Next, answer the following questions in your notebook:

1. Explain what happened to the water droplet for each thing you did (Did the water drop break apart or stay together? Did it separate easily or was it difficult?) Record what happened when you:

a. Squeezed out the drop of water:

b. Tilted the wax paper: c. Pulling the drop around the wax paper:

d. Tried to split the drop:

2. The other day we looked at food coloring in hot and cold water to show that particles are in constant motion. Watch this animation of what was going on with the particles for a reminder: https://youtu.be/CXY02tcgiBY (Fast forward through it to see start & end) THEN…watch this video to see why!

a. Draw your own molecular model in your notebook for . Make sure to show that water molecules are randomly arranged, close together because they attract each other, and moving!

3. Explain what it is about water molecules that make the water drops difficult to split apart, but easy to join together.

4. Watch this video of a water balloon being popped in slow motion, http://science360.gov/obj/video/ef933250-6e76-4b2e-b653-99ce6394ca63/physics- popping-water-balloon

a. Why do you think the water keeps its shape the moment the balloon is popped?

b. Imagine a drop of water hanging from your finger. How is this similar to the water staying together after the balloon is popped?

See if you can use The Particle Theory of Matter to win these water games! Water Drops Unite:

Procedure 1. Tape a piece of wax paper over the “Water Drops Unite!” sheet. 2. Place about 5 drops of water in each of the small circles around the outside. 3. As fast as you can, use your straw to drag each drop of water to the center. When all the drops are united in the center, you are done. 4. Challenge your partner to see who can unite all their water drops the fastest.

Race Drop Raceway Procedure 1. Tape the Race Drop Raceway sheet onto a piece of cardboard to give it support. 2. Tape a piece of wax paper over the “Race Drop Raceway!” sheet. 3. Place 2–4 drops of water together to make one larger drop at the “Start”. 4. As fast as you can, tilt the cardboard and guide your race drop around the track to the “Finish”. 5. Try not to touch the edge of the track. The first to finish is the winner.