For my chemistry project we have to "make" an invention. any ideas?
2006-11-21 03:02:01 · 3 answers · asked by Vanessa 2 in Science & Mathematics ➔ Engineering
i have often thought that a solar powered lawn mower would be an awsome idea......we only mow when the sun is out so why not make one that is ran by the sun and not gas!!!!!
please let me know if you try this!!!!!
2006-11-21 03:17:08 · answer #1 · answered by polarbaby 5 · 0⤊ 0⤋
Take a very light solucion of H2SO4. Make sure it is a 10-15% concentration. Write on paper with it. Pass it over a candle without burning the paper. What you wrote will become visible.
2006-11-21 11:35:06 · answer #2 · answered by Stefan B 1 · 0⤊ 1⤋
Someone already invented this, but maybe your teacher won't know that.
Light pole for battling the winter blues
http://www.instructables.com/id/E6FAQL12R9ES9J7TWF/
2006-11-21 11:18:11 · answer #3 · answered by DanE 7 · 0⤊ 0⤋