Topic content:
① In the Fe3O4+4CO high temperature reaction of 3Fe+4CO2, ______ is an oxidant, ______ is a reducing agent, ______ element is oxidized, and ______ element is reduced
② Mark the direction and number of electron transfer with double line bridge or single line bridge: 2Na2O2+2H2O=4NaOH+O2 ↑
Best answer:
① Fe3O4+4CO high temperature. 3Fe+4CO2, the change of elemental valence is: Fe+2,+3 → 0 valence, C+2 →+4 valence, so the oxidant is
Fe3O4, The reductant is CO, carbon is oxidized and iron is reduced, so the answer is Fe3O4; CO; Carbon; Iron
② The elements with valence change in this question are all O elements in sodium peroxide, so sodium peroxide is both an oxidant and a reducing agent, and the electron transfer number is 2. So the answer is:
Answer analysis:
High temperature
Test core:
Essence of redox reaction: electron transfer (gain or loss or deviation) Characteristics of redox reaction: valence rise and fall (valence of some elements changes before and after reaction, which is the basis for judging redox reaction)