Scientists have grown progressively more worn the potential for climate change caused by increasing at mospheric carbon dioxide levels. the world burns the fossil fuel equivalent of approximately 9.0 x 1012 kg of petroleum per year. assume that all of this fossil fuel is in the form of octane (c hs) and calculate how much co2 in kilograms is produced by world fossil fuel combustion per year. (hint: begin by writing a balanced equation for the combustion of octane.) if the atmosphere currently contains approximately 3.0 x 1015 kg of co2, how long will it take for the world's fossil fuel combustion to double the amount of atmospheric carbon dioxide?

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

answer: gold foil experiment - he shot alpha particles at a gold foil

explanation:

35. a insulated cylinder of solid gold (k 310 kw/m-k) of radius v2 m and height 5 m is heated at one end until the temperature at each point in the cylinder is given by w(r, y, z) (30 z2)(2-(r2+ y2). determine the rate of heat flow across each horizontal disk given by z 1, z 2, and z 3, identifying which has the greatest rate of heat flow across it.

explanation: