Science experiments for grade4-

http://www.education.com/science-fair/article/Self-Inflating-Balloon/       (inflating balloon experiment)

http://www.education.com/science-fair/article/energy-from-garbage/       (making biogas)

http://www.education.com/science-fair/article/best-way-stains-out-of-clothes/     (stain remover)

http://www.education.com/science-fair/article/which-salt-melts-ice-the-quickest/      (salt melts ice)

http://www.education.com/science-fair/article/temperature-humidity-static-charges-last/      (temperature, air, humidity and static electricity)

http://www.education.com/science-fair/fourth-grade/?page=2   (4^th grade science experiments)

please go through the below mentioned website:
http://padlet.com/archana2804/bjmeid9443hm/wish/45332426