. • E.g.-when ice melts or water turns to steam

  4. Chemical Change • Occurs whenever a new substance is made • Like when the gases hydrogen and oxygen make water

  5. Changes in Matter • Every change in matter involves a change in energy. • Evaporation occurs when enough energy is absorbed by a liquid that it becomes a gas.

  6. Endothermic reaction • Describes a process in which heat is absorbed from the environment. • Example-like when alcohol evaporates and feels cool.

  7. Exothermic reaction • Describes the process in which a system releases heat into the environment. • For instance Thermacare pads

  8. Law of Conservation of Energy • The law that states that energy cannot be created or destroyed but can be changed from one form to another. • Like photosynthesis-which changes light energy into sugar energy

  9. Heat • The energy transferred between objects that are at different temperatures. • Energy is always transferred from objects of higher temperatures. • Like when warm air touches your skin

  10. Kinetic Energy • The energy of an object that is due to the object’s motion. • Like a car speeding down the highway.

  11. Temperature • A measure of how hot or how cold something is. • Can be measured by the Fahrenheit, Celsius or Kelvin scale.

  12. Specific Heat • The quantity of heat required to raise a unit mass of homogeneous material 1g of a substance 1 degree Kelvin in a specified way given constant pressure and volume. • Expressed in joules per gram Kelvin (J/gK)

  13. Scientific Method • The procedures used as a strategy for drawing sound or true conclusions. • A guideline for solving problems in science.

  14. Hypothesis • A proposed explanation for an observation • A reasonable and testable explanation for a problem or question • An educated guess

  15. Theory • Any hypothesis that withstands repeated testing • A well-tested explanation for an observation

  16. Law • A statement or mathematical expression that reliably describes the cause of certain events in the natural world • Describes events

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