How does a steam engine do work?
(a) steam turns a turbine.
(b) steam enters a cylinder and pushes a piston.
(c) steam expands and spins an axle.
(d) steam causes wheels to turn.

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

How many moles of gas are present if p=11 atm, v=12l, t=185k?

What must occur for air masses to form fronts