A. chemical B. physical C. biological D. geological 相关知识点: 试题来源: 解析 A。氢气和氧气反应生成水是化学变化。B 选项 physical 是物理变化;C 选项 biological 是生物变化;D 选项 geological 是地质变化,都不符合题意。反馈 收藏
Why is hydrogen important as a future clean energy source? A fuel is a chemical that can be ‘burnt’ to provide useful energy. Burning normally means that chemical bonds between the elements in the fuel are broken and the elements chemically combine with oxygen (often from the air). ...
(b) Name a substance that can be used as the inert electrode.(c) What kind of gas is produced in anode?(d) Where is hydrogen produced in the electrolytic cell? 相关知识点: 试题来源: 解析 (a) Electrolysis is the process of using an electric current to drive a chemical reaction that w...
Verb1.hydrogenate- combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound) alter,change,modify- cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "Th...
Hydrogen acts as a chemical energy carrier, rather like oil or gas, that can be piped or transported to where it is needed. It stores three times as much energy per unit of mass as conventional petrol, and when it “burns” in air – releasing that stored energy – it simply combines ...
百度试题 结果1 题目In chemistry, H₂O is the chemical formula for? A. Hydrogen oxide B. Hydroxide C. Water D. Hydrogen peroxide 相关知识点: 试题来源: 解析 C。H₂O 是水(Water)的化学分子式。反馈 收藏
chemicalTo the Editor:Hydrogen peroxide is a strong oxidant,which is commonly used as a disinfectant mainly in medical and chemical workplaces.Hydrogen peroxide poisoning causes brain infarction,and ingestion of hydrogen peroxide injures the upper gastrointestinal tract.[1]Besides,food poisoning is often...
①HYDROGEN HAS been controversial ever since the tragedy of the Hindenburg, an airship filled with it that went down in flames in 1937. ②Boosters say that the gas is a low-carbon miracle which can power cars and homes. ③The hydrogen economy, they hope, will redraw the energy map. ④...
When it comes to power, hydrogen is one of the most energy dense fuels. One kilogram of hydrogen gas generates the same amount of energy as almost three kilograms of gasoline, making the chemical element a highly efficient fuel source. With water and heat as its only by products, hyd...
Include a chemical equation to show the reaction which occurs.5](iii) Name one raw material which is a source of the hydrogen used in the Haber process.[1](b)Ammoni a is a base and reacts with sulfuric acid to form the salt, ammonium sulfate.(i) What is meant by the term base?[...