8th grade - science

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8th grade - science

• Changes in Matter

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• What is an example of a chemical change?

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• Baking a cake

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• Energy that comes from the chemical bonds is
  called

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• Chemical energy

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• What is a liquid?

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• No definite shape
• Definite volume

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• What is freezing?

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• The change from a liquid to a solid-opposite of
  melting

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• Particles of a liquid

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• are free to move throughout a container but
  remain in close contact with one another

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• What is a solid?

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• Definite shape
• Definite volume

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• In which state of matter do the particles spread
  apart and fill all the spaces available to them?

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• gas

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• What is pressure?

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• The force of a gass outward push divided by the
  are of the walls of the container

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• What is Boyles law?

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• States when the pressure of a gas increases at
  constant temperature, the volume of the gas
  decreases

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• The greater the speed of gas particles in a
  container

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• The greater the pressure

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• Charles Law

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• When the temperature of a gas increases at
  constant pressure, its volume increases

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• When the temperature of a gas decreases at
  constant volume,,,

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• The pressure decreases

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• What happens to an inflated balloon in cold air?

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• Volume decreases

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• What is a physical change?

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• A change that alters the form of a substance
  without changing it in to another substance
• Ex ice melting

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• What is a chemical change?

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• It creates a different substance with different
  properties

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• What is thermal energy?

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• Energy a substance has from the movement of its
  particles

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• What is the law of conservation of energy?

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• The total amount of energy stays the same!!

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• What is vaporization?

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• The change from a liquid to a gas

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• What is the change from gas to a liquid?

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• condensation

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• When is a new substance form?

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• In a chemical change

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• What happens to the energy during a chemical
  reaction?

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• It is absorbed or released

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• What happens to truck tires when overused?

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• Get hot and pressure increases

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• When the temperature of a gas increases

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• The pressure increases

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• In Boyles Law, when the pressure of a gas
  increases

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• Volume decreases

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• Volume

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• The amount of space that a gas takes up

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• What is a solid?

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• Where particles are tightly packed together in
  fixed positions

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• What state of matter changes its volume the
  easiest?

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• gas

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• What type of matter is arranged in crystalline or
  amorphous patterns?

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• solid

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• What is viscosity?

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• The resistance of a liquid to flowing

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• In a rigid container when the temperature of a
  gas decreases

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• The pressure will decrease

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• What happens as a substance cools?

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• It loses thermal energy to its surroundings

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• What is a sublimation?

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• The change from a solid to a gas without passing
  through the liquid state

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