what is the part of the steam engine that does the work? the turbine the flywheel the cylinder the piston

The correct option is the piston

Explanation:

A steam engine is an engine that uses steam or vapour as it's working fluid. In steam engines, the pressure produced by the steam is used to move a piston inside a cylinder. The piston moves back and forth causing a rotary motion during the course of the engine's work. This steam is usually produced in a boiler (and later supplied from there) somewhere inside the engine. Steam engines were used in some production factories and they were also used in ships and locomotive trains.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

it would be a gas formation