The iron content of copper to the number, can be a magnet suction up

Answer:

(3) according to ge (Ge) and carbon is the main group elements, similar in nature, can react with NaOH to produce a solution of germanate in the presence of H2O2, known as reactants and products to trim chemical equation is Ge+2H2O2+2NaOH=Na2GeO3+3H2O, so the answer is: Ge+2H2O2+2NaOH=Na2GeO3+3H2O.

(2) acidic electrolytic water solution, the water to generate hydrogen peroxide, the oxidation reaction, so it should be produced at the anode; a BH4- is oxidized to BO2-, should be the negative reaction of galvanic, electrode reaction is BH4-+8OH--8e-=BO2-+6H2O, using MnO2 B electrode as cathode, H2O2, redox reactions, electron reduction generate OH-, MnO2 as electrode material and catalysis,The answer is: the anode; BH4-+8OH--8e-=BO2-+6H2O; MnO2; the electrode reaction may have catalytic effect;

(1) a qualitative comparison between Fe3+ and Cu2+ on the catalytic effect of H2O2 decomposition, can produce bubbles by observing the speed of comparison, bubble fast, good catalytic effect on Fe3+ and Cu2+; catalytic effect on the decomposition of H2O2, other conditions must remain the same, so will be changed to FeCl3 Fe2 (SO4) 3 is more reasonable, can avoid the interference caused by different anions;Quantitative comparison of Fe3+ and Cu2+ on the catalytic effect of H2O2 decomposition, it can be seen from the figure, the gas can be produced by the determination of a certain period of time (gas or determination of a certain volume of the time required) to compare. More gas produced in a certain period of time or have a certain volume is shorter, while the catalytic effect the better, that measured gas produced in a certain period of time (or the time required for the determination of 40mL gas),The answer is: the rate at which the bubbles are generated; the interference of anions; the time required for the generation of 40mL gas;