2.2.4 quiz: the periodic table
question 3 of 10
2. points
how is hydrogen in heavy water different from hydrogen in normal water?
a. the hydrogen atoms in heavy water have a neutron in the nucleus,
doubling the mass.
b. the hydrogen atoms in heavy water have an extra proton in the
nucleus.
o
c. the hydrogen in heavy water is radioactive.
o
d. the heavy water molecules contain 3 hydrogen atoms instead of

Explanation:

Heavy water (deuterium oxide, 2

H

2O, D

2O) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2

H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1

H or H, also called protium) that makes up most of the hydrogen in normal water.[4] The presence of deuterium gives the water different nuclear properties, and the increase of mass gives it slightly different physical and chemical properties when compared to normal water. It can be used to create ice and snow at higher temperatures since its melting point is 3.82 C.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.