2. The air in a room has a mass of 50 kg and a specific heat of 1,000 J/kg*C. What is the change in thermal energy of the air when it warms from 20 to 30 degrees celsius?

Write the overall equation for the reaction for lithium battery

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

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.