皮皮学，免费搜题
登录
搜题
【简答题】
有限的元素可组成种类繁多的物质．依据表中元素回答下列问题． 元素名称 氢 碳 氧 氯 钠 铁 元素符号 H C O D Na Fe （1）某固体单质在氧气中燃烧火星四射，生成黑色固体．写出该反应的化学方程式______． （2）若某固体单质在完全燃烧和不完全燃烧时，生成不同的气体，该固体不完全燃烧时反应的方程式为______． （3）若某可燃性气体由两种元素组成，一定含有的元素是______，可能含有的元素是______． （4）若X和Y反应生成两种维持人体正常生理活动所必需的物质．向X溶液中滴加2～3滴无色酚酞试液，溶液变红；再滴加Y溶液至溶液无色．则X是______（填化学式，下同），Y是______． （5）若某元素的单质A及其氧化物B均与D溶液反应，分别生成该元素的化合物E和F，且这种元素在B和F中的化合价相同．B与D反应的化学方程式为______；工业上用F和H 2 在300～350℃时反应制得D和E，该反应的化学方程式为______．
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】根据所用基质的属性,可以将基质栽培再分为( )、( )、( )。
【单选题】Listen to the following dialogue, and then choose the best answer for the question. Q: What did the man mean?
A.
He wrote it last semester.
B.
He ' ll finish it in a few minutes.
C.
He isn ' t going to write it.
D.
He never does assignments early.
【单选题】Listen to the following dialogue, and then choose the best answer for the question. Q: What did the man mean?
A.
He hadn ' t been there.
B.
He didn ' t like it.
C.
He didn ' t care.
D.
He wasn ' t careful.
【简答题】通常根据网络范围和计算机之间的距离将计算机网络分为 、 和
【单选题】Listen to the short dialogues and choose the best answer to each question. What does the woman mean?
A.
She will show the man the schedule.
B.
She lost her copy of the schedule.
C.
She doesn't think the man has an appointment with Ms Lee.
D.
She finds a mistake in the schedule.
【单选题】Listen to the following dialogue, and then choose the best answer for the question. Q: What does the woman mean?
A.
She couldn' t make up her mind.
B.
She doesn' t have time for a job.
C.
She' d like to have a company of her own.
D.
She has a mind of her own.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
