HYPOTHESIS: (your educated guess) RATIONALE: (reasons for hypothesis) Daily Challenge, 9/23 Practice using the scientific method by writing a hypothesis and rationale for this question… QUESTION: How does the mass of a deflated balloon compare to the mass of an inflated balloon? Independent, manipulated variable = inflated/deflated Dependent, responding variable = mass HYPOTHESIS: (your educated guess) RATIONALE: (reasons for hypothesis)

MATERIALS: PROCEDURE: OBSERVATIONS: (list materials needed) (steps taken to test hypothesis) OBSERVATIONS: (data collected) Balloon Condition Mass, g deflated inflated

ANALYSIS: CONCLUSIONS: EXTENSIONS: (Tell how experiment was controlled. Graph and explain the data.) CONCLUSIONS: (Explain whether or not your results support your hypothesis) EXTENSIONS: (Discuss any errors in the experiment and remaining questions to be investigated)

Daily Challenge, 9/24 Describe 3 objects or materials that are very dense. Describe 3 objects that are NOT very dense.

mass Density = ----------- volume Mass is measured in grams with a beam balance or digital scale. Volume is measured in mL (or cm3) with water displacement or by measuring dimensions and using a formula like length x width x height for a block shape.

Beam Balance for mass measurement

Graduated Cylinders for volume measuring

TODAY Practice using the beam balance and digital scales to measure the mass of a die. (You should get the same measurement on different scales!) Practice using a micrometer to measure the length, width and height of a die. Calculate the die’s volume from these measurements. Practice using the water displacement method to find the volume of a die. Are the volumes the same? Calculate the density of the die and compare your findings to others. Work on the graphing exercise from yesterday. It’s due tomorrow.

Daily Challenge, 9/25 Copy & finish this lab experiment plan… Problem: What happens to the mass, volume, and density of gum after you chew it? Hypothesis: I think that when I chew the gum, the mass will ____, the volume will ____, & the density will ___. Rationale: Write WHY you believe this… Materials: List materials needed to test hypothesis… Procedure: List steps to test hypothesis… Data & Observations: data table…

Daily Challenge, 9/28 Consider your results from Friday’s lab to see what happens to the mass, volume, and density of gum when you chew it… Finish the lab write-up you began Friday Analysis: GRAPH your data… Conclusions: Tell whether or not your hypothesis was supported… Extensions: What errors were made? What improvements should be considered? Any remaining questions?

TODAY Work with your group to compile everyone’s data on the same data table and graph all of your data on the same graph(s). These graphs will be presented to the class. Did anyone see the rainbow yesterday ~6:15pm?

Scientific writing (lab report) has 9 parts Remember: Scientific writing (lab report) has 9 parts PROBLEM (question relating independent & dependent variables) HYPOTHESIS (educated guess) RATIONALE (research why the hypothesis is reasonable) MATERIALS (what is needed to do experiment) PROCEDURE (steps to do experiment) DATA & OBSERVATIONS (facts only) ANALYSIS OF RESULTS (what facts mean, interpretations, graphs, etc.) CONCLUSIONS (Is hypothesis supported?) EXTENTIONS (errors, solutions, remaining questions)