A.CH4 ( g ) + 3/2O2 ( g ) = 2H2O ( l ) + CO ( g )△H1 |
B.S ( s ) + 3/2O2 ( g ) = SO3 ( s )△H2 |
C.C6H12O6 ( s ) + 6O2 ( g ) = 6CO2 (g) + 6H2O ( l )△H3 |
D.2CO ( g ) + O2 ( g ) = 2CO2 ( g )△H4 |
A.①②③ | B.②③④ | C.①③④ | D.①②③④ |
A.水的离子积不变 | B.水的pH变小,呈酸性 |
C.水的pH变大,呈中性 | D.水中的c(H+)=c(OH-)>1×10-7 mol/L |
A.c (CH3COO-)="c" (Na+) | B.c (OH-)>c (H+) |
C.c (CH3COOH)>c (CH3COO-) | D.c (CH3COOH)+c (CH3COO-)=0.01mol/L |
A.95 ℃纯水的pH<7,说明加热可导致水呈酸性 |
B.pH = 3的醋酸溶液,稀释至10倍后pH<4 |
C.0.2 mol·L-1的盐酸,与等体积水混合后pH = 2 |
D.pH = 3的醋酸溶液,与pH = 11的氢氧化钠溶液等体积混合后pH = 7 |
A.-483.6 | B.-241.8 | C.571.6 | D.285.8 |
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