Living Environment Scientific Method
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What is the importance of collecting evidence in science?
Evidence is used to prove theories and scientific laws. Without it, these facts are just unsupported opinions.
What is the difference between an observation and an inference?
An observation is a fact. It can be sensed or measured. Inferences are conclusions based on the observations, and you are assuming to be true based on what you have seen.
What is an assumption?
Something that you assume will be true. Avoid assuming results in experiments, because it will cause you to skew the data a little bit whether you realize it or not.
What are the three parts in developing a research plan?
- 1. Getting background information
- 2. Developing a hypothesis
- 3. Perform an experiment
Why is it important to have background information?
It provides the scientist with an understanding of the topic.
What makes a good hypothesis?
It is not a question, and it can be tested
How is a hypothesis that is not supported still important to the investigation?
New information is still gained in the process
List things about the independent variable
- It is found on the X-axis
- The person experimenting is in control
- It is not the data collected
- Not affected by anything in the experiment.
List things about the dependent variable
- Found on the Y-axis
- Factor that is manipulated in the experiment by the independent variable
- What is measured
- The data that is collected
What is the purpose of a control group?
To compare the results to the experimental group and see how things changed from its normal environment to the experimented environment.
How are experiments controlled?
- Make sure things are the same size
- Given the same amount of something
- Grow in the same conditions
- Have an equal number of subjects in both groups
Why do you only want one variable between experimental groups?
If you have more than one, then you can't determine what variable did what
Make sure that you label all of the things on a graph and a data table!!!
What is the purpose of a conclusion?
To determine what the results represent and how the hypothesis was supported or disregarded.
How can you validate experiments?
- Add more test subjects
- Give specific directions for another person to repeat the experiment through peer review
- Repeat the experiment multiple times.
What tool is used to identify the volume of a liquid?
What is used to measure mass?
A triple beam balance or an electric balance.
What microscope do we use?
A compound microscope
What is the formula for determining total magnification?
Eyepiece x Objective = Total Magnification
The object in a microscope will be...
Upside down and backwards
The field of view becomes...
darker as magnification increase. Just adjust the diaphragm to fix it.
The field of view becomes darker and...
smaller as power increases. Center the object in low power first.
Why do you use a wet mount slide?
To keep the object moist and avoid quick drying and shriveling
Why do you stain a specimen?
To see a clearer and thinner specimen easily
What is chromatography?
A technique of separating mixtures of molecules
What is a bias?
Leaning toward or favoring one side of an experiment compared to the other.
What is scientific literacy?
Applying critical thinking skills to every day life.
Name the starting color and positive color of glucose indicator
- Start: Blue
- Positive: Orange
List the starting color and positive color of starch indicator (iodine).
- Start: Amber
- Positive: Blue-black
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