August 17, 2018 Please get out the following: 1. Warm Up Sheet 2. Pencil 3. Signed Syllabus if you need to turn it in Warm Up Four students are having a discussion about what to do for the upcoming science fair. This were the questions they proposed: Julian: Is it more exciting to drive a motorcycle blindfolded or go skydiving? Melissa: Is Einstein is the greatest scientist ever? Jason: How do different types of activity affect human heart rate? Antonella: Why is the sky blue? Which student is posing a testable question? Explain your choice and why you think the other three questions are not testable. Testable explanation of an observation. NOT just an educated guess It must be based on research AND be able to be tested. A hypothesis should: -Define the proposed relationship between the variables. -Worded so it can be tested -Make a clear prediction -Be specific Example • A student is interested in designing several experiments to test the factors that effect how quickly an Alka-Seltzer tablet dissolves in water (solution rate). Question: What effect does stirring have on solution rate? Hypothesis: If the water is stirred, then the tablet will dissolve faster because stirring increases solution rate. Practice A student is interested in designing several experiments to test the factors that effect how quickly an Alka-Seltzer tablet dissolves in water (solution rate). Question 1: What effect does the water temperature have on solution rate? Questions 2: What effect does crushing the tablet have on solution rate? Question 3: What effect does adding soda to the water have on solution rate? Practice For your question, write an appropriate hypothesis that could be tested with and experiment. Question 1: What effect does the amount of light have on plant growth? Question 2: What effect does the amount of water have on plant growth? Question 3: What effect does using plant food have on plant growth?