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Hydrogen Trivia Questions

Science Trivia Questions About the Chemical Element Hydrogen


Science Questions And Answers About the Chemical Element Hydrogen

Hydrogen is a chemical element with what chemical symbol?
A: H.

What is the atomic number for hydrogen?
A: 1.

What is the atomic weight of hydrogen?
A: 1.00794.

Hydrogen is the lightest element on the what?
A: Periodic table.

Its monatomic form (H) is the most "what" in the universe?
A: Abundant chemical substance.

Hydrogen constitutes roughly 75% of all what?
A: Baryonic mass.

Non-remnant stars are mainly composed of what?
A: Hydrogen in its plasma state.


The most common isotope of hydrogen, termed protium (name rarely used, symbol 1H), has what?
A: A single proton and zero neutrons.

When did the universal emergence of atomic hydrogen first occur?
A: During the recombination epoch.

Hydrogen readily forms covalent compounds with most what?
A: Non-metallic elements.

Most of the hydrogen on Earth exists in what form?
A: Molecular forms such as in the form of water or organic compounds.

Hydrogen plays a particularly important role in what type of reactions?
A: Acid–base.

When was hydrogen gas first artificially produced?
A: In the early 16th century, via the mixing of metals with acids.

In 1766–81, Henry Cavendish was the first to recognize that hydrogen gas was a what?
A: Discrete substance, and that it produces water when burned.


What does hydrogen mean in Greek?
A: "water-former".

Industrial production is mainly from what?
A: The steam reforming of natural gas.

Most hydrogen is employed near its production site, with the two largest uses being what?
A: Fossil fuel processing (e.g., hydrocracking) and ammonia production, mostly for the fertilizer market.

Hydrogen is a concern in metallurgy as it can what?
A: Embrittle many metals.

The Space Shuttle Main Engine burnt hydrogen with oxygen, producing what?
A: A nearly invisible flame at full thrust.

Hydrogen gas is highly what?
A: Flammable.

Hydrogen gas forms explosive mixtures with air if it is what?
A:  4–74% concentrated.


Hydrogen gas forms explosive mixtures with chlorine if it is what?
A: 5–95% concentrated.

The mixtures may be ignited by what?
A: Spark, heat or sunlight.

What is the hydrogen autoignition temperature?
A: In air, is 500 °C (932 °F)

Pure hydrogen-oxygen flames emit what type of light?
A: Ultraviolet.

Hydrogen flames in other conditions are what color?
A: Blue, resembling blue natural gas flames.

The destruction of the what, was an infamous example of hydrogen combustion?
A: Hindenburg airship.

H2 reacts with every what?
A: Oxidizing element.


Hydrogen can react spontaneously and violently at room temperature with what?
A: Chlorine and fluorine.

What is the ground state energy level of the electron in a hydrogen atom?
A:  −13.6 eV.

Protium, the most common isotope of hydrogen has how many electrons and protons?
A: One proton and one electron.

Unique among all stable isotopes, it has no what?
A: Neutrons.

H is the most common what?
A: Hydrogen isotope with an abundance of more than 99.98%.

Because the nucleus of this isotope consists of only a single proton, it is given formal name?
A: Protium.

The other stable hydrogen isotope, is known as what?
A: Deuterium.


Deuterium contains what in its nucleus?
A: One proton and one neutron.

 Essentially all deuterium in the universe is thought to have been produced when?
A: At the time of the Big Bang.

Deuterium is not radioactive, and does not represent a what?
A: Significant toxicity hazard.

Water enriched in molecules that include deuterium instead of normal hydrogen is called what?
A: Heavy water.

Heavy water is used as a what for nuclear reactors?
A: Neutron moderator and coolant.

 Deuterium is also a potential fuel for what?
A: Commercial nuclear fusion.