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Questions and Answers
What is the most abundant chemical substance in the universe?
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?
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?
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?
Which type of bond does hydrogen readily form with most nonmetallic elements?
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What role does hydrogen play in acid–base reactions?
What role does hydrogen play in acid–base reactions?
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What is the enthalpy of combustion for hydrogen gas?
What is the enthalpy of combustion for hydrogen gas?
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At what temperature does hydrogen autoignite in air?
At what temperature does hydrogen autoignite in air?
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What types of mixtures form explosive combinations with hydrogen gas?
What types of mixtures form explosive combinations with hydrogen gas?
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What type of flames do pure hydrogen-oxygen flames emit?
What type of flames do pure hydrogen-oxygen flames emit?
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What is the key role of hydrogen in the development of quantum mechanics?
What is the key role of hydrogen in the development of quantum mechanics?
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