Water and Electricity

ACTIVITY TAKEAWAYS

- Different substances have different characteristics because they are made of different particles. Or, each substance has particles that are unique to that substance. Example: Water is always H20.
A chemical reaction is when substances change into other substances.
Molecules are a combination of smaller particles (atoms) that have different characteristics than that atoms that make them.
Atoms are particles that only combine in chemical reactions.
Energy was required to separate water molecules into hydrogen atoms and oxygen atoms.
- - The same is true for melting and evaporation. Energy is required to separate water molecules from each other.

What Should You Do If You Missed Class

Watch the STUDENT EXPERIMENT video if you missed class and don't remember seeing it.
Watch the TEACHER DEMO video of you missed class and don't remember see it
Look at the picture of the notebook and study the observations that were made by students in the class - Basically MAKE SURE you get to see what everyone else got to see.
Read the guiding questions at the bottom of the page and THINK about them for a few minutes
Go to Google Classroom and do the reflection for 1-3 Water and Electricity (this won't happen until at least 9/15/23 but probably more like the week of 9/18)

DO NOT

Look up information about this. This class is about the process of science, developing thinking skills, and constructing explanations. It is not about answers. If you look up information you will still need to explain the process using only the evidence from class.

Part 1 - Student Experiment

IMG_0485.MOV

This shows the experiment that students did in class. Some of the later classes used graphite rods instead of pencils sharpened at both ends.

Part 1 - Student Observations

This is an example of observations that one of the classes made after observing the pencils connected to the power supply.

Part 2 - Teacher Demo

This device does basically the same thing as the pencils connected to the power supply. The main different is that instead of the gas in the bubbles escaping into the air, this device can capture the gas so it can be tested to determine characteristics.

Part 2 - Student Observations of Teacher Demo

These are observations that students made of the device that can capture the gas.

Videos of Water Behavior From 7th Grade

Water Drops Touch.mov

WaterBending.MOV

Water bending. Notice that one of the rods attracts the plastic strips and one repels the plastic strips but both attract the water (sorry that part is a little hard to see) . The two videos below show the water bending part better.

Guiding Questions

First, think about these questions. These should help you start to think about what might be going on in the tubes.

What do you know about + and - charges? What attracts, what repels?
What do you know about water from 7th grade (see vidoes for a refresher)
What substances are already there ( in the pencil and water experiment or in the device that can capture the gas) that could be in the bubbles?
Are the gas/substances in the bubbles the same substances or different substances? How do you know?

Journal Entry 1-3 in Google Classroom

This will not happen in class until 9/18/23 for some classes and 9/19/23 for others.