Hydrogen: Chemical Element and Properties

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Listen to an AI-generated conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

What is the most abundant chemical substance in the universe?

  • Nitrogen
  • Oxygen
  • Hydrogen (correct)
  • Carbon

At standard conditions, in what state is hydrogen?

  • Plasma
  • Liquid
  • Solid
  • Gas (correct)

How many protons, electrons, and neutrons does the most common isotope of hydrogen (symbol 1H) have?

  • 2 protons, 2 electrons, 0 neutrons
  • 1 proton, 2 electrons, 0 neutrons
  • 1 proton, 1 electron, 0 neutrons (correct)
  • 1 proton, 1 electron, 1 neutron

Under what conditions does hydrogen become metallic?

<p>Extremely high pressures (A)</p>
Signup and view all the answers

What role does hydrogen play in acid–base reactions?

<p>It exchanges protons (C)</p>
Signup and view all the answers

What is the enthalpy of combustion for hydrogen gas?

<p>-286 kJ/mol (B)</p>
Signup and view all the answers

What is the autoignition temperature of hydrogen gas in air?

<p>500 °C (D)</p>
Signup and view all the answers

What does the symbol H+ represent in ionic compounds?

<p>Proton cation (D)</p>
Signup and view all the answers

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

<p>Ultraviolet light (B)</p>
Signup and view all the answers

How was hydrogen gas first artificially produced in the early 16th century?

<p>By the reaction of acids on metals (D)</p>
Signup and view all the answers

Flashcards

Most abundant element

The most abundant chemical substance in the universe.

State of hydrogen

A gas.

Hydrogen-1 composition

1 proton, 1 electron, and 0 neutrons.

Metallic hydrogen

Extremely high pressures.

Signup and view all the flashcards

Hydrogen in acid-base reactions

Hydrogen exchanges protons.

Signup and view all the flashcards

Hydrogen's enthalpy of combustion

-286 kJ/mol

Signup and view all the flashcards

Hydrogen autoignition temperature

500 °C

Signup and view all the flashcards

H+ meaning

Proton cation

Signup and view all the flashcards

Hydrogen-oxygen flames

Ultraviolet light.

Signup and view all the flashcards

Early hydrogen production

By the reaction of acids on metals.

Signup and view all the flashcards

Study Notes

Hydrogen Facts

  • Hydrogen is the most abundant chemical substance in the universe.

Physical Properties of Hydrogen

  • At standard conditions, hydrogen is in a gaseous state.

Atomic Structure of Hydrogen

  • The most common isotope of hydrogen (symbol 1H) has:
    • 1 proton
    • 1 electron
    • 0 neutrons

Metallic Hydrogen

  • Hydrogen becomes metallic under extremely high pressures, typically above 100 GPa.

Acid-Base Reactions

  • Hydrogen plays a crucial role in acid-base reactions.

Combustion Properties of Hydrogen

  • The enthalpy of combustion for hydrogen gas is -286 kJ/mol.
  • The autoignition temperature of hydrogen gas in air is 500°C.

Ionic Compounds

  • The symbol H+ represents a hydrogen ion in ionic compounds.

Hydrogen Flames

  • Pure hydrogen-oxygen flames emit ultraviolet light, making them invisible.

History of Hydrogen Production

  • Hydrogen gas was first artificially produced in the early 16th century through the reaction of acids with metals.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Like This

Use Quizgecko on...
Open
Browser
Browser