How Do Lava Lamps Work What is a
- Slides: 12
How Do Lava Lamps Work?
What is a Lava Lamp Really? • Lava lamps, for our purposes, are containers with a mixture of immiscible liquids • One liquid rises in blobs giving the appearance of lava
What? • “Immiscible” - two things that don’t mix together (e. g. , oil and water) • Surprising that the substances don’t mix because they are both liquids
What Does This Have to Do with Lava Lamps? • The lava lamp I will demonstrate is made of oil, water, and Alka. Seltzer • To understand why lava lamps are made of these ingredients let’s take a closer look at each one
Oil • Oil molecules form an “induced dipole interactions” • The interactions between the molecules aren’t that strong • Oil is hydrophobic
Water • Water molecules interact through dipoles • Water is hydrophilic • This makes water a tetrahedral
Alka-Seltzer • Alka-Seltzer releases CO 2 • The CO 2 makes the water float
This is like… • Vinegar and baking soda experiment • H-Ac + Na. HCO 3 --> Na+ & Ac- & H 2 O & CO 2 (gas) • Both reactions release CO 2
Heat versus Alka-Seltzer • Alka-Seltzer replaces heat used in traditional lava lamps • Heat makes the molecules move faster • The faster they move, the size is increased, but the mass stays the same • Density is lowered, causing molecules to float
Put It Together • The water sinks and the oil floats • When the CO 2 attaches to the H 2 O it makes the water float • When the water reaches the top, the CO 2 goes into the air and the water sinks back down
Which One Would You Choose? Water Molecule Oil Molecule
In Chemistry Terms • Water can bond with oil but doesn’t want to • This is because the dipole interaction of the water is stronger than the dipole induced dipole of the oil and water • This keeps the water moving because none of the water wants to be stuck next to the oil
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