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.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.