We are using Janice VanCleave's 201 Awesome, Magical, Bizarre & Incredible Experiments for our Classical Homeschool group. I have to give it 5 stars out of 5 stars. The experiments are simple, the ingredients are easy to gather and best of all, the directions are easy to follow. We have done maybe 8 or 9 experiments so far, and they have all worked the way they are supposed to, and they all captured the interest of the kids.
The explanations for each experiment and discussion on concepts are brief, to the point - important science concepts are in bold to catch your eye, such as "osmosis" ...you are then free to find more resources on the subject if you wish, to flesh it out, or to just leave it be...which is nice, too, sometimes.
So far, the favorite experiments were the shrinking and na**ked egg. Big wow factor with all the kids, and again, very easy to set up.
If you are looking for just a little bit of science to round out your school year, short but not overwhelming..not a full on science curriculum...this would fit the bill.