1-2 introduction to chemistry

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Warm Up• Describe each of the following items.

• Do not name the items or describe is function.

1-2: Introduction to Chemistry• Define chemistry and matter.

• Compare and contrast mass and weight.

• Identify the common steps of scientific methods.

• Compare and contrast types of variables.

Chemistry & Matter• Matter is everything in the universe.

• It fills space and makes up the things that we use everyday.

• A candle is made of matter.

• The wax (matter) and oxygen (matter) burn to produce carbon dioxide (matter) and water (matter).

• Matter is anything that takes up space.

• Mass is the measurement of how much matter is present.

Mass vs. Weight• Mass and weight are not the same thing.

• Many use them interchangeably, but science does not.

• Weight is the measure of gravitational forces acting on mass.

Scientific Method1. Observation

• Collect data that leads to a question.

2. Hypothesis• Prediction about the outcome of an experiment that

supplies a probable answers to the question.

3. Experiments• A set of controlled activities or procedures.

4. Data analysis• An evaluation of collected information.

5. Conclusion• Did the hypothesis answer the question.

6. Retest or revaluate

Observations

Use as many senses as is sensible! Avoid vague terms. A ‘bad’ estimation

is better than a general term. Do not identify … describe. Do not “liken”… describe.

Note the excessive use of DESCRIBE

Observations

1. The dessert is delicious.

2. The dessert is colorful.

3. The dessert is like a torte.

4. The dessert is tiny.

5. The dessert is chocolate moose cake.

1. The dessert is thick and creamy.

2. The dessert is several shades of light brown.

3. The dessert is round and flat.

4. The dessert is an 8 inch diameter.

5. The dessert is made of chocolate cream and fudge.

Unit 1-1 Summary• What is chemistry?

– The study of matter and any changes in matter.

• What is matter?– Anything that has mass and takes up space.

• What is weight?– It is the measure of the effect gravity has on

mass.

• What are the five steps to the scientific method?– Observation, hypothesis, experiment, data

analysis, and conclusion.

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