What is Chemistry

1
What is Chemistry ?

• Study of the composition, structure, and
  properties of matter
• Study of the changes that matter undergoes

2

(PowerPoint)Branches of Chemistry pg. 6(see
workbook homework)

• Organic chemistry
• Inorganic chemistry
• Physical chemistry
• Analytical chemistry
• Biochemistry
• Theoretical chemistry

3
Whats the difference between?

• BASIC RESEARCH
• APPLIED RESEARCH
• TECHNOLOGICAL DEVELOPMENT

4

• BASIC RESEARCH
• increase knowledge
• APPLIED RESEARCH
• solve a problem
• TECHNOLOGICAL DEVELOPMENT
• produce products to
• improve the quality of life

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1-2 Matter and Its Properties
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Changes may be

• Physical
• Chemical

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Changes may be

• Physical remains the same substance
• (i.e.. melting, grinding)
• Chemical transforms into a new substance (i.e..
  iron rusting, milk souring)

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Signs of a physical change

• Change in size, shape or state

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Signs of a chemical change (add)

• ? (change in) color
• ? energy
• Gas given off
• Precipitate forms

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Properties may be

• Physical
• Chemical

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Properties may be

• Physicalcharacteristic that can be
  measured/observed without changing the identity
  of the substance (i.e.. color, mass)
• Chemical description of the reaction of a
  substance with another material (i.e.. silver
  tarnishing in the air, sparkler burning in the
  air)

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A Physical property may be

• Extensive depends on the amt of matter that is
  present (i.e.. mass, length)
• Intensive does NOT depend on the amt of matter
  present (i.e.. color, melting pt)

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PC Which of the events below are chemical
changes? (in PowerPoint)

• Fading of color in drapes hanging by a window
• Growing of a plant
• Melting ice
• Digesting food
• Formation of a cloud
• Healing of a wound
• Making rock candy

14
PC Which of the events below are chemical
changes?

• Fading of color in drapes hanging by a window
• Growing of a plant
• Melting ice
• Digesting food
• Formation of a cloud
• Healing of a wound
• Making rock candy

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Which properties are intensive?

• Mass
• Color
• Ductility
• Length
• Melting point

16
Which properties are intensive?

• Mass
• Color
• Ductility
• Length
• Melting point

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Which properties are physical?

• Color
• Flammability
• Solubility
• Melting point
• Stability (shelf life)

18
Which properties are physical?

• Color
• Flammability
• Solubility
• Melting point
• Stability (shelf life)

19
What is the difference between a homogeneous and
a heterogeneous substance?

• Homogeneous substance that is uniform (same) in
  its composition
• Heterogeneous substance whose composition is not
  uniform throughoutalways a mixture

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Classification of Matter
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Elements

• Section 1-3

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What is .

• Element pure substance made of only one atom
• Compound Substance made from atoms of 2 or more
  elements that are chemically bonded
• Atom Smallest unit of an element that maintains
  the properties of that element
• Matter anything that has mass and takes up space
• Mass measure of the amount of matter
• Weight measure of gravitational pull on matter

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Periodic Table

• Groups or Families
• vertical columns
• Periods or Rows
• horizontal rows
• 2 main sections
• Metals
• Non-metals

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• Metal
• Good conductor of heat electricity
• Nonmetal
• Poor conductor of heat electricity
• Metalloids
• Some characteristics of metals nonmetals
• Noble Gases
• Group 18
• unreactive

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Grades of Chemical Purity

• Sucrose
• ACS (Reagent) 500 g _at_ 7.54
• CP (Laboratory) 500 g _at_ 5.75
• FCC (food) 2,500 g _at_ 16.60