【单选题】培养真菌时,培养基常加0.3%乳酸,其目的是
【单选题】______, that step is not safe!
【单选题】已知 25 °C时电极反应 MnO 4 - + 8 H + + 5 e - = Mn 2 + + 4 H 2 O 的 j Θ = 1 . 51 v ,若 [H + ] 由 1 . 0 mol ∙ L - 1 减小到 1 . 0×10 - 4 mol ∙ L - 1 ,则该电对的电 极电势变化值为
【单选题】\t已知25℃时,电对MnO 4 - /Mn 2+ (电极反应MnO 4 - +8H + +5e - =Mn 2+ +4H 2 O)的ψ θ (MnO 4 - /Mn 2+ )=1.51V,若此时[H + ]由1mol·L -1 减少到10 -4 mol·L -1 ,则该电对的电极电位变化值为()。
【单选题】已知 25 °C时电极反应 MnO 4 - + 8 H + + 5 e - = Mn 2 + + 4 H 2 O 的 E = 1 . 51 v ,若 [H + ] 由 1 . 0 mol ∙ L - 1 减小到 1 . 0×10 - 4 mol ∙ L - 1 ,则该电对的电 极电势变化值为
【单选题】______, that step is not safe.
【单选题】In order to improve communications with kids, parents should ______.
A.
learn more about the modern techniques and try to adjust all of them
B.
learn to use modern ways to communicate with kids, such as texting messages
C.
try to share some modern and meaningful computer games with kids
D.
earn enough money to buy modern machines for kids to satisfy their needs
【单选题】已知电极反应 MnO 4 - + 8H + +5e - Mn 2+ + 4H 2 O , φ y ( MnO 4 - / Mn 2+ ) = 1.51V ,求当 c ( H + ) = 0.1 mol·L -1 , c ( MnO 4 - ) = c ( Mn 2+ ) =0.5 mol·L -1 时, φ ( MnO 4 - / Mn 2+ ) 为( )。
【简答题】Jealous of the kids at school who are smarter than you and seem to learn more quickly? Don’t worry. 71 72 However, according to a recent study, IQ can rise—not just by one or two points, but by as man...
【简答题】电极反应 MnO 4 - + 8H + + 5e - = Mn 2+ + 4H 2 O 。已知 φ Θ ( MnO 4 - /Mn 2+ ) = 1.507 V , 若 c ( MnO 4 - ) = c (Mn 2+ ) = 1 mol∙L -1 , 当 H + 浓度为 10 mol∙L -1 时的电极电势为 ___。