Tỷ số Axt/Akhông xt = 10-12 - Năng lượng hoạt hóa khi không sử dụng xúc tác lớn hơn khi có sử dụng xúc tác là 65 kJ/mol Hệ số R = 8.314 x 10-3 kJ. Mol Anh/chị hãy tính nhiệt độ phản ứng mà tại đó hằng số tốc độ phản ứng khi sử dụng xúc tác và không sử dụng xúc tác bằng nhau

There are 6.022 x 10^23 atoms of hg in 1 mole of hg. the number of atoms in 4.5 moles of hg can be found by multiplying 4.5 by 6.022 x 10^23 a. 2.7 x 10^24 b. 27 x 10^23 c. 2.71 x10^24 d. 27.099 x 10^23

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.