Yesterday we asked are all chemicals bad
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Yesterday, we asked “are all chemicals bad?” PowerPoint PPT Presentation


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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?”

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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


Next the scientific method

Next, the Scientific Method


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


Parts of an experiment

Parts of an experiment


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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