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hydrogen water
3 Questions about Chemistry (The best will get 20 marks)
答:
and shake for a few minutes. Calcium carbonate : It is insoluble in
water
. If the mixture is filtered the filtrate does not react with dilute hydrochloricacid. Calcium
hydrogen
carbonate : It is soluble in water. If the mixture is filtered the filtrate reacts with dilute hydrochloric...
Breaking up
water
into oxygen and
hydrogen
is a chemical change.为 ...
答:
change 本身既可以作为动词使用,也可以作为名词使用。在这里,因为有不定冠词"a",所以是做名词用。
...elements
water
is made are oxygen and
hydrogen
.
答:
1.C be made of 由...构成 2.A 3.A founded 建立,成立 4.B but for 若不是 5. A as 尽管 6.A 7.B 还未来得及 8.B 9.C 症状 10. c
谁能告诉我break down 和break up 的区别是什么?
答:
break up v.打碎, 破碎, 分裂, 结束, 衰落, 分解, 变坏, 驱散 break down v.毁掉, 制服, 压倒, 停顿, 倒塌, 中止, 垮掉, 分解 我感觉是break down在程度上更厉害些。
consist of和comprise的区别? 请不要复制词典的内容!最好给出一些例子...
答:
构成”,谓语用复数;contain “包含,容纳”,它的宾语只是整体的一部分,如:The book contains five photos;compose “构成”,表示许多部分构成一个整体,一般用被动;consist与compose同义,但不用被动,即consist of = be composed of,如:
Water
is composed of (= consists of)
hydrogen
and oxygen.
metals reacting with
water
答:
Magnesiumreacts with cold
water
and steam (water vapour at 100°C). When magnesium reacts with cold water magnesium hydroxide and
hydrogen
gas areformed. Mg(s) + 2H2O(l) → Mg(OH)2(s) + H2(g) However the reaction is very slow. When magnesium reacts with steam magnesium ...
what is the interaction of ethanoic acid in
water
?
答:
known as disperson forces beeen bonds therefore it doesn't mix well with
water
only HOWEVER with the aid of OH at the end. Here exsist a
hydrogen
bond & polar bond therefore ethanoic acid bee soluble in water. Moreover this makes ethanoic acid dissolve in polar/non-polar ...
求一段科普类的文章(要翻译成英语)
答:
Water
vapor, but the total amount of less than
hydrogen
. There are acetylene, ethane and phosphine. Jupiter's magnetosphere has been a huge package Around with the Earth's magnetosphere similar to, but charged particles within the magnetosphere the energy of the radiation of the Earth is about...
我想知道一些世界著名火山的中文和英文名称,包括他们的一些英文介绍,你...
答:
The truth is that a volcano seldom emits either smoke or flame, although various combinations of
hydrogen
, carbon, oxygen, and sulfur do sometimes ignite. What is mistaken for smoke consists of vast volumes of fine dust, mingled with steam and other vapors, chiefly sulfurous. Most of what ...
本人马上要进行英语演讲比赛,主题是“我们是否应当利用核能”,那位高...
答:
hydrogen
bombs in Alaska’s Aleutian Islands.But a lot has changed in the 35 years since then, and my views have changed along with these new circumstances.As a co-chair of the Clean and Safe Energy Coalition along with Gov. Christy Todd Whitman, I make it known often that I strongly ...
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