All projects
55 projects for age 9 · page 4 of 5
Projects
Tin-Can Telephone
Sound travels as vibrations along the tight string from one cup to the other.
Blow-Straw Painting
Moving air pushes the runny paint into branching, spidery shapes.
Homemade Fizzy Lemonade
Baking soda reacts with the lemon's acid to make bubbles — you're carbonating your own drink.
Ice Excavation Rescue
Warm water, salt and gentle tools all speed up melting — salt lowers the temperature ice melts at.
Fizzy Sherbet Sweets
Citric acid and baking soda are dry until they hit the wet on your tongue — then they fizz (that same gas reaction!).
🔒 PremiumWormery in a Jar
Worms mix and tunnel through soil — you can watch them build layers and help the garden.
Dancing Raisins
Fizzy bubbles cling to the rough raisins and lift them up; at the top the bubbles pop and they sink - over and over.
Invisible Lemon Ink
Lemon juice browns faster than plain paper when warmed, revealing the writing - a gentle heat reaction.
Ice Cream in a Bag
Salt makes ice melt at a colder temperature, pulling heat from the cream so it freezes.
Junk Robot
Design and imagination - planning a build from the parts you have.
Cardboard Marble Run
Gravity, slopes and speed - steeper ramps make the marble go faster.
🔒 PremiumBread in a Bag
Yeast is alive — it eats sugar and burps gas that makes the dough rise.