Unit 2 Chemistry of Life Test Review

The ____ is positively charged, whereas the ___ is negatively charged.

• 1. neutron, electron

• 1. electron, neutron

• proton, electron

• proton, neutron

A mystery solution had a pH of 4.5 on the pH scale. Which is true?

• 1. There are absolutely no hydrogen ions in that solution, which makes it more basic.

• 1. There are more hydrogen ions in that solution, which makes it more acidic.

• 1. There are more hydroxide ions in that solution, which makes it more acidic.

• 1. There are less hydrogen ions in that solution, which  makes it more neutral.

The four main types of macromolecules are:

• 1. acids, bases, enzymes, and nucleic acids.

• 1. carbohydrates, lipids, acids, and bases

• 1. nucleic acids, proteins, chemical reactions, and bases

• 1. carbohydrates, lipids, proteins, and nucleic acids.

____ are the building blocks, or monomers, that make up proteins.

• nucleic acids

• fatty acids

• amino acids

• lipids

Which type of bonds hold two or more water molecules together?

• 1. hydrogen bonds

• 1. covalent bonds

• ionic bonds

• Van der Waals

The attraction of water to something else is called

• cohesion

• adhesion

• surface tension

• van der Waals

The attraction of water to itself is called

• surface tension

• cohesion

• adhesion

• none of the above

Which two particles make up the nucleus of an atom?

• protons and electrons
• protons and neutrons
• molecules and compounds
• neutrons and electrons

How many electrons does this picture show?

• 4
• 5
• 6
• 3

How are covalent bonds formed?

• Sharing of electrons
• Transfer of electrons