Magic Mixture--Apple Dunk
YOU WILL NEED
- An apple
- Half of a lemon
- Shallow bowl
- Water
- Knife (ask a parent for help)
HERE'S HOW
Peel and slice an apple. Cover one slice with water in a shallow bowl. Sprinkle a second slice with the juice of half a lemon. Leave another slice exposed to the air. Wait about an hour, then compare. The slice with nothing on it turns brown.
WHY?
When an apple is cut open, chemicals inside the apple combine with oxygen from the air to form a brown coating. The coating keeps oxygen from getting deeper into the apple. Water protects the first slice from oxygen in the air so it stays white. Vitamin C in the lemon juice binds with oxygen, keeping oxygen away from the second slice, so it stays white the longest.
YOU WILL NEED
- A piece of paper
- A paper clip
- Thread
- Clear tape
- Scissors
- A strong magnet
HERE'S HOW
Cut a paper kite shape about three inches long and attach a paper clip to one corner. To the opposite corner, tape a piece of thread about eight inches long. Tape the other end of the thread to a flat surface. Use a strong magnet to pick up the paper clip and extend the string to full length. Hold the kite between your fingers and slowly move the magnet away from the paper clip. When you release the kite, it “flies,” unattached to the magnet.
WHY?
Magnets have a magnetic field, an invisible force that attracts some kinds of metal. Metal objects within the magnetic field do not have to touch a magnet to be pulled by magnetism.
Pour enough milk in the dinner plate to completely cover the bottom to the depth of about 1/4 inch. Allow the milk to settle. Add one drop of each of the four colors of food coloring - red, yellow, blue, and green - to the milk. Keep the drops close together in the center of the plate of milk. Find a clean cotton swab for the next part of the experiment. Predict what will happen when you touch the tip of the cotton swab to the center of the milk. It's important not to stir the mix. Just touch it...
http://www.stevespanglerscience.com/lab/experiments/milk-color-explosion
