A:Al2(SO4)3溶液滴加氨水产生白色胶状沉淀:Al3++3OH﹣=Al(OH)3↓
B:纯碱溶液使酚酞变红:CO32﹣+2H2O⇌H2CO3+2OH﹣
C:乙酸清除水垢后的化学反应原理:2H++CO32﹣=CO2↑+H2O
D:FeCl3溶液中加入足量铁粉,溶液由黄色变成浅绿色:2Fe3++Fe=3Fe2+
下列属于相对性状的是( )
—It's hard to say. ______ people, I think.
根据句意,用括号中所给单词的适当形式填空。(1)What ____ you____ (do) this Monday? There____ (be) a football match.____ you ____ (go) with us?(2)I ____ (go) to see you as soon as I get to Beijing.(3)I think it ____ (be) rainy tomorrow.(4)My father ____ (send) me a new bike when I am tall enough.(5)We____ (visit) the Great Wall next week.(6)Who ____ (give) us a talk on the computer in two days?(7)They ____ (build) a new modern house near the river next year.(8)I want to know if he____ (be) back tomorrow.
酶是蛋白质因而具有蛋白质的特性,酶能催化许多有机化学反应。下图表示温度T(℃)与反应速度v关系的各曲线,有酶参加的是 ( )。
台湾岛是我国第一大岛。读图,回答问题。