Design an experiment to show that the heat flow between adjacent objects of different temperatures is greater when the temperatures is greater

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

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.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?