Unit 2.1 Review (Chemistry, Water, Enzymes)

Front

What is a covalent bond?

Back

A covalent bond is a type of chemical bond where atoms are bound by shared electrons.

Front

Which molecules are considered compounds?

Back

Compounds are substances formed when two or more different elements are chemically bonded. Examples include CO₂ (carbon dioxide) and H₂O (water).

Front

What is the attraction between oxygen and hydrogen atoms in water molecules?

Back

Oxygen atoms in water molecules are attracted to hydrogen atoms in other water molecules, leading to hydrogen bonding.

Front

What does a pH of 8 indicate about a solution?

Back

A pH of 8 indicates that the solution is a weak base.

Front

How do the energy levels of reactants compare to products in a chemical reaction?

Back

In many reactions, the bonds of the reactants contain more energy than the bonds of the products.

Front

What is the definition of a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the significance of hydrogen bonds in water?

Back

Hydrogen bonds are responsible for many of water's unique properties, including its high surface tension and boiling point.

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond involves the transfer of electrons from one atom to another, while a covalent bond involves the sharing of electrons.

Front

What is the role of enzymes in chemical reactions?

Back

Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required.

Front

What is the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (strongly acidic) to 14 (strongly basic), with 7 being neutral.