UC知道超一流的化学高手、化学专家请进(Periodicity 0005)
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超一流的化学高手、化学专家请进(Periodicity 0005)
请用英文解答，谢谢。
What property of the first six elements of Period 3 (sodium to suplphur) continuously increase numerically?
What are the trends concerning period 3 elements from sodium to chlorine?
Elements Q and R are from period 3.
(a) Element Q forms an oxide that is soluble in both acidic and
alkaline medium.
(b) Element R forms an oxide that is insoluble in water but soluble
in alkali.
State, giving reasons, the identity of each element.
Write balanced equations for any reactions that take place.
Thanks.
请用英文解答，谢谢。
What property of the first six elements of Period 3 (sodium to suplphur) continuously increase numerically?
What are the trends concerning period 3 elements from sodium to chlorine?
Elements Q and R are from period 3.
(a) Element Q forms an oxide that is soluble in both acidic and
alkaline medium.
(b) Element R forms an oxide that is insoluble in water but soluble
in alkali.
State, giving reasons, the identity of each element.
Write balanced equations for any reactions that take place.
Thanks.
1，their non-metallic property increase numerically
2,their atom size decrease from sodium to chlorine
3,Q is the Al which form Al2O3 with oxygen. It is an amphoteric oxide.
4Al+3O2==2Al2O3 Al2O3+6HCl=AlCl3+3H2O Al2O3+NaOH==NaAlO2+H2O
R is an non-metallic atom so that it may form a oxide that will solute in alkali. So it may be the SiO2.So R is Si.
SiO2+2NaOH==Na2SiO3+H2O