It’s C I think and I’m not sure
To test for hydrogen, burn a candle near the suspected source of hydrogen. If you hear a squeaky pop sound, hydrogen is present because when hydrogen gas burns, it makes a squeaky pop sound.
The answer is B- Low reactivity.
Answer: A. iron: atomic number 26, mass 56, neutrons 30
Explanation:
Atomic number = proton = 26
Mass number = 56
Mass number = proton + Neutron
56 = 26 + Neutron
Neutron = 56 - 26
Neutron = 30
A chemical change because it is caused out of a chemical reaction
