How many sigma and pi bonds are present in the molecule hcn?

What reaction is taking place? 02 + c3h8 = h20 + co2

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

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