Answer to Question 1
Water molecules are polar and are strongly attracted to one another. When pure water is brought to a boil it bubbles but does not boil over. However, when pasta is added it begins to break down, disrupting the interaction between water molecules. As a result, the surface of each of the bubbles in the boiling water expands, causing the water to flow out of the pot. However, oil is nonpolar and does not mix well with water. When oil is added to the water beforehand it forms droplets at the surface that act as bubble breakers.
Answer to Question 2
Antacids are medicines that neutralize stomach acid. Although there are a variety of antacids on the market, they commonly contain one or more of the following active ingredients: aluminum hydroxide, calcium carbonate, magnesium hydroxide, and sodium bicarbonate. The alkaline ingredient in the antacid reacts with the acid in the stomach and produces salt and water. Thus, the stomach acid is neutralized.
Water-conducting cells of the xylem.
Water striders serve as a model organism for the study of sexual conflict between males and females.
Water in a can
Layers of Rock Laid Down by Water
Irrigation Technology Can Conserve Water
The Distribution of Water on Earth