Objective

As part of our science lessons this school year, we are trying out all kinds of really neat science experiments and activities. This lava lamp experiment tops the list!

Both of my kids had a blast with this. We’ve actually done it several times and with all different colors, but it never ceases to amaze them. It’s almost shocking how long they will engage with it.

One great thing about this science experiment is that you only need a few supplies and your probably already have most of them in your home or classroom.

Materials Needed:

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• Vegetable Oil
• Water
• Food coloring – primary colors or neon
• Original Alka Seltzer tablets

To begin, color about 1/2 cup of water with food coloring. I like using these gel food colors for vibrant coloring.

Take the Alka Seltzer tablets and break them into 2 or 3 pieces. Place them in a small cup or container.

Procedure:

Fill a glass about 3/4 full with vegetable oil. Then pour in the colored water until the liquid in the cup is about 1-2 inches from the top.

You don’t want it to overflow! Well, unless you want to turn it into an eruption experiment too. For this reason and quick cleanup, I like to do this on a tray.

Let the children take turns adding a piece of an Alka Seltzer table to the cup. *DO NOT let them put the tablet in their mouth at any time.

Results:

Due to having a polarity in water molecule, we will see such amazing effect.

Explanation:

The water and oil do not mix and the oil doesn’t change color because the food coloring is water soluble. The Alka Seltzer reacts with the water to make bubbles of carbon dioxide. The bubbles attach themselves to the blobs of colored water and bring them to the top of the glass. When the bubbles pop the blobs of colored water fall back to the bottom of the glass.

This lava science experiment is sure to WOW your kids. They may even ask you to do it over and over again like mine did!

Further investigation:

Feel free to repeat this experiment with other liquids! Just make sure that you keep all of the other conditions of the experiment the same.

Disclaimer and Safety Precautions

Problem

Which metal is the best conductor of heat: copper, steel, or brass? Why? After doing some online research, formulate your hypothesis.

Materials

• 3 12-inch long metal rods or thick wire: copper, steel, brass, or other metal. Make sure all the wires are the same gauge, or thickness. Why do you making sure the gauge is the same might be an important step?
• 8 identical Styrofoam cups
• Something to boil water in (a pot or kettle)
• Stove
• 4 instant digital thermometers
• Pitcher or other large container that will fit in the refrigerator
• Water
• Notebook and pen

Step-by-step instructions:

1. Fill a pitcher or other large container with water and ice cubes. Allow the water in the pitcher to cool for at least half an hour.
2. Bend each metal rod in half two times to make metal bridges. Why do you think we should fold the rod in half twice? Would folding it once produce the same results?

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3. Place the cups in pairs. Three bridges of the same metal go between each cup. One pair of cups will have no bridges. This is the control group.

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5. Place the instant digital thermometers in each of the cups that will hold cold water.
6. Have an adult boil some water. Let it cool a bit before use.
7. For each pair of cups, pour equal volumes for hot water into the “hot” cup. Be sure the water covers the ends of the bridges.
8. For each pair of cups, pour equal volumes of cold water into the “cold” cup. Be sure the water covers the end of the bridges. Why do you think the volumes of water need to be equal?
9. Take the initial temperature of the cold water. Record the temperature in a chart listing the time (in minutes) and temperature (in degrees Fahrenheit).
10. Record the temperature of each cold water cup every 5 minutes for a total of 30 minutes. Your table should have which set it is (none, copper, steel, brass), time, and boxes to fill in for temperature. Do you think that all of the heat that’s conducted away from the hot cup goes into the cold cup? Why or why not? Hint: sometimes heat doesn’t always go where we want it to!
11. Which cup of cold water experienced the greatest change in temperature from the beginning to the end? Calculate this by subtracting the cup’s starting temperature from its final temperature.
12. Organize your data with line graphs. On the x-axis, plot time in minutes. On the y-axis, plot temperature difference in degrees. By creating a chart like this, we can see which metal transfers the most heat overall. This also gives us some information about each metal’s conductivity: The steeper the slope, the higher the conductivity.

Expected Result:

Copper will transfer the most heat, followed by brass. Steel is the poorest conductor of heat.

Scientific Explanation:

Copper has the highest heat conductivity value, while steel has the lowest heat conductivity value. Heat conductivity is a really important property of a material—we need to keep it in mind when we’re deciding what we’re going to use the material for! Here’s an example: Because copper is such a great conductor, we use it for things like heating rods and wires. Because steel is a poor conductor and can withstand high temperatures, we use it to build engines in airplanes.

Think back to when we folded our wire bridges in half twice. Why do you think we did this? Remember: conduction happens best when more molecules are in contact with each other. Folding the rod in half twice allows the heat from the hot cup to travel through more molecules, allowing more heat to travel from the hot cup to the cold cup. Folding the metal rods only once will still create a good heat bridge, but we would see a smaller temperature change in the cold cups, making it harder to see which metal is the best conductor!

As for the volumes of water needing to be equal? To get good data from our experiment, each hot water cup needs to hold the same amount of heat, and water has a very specific heat capacity. Heat capacity is how much heat energy it takes to change the temperature of a given amount of a substance. Think about it this way: all four of our cups have equal volumes of water at the same temperature, so that means that each hot water cup holds the same amount of heat energy.

So when heat conducts away from the hot cup, does all of that energy go through the metal bridge and into the cold cup? Not at all. Heat is often lost to its surroundings, and in this case, some of the heat from the hot water will be lost to the air. Similarly, the air in the room will lose some of its heat to the cup of cold water. We tried to minimize heat loss by using Styrofoam cups, because Styrofoam is known to be a great insulator—a material that’s a poor conductor of heat.

Further investigation:

Feel free to repeat this experiment with other metals! Metals like silver, gold, and aluminum will give you very different results. Just make sure that you keep all of the other conditions of the experiment the same.

Disclaimer and Safety Precautions

Water Volcano? The mixing of the vinegar and baking soda produce a volcano like foam. The answer? The mixing of the vinegar and baking soda produce acid-base reactant. The reaction creates carbon dioxide gas that bubbles up from the mixture.

Materials

• 3 12-inch long metal rods or thick wire: copper, steel, brass, or other metal. Make sure all the wires are the same gauge, or thickness. Why do you making sure the gauge is the same might be an important step?
• 8 identical Styrofoam cups
• Something to boil water in (a pot or kettle)
• Stove
• 4 instant digital thermometers
• Pitcher or other large container that will fit in the refrigerator
• Water
• Notebook and pen

Procedure:

1. Fill a pitcher or other large container with water and ice cubes. Allow the water in the pitcher to cool for at least half an hour.
2. Bend each metal rod in half two times to make metal bridges. Why do you think we should fold the rod in half twice? Would folding it once produce the same results?
3. Place the instant digital thermometers in each of the cups that will hold cold water.
4. Have an adult boil some water. Let it cool a bit before use.
5. For each pair of cups, pour equal volumes for hot water into the “hot” cup. Be sure the water covers the ends of the bridges.
6. For each pair of cups, pour equal volumes of cold water into the “cold” cup. Be sure the water covers the end of the bridges. Why do you think the volumes of water need to be equal?
7. Take the initial temperature of the cold water. Record the temperature in a chart listing the time (in minutes) and temperature (in degrees Fahrenheit).
8. Record the temperature of each cold water cup every 5 minutes for a total of 30 minutes. Your table should have which set it is (none, copper, steel, brass), time, and boxes to fill in for temperature. Do you think that all of the heat that’s conducted away from the hot cup goes into the cold cup? Why or why not? Hint: sometimes heat doesn’t always go where we want it to!
9. Which cup of cold water experienced the greatest change in temperature from the beginning to the end? Calculate this by subtracting the cup’s starting temperature from its final temperature.
10. Organize your data with line graphs. On the x-axis, plot time in minutes. On the y-axis, plot temperature difference in degrees. By creating a chart like this, we can see which metal transfers the most heat overall. This also gives us some information about each metal’s conductivity: The steeper the slope, the higher the conductivity.

Results:

Carbon-dioxide and sodium acetate were created while we mix the baking soda with vinegar.

Explanation:

The mixing of the vinegar and baking soda produce acid-base reactant. The reaction creates carbon dioxide gas that bubbles up from the mixture. The gas overflows as it inflates with bubbles. When vinegar and baking soda are first mixed, hydrogen ions of the vinegar reacts with the sodium and bicarbonate ions in the baking soda. The result of this initial reaction is two new chemicals, carbon dioxide and sodium acetate. This creates the bubbles and foam you see when we mix the baking soda and vinegar.

Further investigation:

Feel free to repeat this experiment with other metals! Metals like silver, gold, and aluminum will give you very different results. Just make sure that you keep all of the other conditions of the experiment the same.

Disclaimer and Safety Precautions