第2题
第3题
第4题
What is the oxidation state of iron in pyrites, FeS2? Is the anion diatomic? What physical measurements could be performed to test this hypothesis?
第5题
Explain why aluminium(III )is the only stable oxidation state of aluminum in this compounds,in contrast to thallium,which has states of+1 and+3.
第7题
The oxidation of the decayed dead algal bodies can't ______ .
A.lower the amount of oxygen in the fiver water
B.make the water taste badly
C.make the water unsuitable for human consumption
D.make the bacteria dead
第8题
There isn't sound proof to support his biological theory.
A.financing
B.publications
C.evidence
D.appreciation
第10题
A.Y
B.N
C.NG