【单选题】一定温度下,对某一反应 A(g)+3B(g) 2C(g),反应放热,以下说法不正确的是( )
C.
1molA与3molB混合充分反应能得到2mol的C
【单选题】In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.The key to SNMP(76)is its simplicity. It has a small command ...
【单选题】Information from the station and installation shall be appropriately shared by _____
B.
all the watch keeping personnel
【单选题】已知A、B两种物质反应生成C:A+B C。用7 g A和2 g B或4 g A和5 g B充分反应都可得6 g C,现取A、B固体混合物共9 g,充分反应后得到7.5 g C。此混合物中A和B的质量分别是( )。
C.
A为6.5g、B为2.5g或A为5g、B为4g
【多选题】反应A(g)+B(g) C(g) +D(g)过程中的能量变化如图所示,则下列说法正确的是
D.
改变压强与加催化剂对反应的影响原因相同,都不会使平衡发生移动
【单选题】The following information was obtained from the accounting records of Stevenson Incorporated: Direct materials purchased $80,000 Direct materials used $54,000 Direct manufacturing labor costs $12,000 ...
【简答题】VII. 书面表达,按照备忘录的要求选择合适的信息 : John Brown is an instructor of a school. He is writing a memo about career plan to the students. Please help him put the information given into the memo. John Brown 是一所学校的就...
【简答题】①在化学反应中,80g A和2g B恰好完全反应,生成40g D,则生成C的质量是______g ②在化学反应中,3g A和足量B反应,可得11g C.如有12g A,能和______g B完全反应 ③若24.5g氯酸钾与2g二氧化锰的混合物加热到质量不再减少为止,得剩余固体的质量为16.9g,则反应生成的氧气的质量为______g. ④将m克A和n克B混合,A和B发生化学反应生成C.待反应完毕后...
【单选题】在A+B==C+2D的化学反应中,18g的A和16g的B恰好完全反应生成28g的C,则反应生成的D的质量是 [ ]
【单选题】对可逆反应A(g)+B(g)?C(g)(正反应为吸热反应),下列图象正确的是( )