Balance this chemical equation: _H2 + _O2 = _H2O. Your answer should be in this format: (1,1,1)

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.