氢变成氦的时候会释放能量。
太阳一类的恒星在其核心将氢聚变成氦。
Stars like our sun fuse hydrogen in their cores into helium.
它含有非常少的氢和氦。
它也可以按照组成部分被分解——氧和氢。
It could also be broken down into its component parts—oxygen and hydrogen.
锌置换了稀酸中的氢。
水可分解为氢和氧。
Water can be resolved [decomposed] into hydrogen and oxygen.
然后这些装置将氢和氧合成水，并在这个过程中释放电力。
These devices then combine hydrogen and oxygen to make water and liberate electricity in the process.
在另一项演示中，他们为华盛顿大学分析了细菌中的制氢过程。
In another demonstration, they analyzed hydrogen production in bacteria for the University of Washington.
需要改进技术，提高风能、太阳能和氢能在能源等式中的可行性。
Technological improvements are needed so that wind, solar and hydrogen can be more feasible parts of the energy equation.
通过测量一束头发上较重的氢和氧同位素的比例，科学家可以构建一个地理时间轴。
By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline.
因此，一些科学家推断，地球早期的大气与现在的不一样，主要由氢、甲烷和氨构成。
Therefore some scientists postulate that the Earth's earliest atmosphere, unlike that of today, was dominated by hydrogen, methane, and ammonia.
从后来的任务中得到的数据显示，在两极地下不到一米的地方有浓度相当高的氢，由此推断是水。
Data from a later mission indicates significant concentrations of hydrogen and by inference water less than a meter underground at both poles.
主要的差别是，相比于太阳，阿连德陨石缺失了大部分的挥发性元素，例如氢、碳、氧、氮和稀有气体。
The major difference is that Allende is depleted in the most volatile elements, like hydrogen, carbon, oxygen, nitrogen, and the noble gases, relative to the Sun.
面包含有碳水化合物，这是一种由碳、氢和氧组成的化学物质。
Bread contains carbohydrates, which are chemicals made up of carbon, hydrogen, and oxygen.
重水之所以重是因为水中氢的重量是普通氢的两倍（它的原子核中有一个质子和一个中子，而不仅仅是一个质子）。
Heavy water is heavy because the hydrogen in it weighs twice as much as ordinary hydrogen (it has a proton and a neutron in its nucleus, instead of just a proton).
研究了重氮烯氢向前手性烯烃单侧的非对映选择性转移。
Diastereoselective transfer of the diazene hydrogen to one face of the prochiral alkene was studied.
那是磷酸氢二钠七水合物。
苯并二氢吡喃具有类维生素A的生物活性。
氢氯氟烃和氢氟烃被认为是全球变暖的原因。
Hydrochlorofluorocarbons and hydrofluorocarbons are regarded as contributors to global warming.
我们将过硼酸钠与倍半碳酸钠和碳酸氢钠混合。
We mix sodium perborate with sodium sesquicarbonate and bicarbonate.
由于在酸性条件下形成，氢碘酸（HI）是一种更强的还原剂。
As formed under acidic conditions, hydroiodic acid (HI) is a stronger reducing agent.
合成碱绿色4的最佳条件包括：尿素和氯化锌作为催化剂，四氢呋喃和双色。
The optimal conditions for synthesis of alkali green 4 include the carbamide and zinc chloride as catalyst, chloranil and bichrome.
当容器内充满50万加仑的超冷液态氢时，绝缘泡沫可以防止冰在容器上形成。
The insulating foam prevents ice from forming on the tank when it is filled with 500,000 gallons of supercold liquid hydrogen.
水通过电解可以分解为氧和氢。
Water can be reduced to oxygen and hydrogen by electrolysis.
但是米特尔曼说，氢燃料车值得等待。
原子氢，单个质子，单电子。
没有氢元素则意味着没有水。
其他五种分别是：碳、氧、氮、氢和硫。
The others are carbon, oxygen, nitrogen, hydrogen and sulfur.
其他五种分别是：碳、氧、氮、氢和硫。
The others are carbon, oxygen, nitrogen, hydrogen and sulfur.
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