When carbon combines with oxygen it forms carbon dioxide, a gas which………….fire.
a) burns
b) extinguishes
c) both a and b
d) none of these
The element symbol for hydrogen is:
a) K
b) H
c) He
d) Hn
All of the following are isotopes of hydrogen except:
a) tritium
b) hydronium
c) protium
d) deuterium
Which of the following is the most abundant element in the universe?NTS PST (B) ---2021
a) helium
b) hydrogen
c) aluminum
d) none of these
Approximately what percent of matter in the universe is believed to consist of hydrogen?
a) 25%
b) 50%
c) 75%
d) 90%
The name for hydrogen comes from words meaning:
a) water fearing
b) water forming
c) gas
d) fire forming
