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提问人：网友zouhao1985 发布时间：2022-01-07

[主观题]

Pure hydrogen does not occur naturally on Earth in large quantities, and it is locked up i

n enormous quantities in water, hydrocarbons, and other ______. One of the challenges of using hydrogen as a fuel comes from being able to efficiently extract hydrogen from these compounds (化合物).

A、plants

B、organic matter

C、fossil fuels

D、inorganic matter

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更多“Pure hydrogen does not occur naturally on Earth in large quantities, and it is locked up i”相关的问题

第1题

Manufacturers of hydrogen generators have developed methods to use lower amounts of electricity to split water into hydrogen. Different electrolytes or catalysts are used in _______ the bonds between hydrogen and oxygen atoms that make up water.

A、loosening

B、strengthening

C、separating

D、splitting

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第2题

The scientists and researchers have mostly decided that using nuclear power plants that are currently online may be able to produce hydrogen fuel as a byproduct of the water that they are already using to cool the ____.

A、nuclear tower

B、reactors

C、nuclear fusion

D、nuclear fission

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第3题

In electrolysis, electricity is run through water to separate the _____ and _____ atoms.

A、hydrogen, water

B、hydrogen, energy

C、hydrogen, oxygen

D、water, heat

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第4题

______ is an energy form found in nature that has not been subjected to any human engineered conversion process. It is energy contained in raw fuels, and other forms of energy received as input to a system.

A、Primary energy

B、Premium energy

C、Principal energy

D、Preliminary energy

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第5题

Landfills and farms can have high concentrations of _____ which is hydrogen-rich chemical compound.

A、methane

B、carbon dioxide

C、oxygen

D、hydrocarbon

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第6题

A raging river contains ____ energy ____a small stream.

A、less, than

B、more, than

C、same, with

D、all possibilities above

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第7题

Most of today’s hydrogen is produced from natural gas through a process called steam methane reforming. This is where steam and _______come together under high temperature to produce hydrogen.

A、water

B、methane

C、hydrocarbons

D、oxygen

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第8题

Beams of sunshine are waves of light and heat energy, radiated across 93 million miles of space to reach our earth in about ________.

A、a second

B、eight minutes

C、an hour

D、a year

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第9题

Sunlight reaches us by radiation. Radiation travels in electromagnetic waves consisting of ______, and when the energy waves reach an object, they can either pass through it, or be reflected, or be absorbed, depending on the material. PVs are made out of a semi-conducting material. When they absorb photons of sunlight, the energy of the photons dislodges electrons from their atoms. The PV’s special coating attracts free electrons to the surface, and it is this movement of electrons that produces the electrical current.

A、electrons

B、photons

C、neutrons

D、atoms

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第10题

Floatovoltaics reduce the need of valuable land area, save drinking water that would otherwise be lost through ______, and show a higher efficiency of solar energy conversion, as the panels are kept at a _____ temperature than they would be on land.

A、evaporation, cooler

B、evaporation, hotter

C、precipitation, cooler

D、precipitation, hotter

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