Hydrogen: Occurrence and Preparation

What is the primary manner in which hydrogen is found on Earth?

Which of the following metals can react with cold water to displace hydrogen?

What is the primary byproduct of the reaction between sodium and water?

What percentage of the mass of the universe does hydrogen constitute?

During the preparation of hydrogen, why does the produced hydrogen catch fire immediately?

Occurrence of Hydrogen

Hydrogen is the most abundant element in the universe, making up about 75% of its mass.
Found in the outer atmosphere of the sun and stars.
Also found in giant planets like Jupiter and Saturn.
On Earth, it's present in relatively small amounts.
Proportion increases with altitude.
Gases from volcanoes, coal mines, and oil wells contain hydrogen.
Hydrogen is light and escapes from Earth's atmosphere into space.
On Earth, hydrogen exists primarily in combined form due to its high reactivity.
It's a key component in many compounds, like water, minerals, cellulose, starch, sugar, fats, oils, alcohols, acids, and countless other substances.
Water is a crucial compound of hydrogen.

Preparation of Hydrogen

Most hydrogen on Earth exists as compounds.
Hydrogen can be produced from these compounds using different methods.
One method is a reaction of metals with water.
Metals like sodium, potassium, and calcium can displace hydrogen from cold water.
The reactions are highly vigorous and exothermic, causing the produced hydrogen to catch fire immediately.

This quiz explores the occurrence and preparation of hydrogen, the most abundant element in the universe. It examines its presence in different celestial bodies and methods for producing hydrogen on Earth. Test your knowledge on hydrogen's properties, reactions, and importance in various compounds.