Topic 7.1 Experimentation

Experimental Design RQ = Research Question What is the effect of _________ IV on the __________? DV

RQ: What is the effect of temperature on the hydrogen bonding between water molecules?

Variables Independent Variable = Temperature (the variable I changed) Dependent variable = Depends on what you changed (observed or measured after changing the IV)

What do we know about water thus far? Increase temperature increases Particle Motion How would this effect the Hydrogen bonding between water molecules?

Hypothesis with explanation If _____________________ then, ____________ because ________________

Constants and control: Penny (heads up or down?) Pipet (Type and held vertically or at an angle) Drop height? Surface? Person dropping? Water source

Procedure: Numbered and clearly written steps that follow the experiment design

Procedure 1)Gather materials: Pipette, penny, beakers of hot and cold water samples 2)Place a penny face down on a hard flat surface. 3)Place drops of water on the penny holding the pipet at a 45 degree angle 1cm above the penny while counting until the water spills off the penny. 4)Dry off the penny and repeat steps 2-3 record the data in a data table. 5)Repeat 2-4 with the hot water sample. 6)Calculate the average for cold and hot water and record with the class data.