题目

阅读下列短文内容, 选出最佳答案。Dear Kate, I need your help. Could you please take these things to your brother Bob: his dictionary, pen, notebook, keys, and a baseball. The dictionary is on the bed. The pen is in the pencil case. I put the pencil case on the sofa. The notebook is on the desk. The keys are on the dresser. The baseball is under the bed. Thanks, Grandma. (1) Kate is Bob's________. A . sister B . mother C . grandma D . brother (2) Where's Bob's dictionary? A . On the sofa. B . On the desk. C . On the bed. D . on the floor 能源是现代社会发展的支柱之一。(1)化学反应中的能量变化,通常主要表现为热量的变化。①下列反应中,属于放热反应的是___________(填序号)。a. Ba(OH)2·8H2O与NH4Cl混合搅拌b. 高温煅烧石灰石c. 铝与盐酸反应②某同学进行如下图所示实验,测量稀盐酸与烧碱溶液中和反应的能量变化。实验表明:反应温度升高,由此判断该反应是_______(填“吸热”或“放热”)反应,其离子方程式是_______________。(2)电能是现代社会应用最广泛的能源之一。下图所示的原电池装置中,其负极是_____________________,正极上能够观察到的现象是____________________________,正极的电极反应式是_________________________。原电池工作一段时间后,若消耗锌6.5g,则放出气体__________g。
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