A Select the correct answer.
In which of these examples does chemical energy change to electrical energy?
A. digesting food
B. photosynthesis
O C. respiration
D. using a battery
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Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

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