/sci/ - Science & Math

Making a rocket with the chemistry class from a rocket kit that uses baking soda and vinegar, but we want something with a bit more... oomf. Any ideas for two reagents that will react to give a high volume of gas with a low heat output (we don't want to melt the bottle :P)
At the moment I was thinking of dry ice, but can't think of what will convert it to it's gaseous form spontaneously without too much heat given off.

biology student at nottingham uni. What can I do to help this wonderfully bearded man??

Hey /sci/ my chemistry teacher is leaving soon, and our class wants to get her a present. Together we could rustle together about £100, but it kinda needs to be soon. Any ideaaas?

Help i have homework due, but i dont even know were to start on this problem.

a 50kg rider is on a moped of mass 75kg is traveling with a speed of 20m/s. each of the two wheels of the moped has a radius of 0.2m and a moment of inertia of 0.2kg*m^2.
what is the total rotational kinetic energy