What is the charge of an electron? What charge does oxygen have? What is the number of protons in hydrogen? What is the symbol for hydrogen ion? How many electrons are in a hydrogen ion? What charge do nonmetals have? What is a hydrogen bond?
解析 A核心短语/词汇:help sb./ sth. (to) do sth. 帮助某人/某物做某事句子译文:氧气是唯一的助燃气体吗? 本题考查定语从句。___helps fire burn 用来修饰之前的名词gas, 该从句的引导词在定语从句中做主语,不能省略,先行词有only 修饰时不能用which; what 不能引导定语从句,故选项A符合题意。反馈...
What do hydrogen bonds connect? What is a hydrogen bond acceptor? What kind of bond is carbon and hydrogen? What is an example of a hydrogen bond? Is H2O a hydrogen bond? What type of bond joins two hydrogen atoms? What type of bond does hydrogen and oxygen form?
Oxygen is necessary for animals to breathe and produce energy. Without air, animals cannot survive. 氧气是动物呼吸和产生能量所必需的。没有空气,动物无法生存。 Space 空间 Animals need enough space to move, hunt, and interact with oth...
Renewable hydrogen is hydrogen derived from water. It’s created using a process called electrolysis, wherein electricity from renewable sources is used to split the hydrogen molecules from the oxygen molecules in water. Because the electricity used here comes from renewable sources, there are no gr...
Heat generated by consumption of 1 liter of oxygen when food is oxidized
解析 C 关系代词what在这里引导一个名词性从句作to be的表语,同时what在表语从句中又为is的表语成分,这类语法结构还有,如:Show what you have written.(把你所写的给我们看看)和She is not what she was a few years ago.(她可不是几年前的她了)。其他选项均不能表示这种语法关系。
Net zero is an ideal state where the amount of greenhouse gases released into the Earth’s atmosphere is equal to the amount removed. Emission removal and reduction through decarbonization efforts are needed to reach net zero.
The smallest representative unit of a single chemical element is an atom. Atoms of different elements can form a lasting attraction known as a chemical bond. If this is an ionic bond, then the atoms have net opposite charges, so there is an electrostatic attraction...
What type of bond is formed by the attraction between partially charged regions of polar molecules? a. covalent bonds b. ionic bonds c. hydrogen bonds Polar Molecule: The smallest representative unit of any covalent chemical compo...