There are a number of simple scientific experiments that kindergarteners can set up for a science fair, with one such example being a sunprint, which shows how the sun's energy can cause chemical changes by placing objects on photosensitive paper. The objects will block the sunlight, highlighting the contrast between the exposed paper and the protected parts through color change.
This experiment is both simple and quick to produce results. All that is needed is some photosensitive paper, a watch or clock, a number of objects (anything from stones to coins, although if at least one object has some translucency better effects can be achieved), a tub of water and direct natural sunlight.
- Arrange the paper with the blue side facing the sun
- Remove the objects and soak the paper
Once the paper has been placed, the objects can then be arranged on the surface. Try to arrange them so they are not too close together. Leave the paper and objects in sunlight for around 2 minutes.
Once the time is up, remove the objects (careful with stones and metal as they may be warm), then soak the paper in the water for around 1 minute before hanging it up or leaving in the sun to dry.
Once the paper has dried out, the silhouettes of the objects will be clearly visible, showing how sunlight has changed the color of the exposed paper.