yesterday we asked are all chemicals bad
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Yesterday, we asked “are all chemicals bad?”. No, but some can be dangerous Chemicals are everywhere Which brings us to…. What is Chemistry ?. the study of matter and the changes that it undergoes. What is Matter ?. anything that has mass and takes up space . What is Mass ?.

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yesterday we asked are all chemicals bad
Yesterday, we asked “are all chemicals bad?”
  • No, but some can be dangerous
  • Chemicals are everywhere
  • Which brings us to…
what is chemistry
What is Chemistry?
  • the study of matter and the changes that it undergoes.

What is Matter?

  • anything that has mass and takes up space

What is Mass?

  • a measurement of the amount of matter in an object
mass verses weight
Mass verses Weight
  • They are related, but what’s the difference?
  • Mass is universal, weight depends on gravity
  • Weight = mass times the gravitational pull
branches of chemistry
Branches of Chemistry
  • Organic
  • Inorganic
  • Analytical
  • Physical
  • Biochemical
organic
Organic
  • Area of Emphasis
    • Most carbon-containing chemicals
  • Examples:
    • Pharmaceuticals
    • Plastics
inorganic
Inorganic
  • Area of Emphasis
    • In general, matter that does not contain carbon
  • Examples:
    • Minerals
    • Metals and nonmetals
    • Semi-conductors
analytical
Analytical
  • Area of Emphasis
    • Components and composition of substances
  • Examples:
    • Food Nutrients
    • Quality Control
physical
Physical
  • Area of Emphasis
    • The behavior and changes of matter and the related energy changes
  • Examples:
    • Reaction Rates
    • Reaction Mechanisms
biochemical
Biochemical
  • Area of Emphasis
    • Matter and processes of living organisms
  • Examples:
    • Metabolism
    • Fermentation
why do we have the scientific method

Why do we have the scientific method?

Gives us logical steps to follow to assist us in answering a question.

what are the steps
What are the “steps”?
  • Develop a question
  • Conduct background research
  • Form a hypothesis
  • Test with an experiment
  • Make observations and collect data
  • Analyze the results
  • Draw conclusions
  • Report results and test again
independent variable
Independent Variable
  • Part of the experiment that the scientist changes
  • What is being tested
  • There is only one independent variable at a time.
  • What I change
dependent variable

Dependent Variable

Part of the experiment that changes because of the independent variable

control

Control

Part of the experiment that does not receive the independent variable

constants

Constants

Part of the experiment that remain the same for every part of the experiment

types of data
Types of Data
  • Quantitative
    • Data that is numerical in nature
  • Qualitative
    • Data that is descriptive in nature
an example experiment
An example experiment
  • A person wants to test whether music can help make plants grow. The person plants several seeds from the same batch into identical flower pots with identical potting soil, watering schedule and light supply. One flower pot is isolated from the sound supply, while the other pots are subjected to various types of music. After 1 month, the “healthiness” of each plant is measured.
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