2023届普通高等学校招生考试预测押题卷(二)2生物(河北)答案

2023届普通高等学校招生考试预测押题卷(二)2生物(河北)答案，目前大联考答案网已经汇总了2023届普通高等学校招生考试预测押题卷(二)2生物(河北)答案的各科答案和试卷，更多全国100所名校答案请关注本网站。

12.由合成气制备二甲醚的主要反应原理如下：①C0(g) H20(g)一C02(g) H2(g)△H1②2C02(g) 6H2(g)一CH,CH,0H(g) 3H20(g)△H2=-174.5kJ·mal1③CH,CH,0H(g)CH,0CH,(g)△H= 50.7kJ·mol-1已知：反应①中的相关的化学键键能数据如下：化学键C三0H-HC=0H一0键能/kJ·mol1071436803465下列有关说法正确的是A.反应①的焓变△H,=-38.0kJ·molB.CH,0CH,(g)—一CH,CH,OH)的△H>-50.7k·mOlC.使用高效催化剂，可以使反应②的△H,减小0(需管】D.反应3H,(e) 3G0(g)一GH,0CH,(g） C0,(g)的△H=-246.8,m我【答案】D/解折反应①的浴变：△州-艺C及应物就能）二之生成物镜能）：m1: 2×J·mol-2×803·mm436;mo本4,0m0.A项错提国为CHo0H,(gCH.CH.OH)的4H=-507刘生支的发数的大千0数△”一50日。m,B项错误：使用高效性化剂不能改支反应的冷变，C项错误根据盖斯定体可知反金0×3 ② ③可得反应3H,(g) 3C0(g)一CH,0GH,(g） C0,(g),故aAH=△H×3 △4， △，-246.8kJ·mol1,D项正确。

第四部分写作第一节短文改错It was getting dark,and my parents didn't come back home yet.Thinking about the supper,I stopped doing mybuthomework and decide to make a meal for my family instead of simple waiting.Since it was my first cooking,decidedsimplyI surfed on the Internet with my cellphone to get the detailed informations on how to do homely dishes.Followed theinformationFollowingstep-by-step directions,I managed to make my first dish,then another.When my parents came back home,theycouldn't believe their eyes A see the dishes made by me.While Mum was taken pictures,Dad couldn't wait to havetotakinga taste and gave her the thumbs up.Imagine how exciting I was!meexcited