Unit e chapter 2 Matter: Properties

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Unit e chapter 2Matter Properties changes
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Lesson 1 Observable Physical Properties

• Color
• Smell
• Shape
• Texture
• Malleability
• Ductility
• Attraction to magnets
• State of matter
• Buoyancy

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Measurable Physical Properties

• Mass
• Volume
• Density
• Melting boiling points

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Lesson 2 CHEMICAL REACTIONS

• Chemical change
• -same atoms are present
• -new substances have been formed
• -atoms have been rearranged
• Endothermic chemical reaction that absorbs
  energy
• Exothermic chemical reaction that releases
  energy
• Evidence of chemical change production of light,
  sound, smoke, or a new color or smell

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• Combustion reaction (fireworks) exothermic
  reaction in which a substance combines with
  oxygen produces heat often light
• Decomposition reaction a substance is broken
  down into simpler substances
• Double replacement reaction ionic compounds
  exchange ions with each other
• example reactions between acids bases

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Processes that prevent chemical reactions to food

• Refrigeration
• Freezing
• Adding preservatives
• Adding antioxidants
• Why is the Declaration of Independence stored in
  a helium-filled case?
• Helium does not react with other substances. It
  is a noble gas.

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MIXTURES

• Pure substance material made up of only 1
  element or compound
• Mixture parts do not always have to be in same
  proportions (unlike compounds)
• Because substances in a mixture do not go through
  chemical changes, they can be separated from each
  other by physical methods
• Distillation the process of separating a mixture
  made up of a solid a liquid (or a liquid a
  liquid) by heating it

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SOLUTIONS

• Solute a solid dissolved in a liquid
• Solvent the liquid in which a solute is
  dissolved
• Alloy a solid solution made up of a metal
  combined with another substance