Podcast
Questions and Answers
What is the key difference between parahydrogen and orthohydrogen?
What is the key difference between parahydrogen and orthohydrogen?
- Number of protons
- Electron arrangement
- Number of neutrons
- Nuclear spin direction (correct)
What happens to the ratio of para form to ortho form in hydrogen gas when cooled to 20K?
What happens to the ratio of para form to ortho form in hydrogen gas when cooled to 20K?
- 25% para, 75% ortho
- Stays the same
- Becomes almost pure parahydrogen (correct)
- Becomes almost pure orthohydrogen
How are the two nuclei in a dihydrogen molecule different?
How are the two nuclei in a dihydrogen molecule different?
- They have different nuclear spin directions (correct)
- They are antiparallel
- They are parallel
- They have different number of protons
Which type of nuclear spin does the proton of a hydrogen atom possess?
Which type of nuclear spin does the proton of a hydrogen atom possess?
What defines isotopes in chemistry?
What defines isotopes in chemistry?
What is the nuclear spin isomer called in dihydrogen where the two nuclei may be parallel or opposed?
What is the nuclear spin isomer called in dihydrogen where the two nuclei may be parallel or opposed?
Which element is the most abundant in the universe?
Which element is the most abundant in the universe?
At room temperature, dihydrogen is relatively unreactive because:
At room temperature, dihydrogen is relatively unreactive because:
Which element does hydrogen NOT form compounds with?
Which element does hydrogen NOT form compounds with?
What is the percentage of hydrogen in the Earth's crust on an atom basis?
What is the percentage of hydrogen in the Earth's crust on an atom basis?
Which property describes the angular momentum of electrons in a molecule?
Which property describes the angular momentum of electrons in a molecule?
What is the main factor determining the chemical behaviour of hydrogen isotopes?
What is the main factor determining the chemical behaviour of hydrogen isotopes?
Which isotope of hydrogen is radioactive with a half-life of 12 years?
Which isotope of hydrogen is radioactive with a half-life of 12 years?
In which physical property do deuterium and tritium show a quantitative difference compared to protium?
In which physical property do deuterium and tritium show a quantitative difference compared to protium?
What is the term for the phenomenon where rats can distinguish between D2O and H2O, preferring the latter?
What is the term for the phenomenon where rats can distinguish between D2O and H2O, preferring the latter?
Which of the following hydrogen isotopes has the highest boiling point?
Which of the following hydrogen isotopes has the highest boiling point?
What does the difference in mass between hydrogen isotopes mainly lead to?
What does the difference in mass between hydrogen isotopes mainly lead to?
