Hydrogen

15 Points Per Correct Answer - No time limit  

1. 'Hydrogen' means: heat making water forming sun fuel lightest

2. When was hydrogen recognized as a distinct substance? 1812 1766 1492 1933

3. Hydrogen's isotopes are the only ones that have distinct names. Which of the following is NOT an isotope of hydrogen? Tritium Protium Dilithium Deuterium

4. How much of the mass of the observable universe is made of hydrogen? 75 percent 25 percent 50 percent 90 percent

5. A cubic foot of hydrogen in a balloon will lift about how much weight? 1 ounce 1 kilogram 1 pound 1 gram