A Case For Particles

Particle Theory of Matter

All matter is made up of smaller particles. Part 1: THINK OBSERVATION: In the freezer, ice cubes

become smaller over time. 1. Where does the ice go? Inference: 2. How does it disappear? Inference: Do the inferences you wrote support the

idea that water is made of particles?

Part 2: EXPERIMENT

Predict: What will happen when you add these particles?

100 ml of sand + 100 ml of water = ____ml

Do: Pour 100 ml of sand into a beaker (measure as close to 100 as possible). Then measure 100ml of water into a graduated cylinder. Carefully pour the water into the sand. Record the volume of the mixture:

100ml sand + 100 m water = _____ ml *It is not all that accurate to read the volumes

from the numbers on the beaker, but read them as close as you can.

Make a drawing to show what happened to the particles of the sand and water.

100 ml of sand

100 ml of water

__ ml of sand + water

= sand particle= water particle

Predict: What happens when you add these particles?

10 ml salt + 50 ml water = ______ ml

Do: Measure 10 ml of salt into a graduated cylinder,and pour the salt into a clean, dry beaker. Measure50 ml of water into a graduated cylinder, then carefully pour the water into the beaker with the salt. Gently swirl (without spilling!) the salt water until most of the salt dissolves. Pour the salt waterinto the graduated cylinder to measure it’s volume:

10 ml salt + 50 ml water = _______ ml

What happened to the salt when it was mixed with the water?

Can you still see salt crystals?

If the final volume of salt water was less than 60ml, where did the salt particles go?

Predict: What happens when you add these particles? 40 ml alcohol + 50 ml of water= ____ ml

Do: Measure out 50 ml of water into a graduatedcylinder. Save the 50ml of water in an empty beaker. Measure out 40ml of alcohol into a graduated cylinder(pour directly from the bottle), and then carefully pour the 50 ml of saved water into the alcohol so that there is a mixture of alcohol and water inside the graduated cylinder. Swirl gently (it is important not to spill!)Record the volume of the mixture:

40 ml alcohol + 50 ml of water = _____ ml

Conclusions

How does the particle theory of matter explain the observations you made in these experiments?

If all matter is made up of smaller _______, there must be _______ in between the particles. When the items are mixed together, the volume of the mixture is _______ than predicted. Therefore, the _________ of one kind of matter must be filling the _______ between the particles of the other kind of matter. Solids, liquids, and gasses must all be made up of __________ _________, even if we can’t see them. This is an _____________ we can make based on observations.