Hydrogen Flashcards
What is hydrogen?
Hydrogen is the lightest and simplest element in the universe.
What is hydrogen made of?
Hydrogen is made of just one proton and one electron.
What is the symbol and atomic number of hydrogen?
Its symbol is H on the periodic table, and its atomic number is 1.
Where is hydrogen found?
Hydrogen is found everywhere; it is the most common element in the universe.
What are stars mostly made of?
Stars, including our Sun, are mostly made of hydrogen.
What does hydrogen look like?
On Earth, hydrogen is found in water (H₂O) and in many other compounds, but not often as pure hydrogen gas.
What are the characteristics of pure hydrogen gas?
Pure hydrogen gas is colorless, tasteless, and doesn’t have a smell. It’s very light, lighter than air, so it floats upward.
Why is hydrogen important?
Hydrogen is part of water, which is essential for life.
What powers stars?
Hydrogen powers stars through nuclear fusion, where hydrogen atoms combine to form helium and release energy.
How is hydrogen being developed as an energy source?
Scientists are developing hydrogen as a clean energy source. When hydrogen burns, it just makes water, not pollution.
When was hydrogen formed?
Hydrogen was the first element formed after the Big Bang, about 13.8 billion years ago.
What are some uses of hydrogen?
Hydrogen is used to make things like rocket fuel and fertilizers.
What safety note is important regarding hydrogen?
Hydrogen is highly flammable and can catch fire or explode if not handled carefully.
What happened to the Hindenburg?
The Hindenburg, a big airship, was filled with hydrogen gas and caught fire in 1937 because hydrogen is very flammable.
What role does hydrogen play in the universe?
Hydrogen is like the building block of everything, helping stars shine and life exist.
