A.煤炭燃烧时加少量的水,可以使煤炭燃烧放出更多的热量 |
B.反应2Na2O2+2H2O = 4Na++4OH-+O2在任何条件下均能自发 |
C.已知P4(白磷,s)="4" P(红磷,s); △H =-29.2kJ·mol-1,则白磷比红磷稳定 |
D.已知H2的标准燃烧热为285.8 kJ·mol-1,则H2燃烧的热化学方程式表示为: |
A.25℃时,0.01NH4Cl溶液 | B.25℃时,0.01NaHSO4溶液 |
C.100℃时,0.01NaNO3溶液 | D.25℃时,0.01NaF溶液 |
A.①>②>③>④ | B.①>④>③>② | C.②>①>③>④ | D.②>③>④>① |
A.加热 | B.加少量水 | C.加少量盐酸 | D.加少量醋酸钠晶体 |
A.c(K+)+c(H+)=c(HCO3-)+c(OH-)+c(CO32-) | B.c(HCO3-)+c(CO32-)="0.1" mol/L |
C.c(CO32-)>c(H2CO3) | D.c(K+)+ c(OH-)=c(HCO3-)+c(H+)+2c(H2CO3) |
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