Why a chemical reaction doubles its speed by a 10c rise in temperature

Who is better, messi or cristiano, i need this for a chemistry class. asap

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this