Tuesday 8/25/2015 Finish scavenger Hunt-10 min Start scientific method Reminder: All supplies due Wednesday (tomorrow) Safety contract must be signed by Friday 8/28

Wednesday 8/26/2015 Supplies check! Please have your supplies out Finish scientific method Data analysis Reminder Safety contract due Friday! Root word quiz Friday (words 1-5)

Lesson Frame We will organize the steps of the scientific method and identify variables in an experiment. I will identify variables and analyze the scientific method and data in an experiment using c-e-r. What is a scientific method? A: a scientific method is the steps a scientist use to formulate a hypothesis, experiment, and conclusion. Why is it necessary to have a scientific method and kept the same across all fields of science? A: so the scientists can compare results done under similar conditions and methods.

Lab: iodine and starch experiment Make a hypothesis on what would happen if the iodine is added to the Starch water vitamin c solution Will there be a color change or not? Make a prediction on whether the iodine solution will change color when mixed with vitamin c or with starch solution.

Lab set up Types of solutions: water water + Vitamin c Liquid Starch

If I am comparing the color change between the three solutions, what factors should I keep the same? Number of drops_____ Amount of solution 100mL Number of vitamin c tab -2 The amount of volume for each solution The type of container (beaker) The number of drops of iodine into each solution

Iodine (Indicator) Iodine will change color (blue or dark purple) in the presence of starch What are some situations where you think having an indicator is important?

With your partner come up with the types of variable we need in a lab experiment? Types of solutions: water water + Vitamin c Liquid Starch

Let’s define our terms (foldable) Independent variable Dependent variable Control group Constant

Independent variable M-manipulated I-independent X- x-axis What I change in an experiment. “ I the scientist manipulate/change it” Ex: type of something, time M-manipulated I-independent X- x-axis

Dependent variable (Depends on the other variable) the result of the experiment. “What I observe” Ex: amount produced, color changes D-dependent R-result Y-y-axis

Lab set up What were the Constants (stays the same)? ____________________________________ Which was the Control group (we know will not change)? _______________________________

Does the boiling time of the liquid affect the size of the eyeball?

Control group Does not change from natural conditions. Ex: plants grown in sunlight

constants The factors that must remain the same. “What I keep the same” EX: plant experiment- same type of soil, same amount of soil, same type of plant, same amount of water, etc…

variables What was the independent variable? (the one that we change) _______________________________ What was the dependent variable? (factor that was effected/result) ------------------------------------------------

Qualitative vs. quantitative observation/data (write this on page 4) Qualitative data: is a description Ex: smell, texture, color, etc… Quantitative data: can be measured, involves numbers Ex: height, time, speed, weight, cost, etc…

Activity: identify experiment variable worksheet With your partner, you will read the description for each lab experiment and identify the variables for each question.

Questions

Hypothesis Definition: A tentative statement about the relationship between two or more variables. It has to be measureable! Example: If sugar is placed in hot water it will dissolve faster than if it were placed in cold water. Usually written in an “If……..Then…..” statement (an educated guess about how things work)

Theory A theory is built upon one or more hypotheses, and upon evidence. Example: Theory of Evolution (species change over time due to environment)

Claim Claim is the statement that answer your original question. The claim must be accurate, specific, and answer the question. The claim is usually one sentence in length. It is also your Hypothesis.

Evidence The evidence is all the scientific data that supports your claim. Specific fact (in reading) Data: Graph, tables, charts

Reasoning Explains why your evidence proves your claim to be true. (Conclusion) In science, this usually includes the science principle or phenomena involved.