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Well, today we are going to share how we did three different experiments in one day. All of the experiments were taken from Exploring Creation with Chemistry and Physics (Young Explorer Series). It was very great to see how Tom looks very happy doing science. This science is really different with the testing science that our government has which asks learners to memorize definition and has less explanation or analysis.
First of all, before we do a science experiment, we always start we theory or “story” in the text book. Next, we read the experiment carefully before we move out to the kitchen or the toilet or the laundry area where we do most of the experiments.
Here is the concept of density that we discussed in these three different experiments:
Density is how much mass is in a certain volume of matters.
- 2 eggs
- 2 glass filled half with hot water
- half cup of salt
- After some hot water is filled into both cups, put half cup of salt into one of the glasses.
- Put the eggs in the glasses, each has one.
- Observe what happen
- Discuss with kids why it happens
Conclusion: The egg in the salty water floats because the salty water is denser than the egg. In other words, there are “more matters” in the salty water than the egg so that the water can defeat the egg. I tried to explain that to the younger learner. It might not exactly correct, but it makes more sense for him.
- 4 plastic glasses filled with warm water
- 4 food coloring: red, blue, green, and yellow or any contrast color
- 10 tablespoons salt
- a transparent straw (I used the water mineral straw)
- Fill all 3/4 of the plastic glasses with warm water
- Drop some food coloring into each of the glasses
- Put the colored water in a row: red, blue, green, yellow
- Put 1 tablespoon salt to the red water, 2 tablespoons salt to the blue water, 3 tablespoons salt to the green water, 4 tablespoons salt to the yellow water. Stir each of the glass.
- Put one end of the straw (about 1 inch) to one color, for example blue. You might start with any color. Close the other end of the straw with your finger to hold the water inside the straw.
- Go to another color, for example red, with still a color inside the transparent straw and one finger still close the other end of the straw. Don’t release your finger yet.
- Put one end of the straw (about 2 inch) to another color, red for example. Release your finger in a short time to get the red water sucked in the straw about the same length as the first color.
- Go to another color, for example green, with still 2 first colors inside the transparent straw and one finger still close the other end of the straw. Don’t release your finger yet.
- Put one end of the straw (about 3 inch) to another color, green for example. Release your finger in a short time to get the red water sucked in the straw about the same length as the 2 colors.
- Do the same steps with deeper straw dip.
Conclusion: The colors in the straw are not mixed up because each of them has different density. The denser color will stay at the very bottom.
- Some Aluminium foil to make a ship
- A bucket or a large pan to float the ship
- Warm water
- Coins as many as you have
- 1/4 cup of salt
- Folding the aluminium foil into a boat. You might follow this video if you want:
- Fill the bucket or large pan with warm water.
- Put the salt into the bucket or large pan.
- Float the boat on the water.
- Fill in the boat with coins one at a time.
- Observe how many coins put inside the boat that can start sinking the boat.
Conclusion: The boat sinks as soon as the density of the coins is bigger than the salty water. It means that the boat with the coins can defeat the salty water.