Most of the wood used for fuel comes from native forests around the world. the harvesting of wood for an energy source has serious environmental implications. identify the environmental concerns of harvesting wood.
a) soil erosion
b) cost of harvesting
c) habitat destruction
d) habitat destruction and soil erosion

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?