Scientific Method Notes Qualitative vs Quantitative Observation Chem

Scientific Method Notes Qualitative vs. Quantitative Observation Chem. ROCKS YOUR SOCKS OFF!!! Paraphrase your Notes Please!

Chemistry is called the “Central Science” § Chemistry: the study of matter & the changes it undergoes § Why is this important in the world? § Space Exploration § Alternative Energies § Nutrition Facts § Cancer Treatment/Research § Medical Research § Making Drugs (both good and bad kinds)

Chemistry in Life

What is the Scientific Method? § The Scientific Method: an organized process used in scientific study (Bio, Chem. , Physics…) to do research. § In this course we will focus on the main parts of this method.

1. Observation- gathering information § 2 types of observations: A. Qualitative— words § Information that you observe with one of your 5 senses (color, odor, shape, or other physical characteristics) B. Quantitative— numbers § Information that is measured, such as temperature, volume, size, mass, etc.

Qualitative or Quantitative?

Practice: Qualitative or Quantitative? 1. 2. 3. 4. 5. 6. My Eyes are brown My neck is 17 inches The reaction produced bubbles The temperature is 25 degrees Celcius One year has 365. 25 days in it The reaction turned blue

2. Hypothesis—a tentative explanation for what has been observed. § What are some examples of a hypothesis? Examples: § If I open the faucet wider, then more water will come out. § If students eat breakfast, then they will be more alert in school. Write your own example! § If ________, then _______.

3. Experiment—set of controlled observations that test the hypothesis § Independent variable: the variable that you change § Dependent variable: the variable that is affected § Example: Testing how salt dissolves in hot water vs. cold water § Independent variable: What is changed? § Dependent variable: What is being changed?

#3 Cont… § Control Variable: a standard to compare your results to, “normal” § Ex: room temperature water

4. Conclusion—a summary or judgment based on the information obtained from the experiment § Here data is analyzed and checked against the hypothesis to form a conclusion § If Data supports a hypothesis, it does not necessarily prove it; it can still be disproved § The majority of hypotheses in science are not correct

5. Theory—Explanation based on many observations and investigations over time (Theory of Evolution) Vs. 6. Scientific Law—A relationship in nature that is supported by many experiments (Newton’s 3 rd Law).

One Minute Essay (OME) Write a short summary: § Why is the scientific method important? § The scientific method is important because…

Qualitative vs. Quantitative Your group will receive an item Describe it in qualitative and quantitative terms § You will have 3 minutes to describe it on your own § Then your group will come up with a group description § Share as a class and guess! Create a chart on the LEFT side: Qualitative Quantitative Color? Smell? Taste? How tall is it? How wide?

AMP it up! Write on the left side of your notebook: § What did you learn today about quantitative vs. qualitative observations? How are they different? (3 -5 sentences)