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(3 Points)
2) 3 points
C2H4 + 02 → _C02 + _H20
What mass of carbon dioxide is formed when 64 g of ethylene (C2H4) is burned in 140 g of oxygen?
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Which produce would best increase the amount of heat energy that is actually gained by calorimeter b

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?