You will find some great ideas for science experiments and making models at a website called Sciencecastle.com.
Sciencecastle.com claim to be the 'world's fastest growing online science community for kids'. The site includes many online science classes, science projects and science kits which should be ideal for students at class 7 stage. There are different levels of membership available, some free and some paid dependent of how many of the projects and kits you wish to access.
Another great site that will give you lots of ideas for easy science working models is a site called scienceproject.com. The site is regularly updated with lots of new projects and they are also divided in classes. Therefore you should head to www.scienceproject.com/projects/index/intermed.asp which is for grades 7-8 and so all the projects featured will be ideal for the age of your class of students. Within the age range sections the projects are also divided into what type of science they are best suited to. The sections are physics, meteorology, chemistry and biology. They also rather usefully class each experiment by its length and so you can choose the quick ones if you need a speedy project or take a more in depth one if you want a more lengthy experiment.
Sciencecastle.com claim to be the 'world's fastest growing online science community for kids'. The site includes many online science classes, science projects and science kits which should be ideal for students at class 7 stage. There are different levels of membership available, some free and some paid dependent of how many of the projects and kits you wish to access.
Another great site that will give you lots of ideas for easy science working models is a site called scienceproject.com. The site is regularly updated with lots of new projects and they are also divided in classes. Therefore you should head to www.scienceproject.com/projects/index/intermed.asp which is for grades 7-8 and so all the projects featured will be ideal for the age of your class of students. Within the age range sections the projects are also divided into what type of science they are best suited to. The sections are physics, meteorology, chemistry and biology. They also rather usefully class each experiment by its length and so you can choose the quick ones if you need a speedy project or take a more in depth one if you want a more lengthy experiment.