Ethanol is a possible fuel. use average bond energies to calculate δhrxn for the combustion of ethanol. ch3ch2oh(g) + 3 o2(g) → 2 co2(g) + 3 h2o(g) express your answer as an integer.

What effect might melting sea ice have for people who live in coastal areas?

What material does not melt at any temperature

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.