Hydrogen: Chemical Element Facts

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What is the most abundant chemical substance in the universe?

Oxygen

Hydrogen (correct)

Helium

Carbon

At standard conditions, hydrogen is a gas of diatomic molecules with the formula?

H4

H2 (correct)

H3

H

In the early universe, the formation of protons, the nuclei of hydrogen, occurred during the first?

Day after the Big Bang

Minute after the Big Bang

Second after the Big Bang (correct)

Hour after the Big Bang

Which type of bond does hydrogen readily form with most nonmetallic elements?

Single covalent bond Signup and view all the answers

What role does hydrogen play in acid–base reactions?

Donates protons Signup and view all the answers

What is the enthalpy of combustion for hydrogen gas?

286 kJ/mol Signup and view all the answers

At what temperature does hydrogen autoignite in air?

500 °C Signup and view all the answers

What types of mixtures form explosive combinations with hydrogen gas?

Air and chlorine Signup and view all the answers

What type of flames do pure hydrogen-oxygen flames emit?

Ultraviolet light Signup and view all the answers

What is the key role of hydrogen in the development of quantum mechanics?

It is the only neutral atom for which the Schrödinger equation can be solved analytically Signup and view all the answers

Hydrogen: Chemical Element Facts

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Questions and Answers

What is the most abundant chemical substance in the universe?

At standard conditions, hydrogen is a gas of diatomic molecules with the formula?

In the early universe, the formation of protons, the nuclei of hydrogen, occurred during the first?

Which type of bond does hydrogen readily form with most nonmetallic elements?

What role does hydrogen play in acid–base reactions?

What is the enthalpy of combustion for hydrogen gas?

At what temperature does hydrogen autoignite in air?

What types of mixtures form explosive combinations with hydrogen gas?

What type of flames do pure hydrogen-oxygen flames emit?

What is the key role of hydrogen in the development of quantum mechanics?

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