Ch 2. Chemistry of Living Things

Front

Covalent compounds form when atoms

Back

share electrons.

Front

The attraction of one water molecule for another is known as

Back

cohesion.

Front

Water reacts with many substances because it is a nonpolar molecule.

Back

False. Water is a polar molecule.

Front

Lipids include

Back

fats.

Front

Which graphs show exothermic reactions?

Back

1, 2, & 3.

Front

What is the definition of a covalent bond?

Back

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

Front

What is polarity in molecules?

Back

Polarity refers to the distribution of electrical charge over the atoms joined by the bond.

Front

What are the main types of macromolecules?

Back

Carbohydrates, lipids, proteins, and nucleic acids.

Front

What is the role of enzymes in biological reactions?

Back

Enzymes act as catalysts to speed up chemical reactions in the body.

Front

What is the difference between adhesion and cohesion?

Back

Adhesion is the attraction between different substances, while cohesion is the attraction between similar substances.