您所在的当前位置：高中化学试题 >

阿伏伽德罗定律

> 已知同温同压下，气体的密度与它的摩尔质量成正比．一只气球若放在空气（空气平均摩尔质量为29g/mol）中可静止不动，那么在相同条件下该气球放在下列气体中会下沉的是（　　） A．O2 B．Cl2 C．CO2 D．CH4

问题：

发布时间：2024-09-10

已知同温同压下，气体的密度与它的摩尔质量成正比．一只气球若放在空气（空气平均摩尔质量为29g/mol）中可静止不动，那么在相同条件下该气球放在下列气体中会下沉的是（　　）

A．O₂ B．Cl₂ C．CO₂ D．CH₄

参考答案：

提问用户：oM***lu5

可能感兴趣的题目：

1 （12分）用数学归纳法证明：＝
2 当A=1时，下列程序： input“A=“；A A=A*2 A=A*3 A=A*4 A=A*5 print A end 输出的结果A是 [ ] A．5 B．6 C．15 D．120
3 如图所示甲、乙两个装置，已知A在地面上滑动时所受的摩擦力为40牛（不考虑绳与滑轮的摩擦）．要使A向右匀速滑动，拉力F 甲与F 乙的大小分别为 A.40牛，20牛 B.20牛，40牛 C.40牛，40牛 D.20牛，20牛
4 I keep a two dollar bill in my wallet that was given to me by my mother when I was six years old. The 31 goes with me wherever I go. My mother gave it to me so that 32 would follow me. She looked at me and said, “I want you to carry this two dollar bill for extra good luck.” “Thanks, mom,” I replied, “I will keep it 33 to me always.” My mother passed away when I was seven years old. I remember I took out my two dollar bill and held it in my hand for the longest time, knowing that she would 34 me the rest of my life. Each time I felt I had a crisis, I would 35 for my two dollar bill and set it on the table. I would 36 at it for several hours and could always 37 a solution. When I applied for my first job, I was thirty years old and very shy. The thought of being interviewed for a job was 38 but I had to work. I saw one of the interviewers well dressed with 39 purse and shoes. I also knew the chance of being chosen was 40 when looking at the length of others’ resumes. “What makes you feel you are 41 for this job?” The well－dressed woman asked. “I really need this job and there is nothing I can not do” I responded. She then asked me a series of questions and the interview was over. As I left, I 42 and said “Please give me a chance. I learn quickly and can be a very 43 member of your team.” I went home, 44 . That evening I received a phone call. “Gina” she said, “we decided to give you a chance to 45 yourself.” “Thank you, you will not regret this decision.” I 46 the phone and yelled. At that instant, I remember my mom once said to us “You are 47 in my mind. Don’t 48 failure. It is a way to get us to try harder.” How 49 this gift from Mom! It had built up 50 in me. 小题1: A．money B．check C．bill D．paper 小题2: A．luck B．happiness C．wealth D．wisdom 小题3: A．close B．near C．hard D．firm 小题4: A．look out for B．watch over C．see to D．come across 小题5: A．get B．stretch C．hold D．reach 小题6: A．stare B．glance C．observe D．glare 小题7: A．come up with B．put forward C．set up D．pull through 小题8: A．exciting B．amazing C．nervous D．scary 小题9: A．suitable B．matching C．fancy D．exaggerating（夸张的）小题10: A．slim B．terrible C．few D．abundant 小题11: A．born B．qualified C．stable D．grateful 小题12: A．turned around B．turned back C．put up D．raise up 小题13: A．productive B．additional C．concise（简洁） D．effective 小题14: A．terrified B．exhausted C．sound D．cautious 小题15: A．test B．challenge C．prove D．strengthen 小题16: A．hung up B．got through C．set aside D．got off 小题17: A．brilliant B．awesome C．careful D．unbelievable 小题18: A．stand B．bend C．fear D．ruin 小题19: A．rare B．special C．relative D．primary 小题20: A．confidence B．perseverance C．model D．intelligence
5 被称为“分类学之父”的是 A.海克尔 B.林奈 C.魏泰克 D.达尔文
6 设x，y满足约束条件 x-y≥-1， x+y≤3， x≥0， y≥o，则z=x-2y的取值范围为______．
7 生物的分类单位，由大到小次序不正确的是 A.门--纲--科--种 B.纲--目--科--种 C.纲--门--目--科 D.目--科--属一一种
8 They are not ________ to go to school. A.enough old B.old enough C.too old D.old too
9 下列用途主要是体现铝的物理性质的是 ①家用铝锅 ②盛浓硝酸的容器 ③制导线 ④焊接钢轨 ⑤包装铝箔 ⑥炼钢的脱氧剂 ⑦做防锈油漆 ⑧做合金用作飞机制造业材料 ⑨工业做热交换器 A．①②③④ B．⑥⑦⑧⑨ C．①③⑤⑦ D．②④⑥⑧
10 以下河流中结冰期最长的是 A.松花江 B.长江 C.黄河 D.珠江

已知同温同压下，气体的密度与它的摩尔质量成正比．一只气球若放在空气（空气平均摩尔质量为29g/mol）中可静止不动，那么在相同条件下该气球放在下列气体中会下沉的是（ ） A．O2 B．Cl2 C．CO2 D．CH4

可能感兴趣的题目：

已知同温同压下，气体的密度与它的摩尔质量成正比．一只气球若放在空气（空气平均摩尔质量为29g/mol）中可静止不动，那么在相同条件下该气球放在下列气体中会下沉的是（　　）

A．O₂ B．Cl₂ C．CO₂ D．CH₄