Chemistry 1

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Chemistry 1

• Welcome to the first real day!

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Chem-is-try

• You already know a lot!
• What is matter?
• Anything that takes up space and has mass
• What is mass?
• Measure of the amount of matter in an object

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Chemistry

• Studying the composition and properties of matter
• Many different types of chemistry

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Scientific Method

• You already know this!
• Look at the soda can..
• Observation vs. Conclusion
• Observation - statement that accurately describes
  reaction from a sense
• Conclusion - statement based on what we think
  about a series of observations

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Lets get physical

• Physical properties can be observed without
  changing the chemical makeup of a substance
• Smell, color, taste, electroconductivity
• Physical changes - changes not accompanied by a
  change in chemical makeup
• Melting

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Chemical props

• Chemical reaction - chemicals interact with each
  other to from new substances with new properties
• Chemical properties describes a chemical change
  that a substance undergoes

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Extensive and Intensive

• Extensive properties
• A property hat depends on the sample size
• Volume, mass
• Intensive properties
• Independent of sample size
• Color, electrical conductivity, melting point,
  boiling point

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Why are these important?

• Chemical analysis

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Organization

• Three states of matter!
• Solid, liquid, gas
• Elements!
• Decomposition - chemical rxn where one substance
  turns into two or more!
• Elements - Substances that cannot be decomposed
  into simpler materials!

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Lets talk The Periodic Table

• Atoms - very small particles!
• Atoms to molecules to elements to compounds!

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Compounds

• Compounds - substance formed from two or more
  different elements
• They are always formed in constant proportions!
• Properties are always different from individual
  element

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Atoms!

• Atoms are made of subatomic (smaller) particles!
• Three types
• Protons ( charge)
• Neutrons (- charge)
• Electrons (- charge)
• Nucleus at center
• Protons and neutrons found here

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The atom
http//www.phrenopolis.com/perspective/atom/index.
html
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Like repels like!

• Electrical charges repel and attract
• Electrons spread out
• Nuclear forces keep protons together
• Neutral