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

Procedure1) Gather materials: Pipette, penny, beakers of hot

and cold water samples2) 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.