The sound of a bus passing by is an example of an (open, efficient) system because some chemical energy is transformed to sound and other energy is transformed to (thermal, electric) energy and mechanical energy. Which two is it. Need ASAP

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %