Biochemistry

The smallest basic unit of matter is the

• molecule.
• atom.
• compound.
• cell.

Which of the following is formed when an atom gains or loses electrons?

• element
• compound
• molecule
• ion

Atoms in molecules share pairs of electrons when they make

• covalent bonds.
• ionic bonds.
• hydrogen bonds.
• polymers.

What gives water many properties that are important to living things?

• temperature
• hydrogen bonds
• density
• specific heat

The positively charged particle in an atom is called the

• neutron
• ion
• proton
• electron

Which is considered neutral?

• pH of 4
• pH of 9
• pH of 14
• pH of 7

Tomato juice has a pH of 4. Determine if it's an acid, base, or neutral. 

• acid
• base
• neutral 

Household bleach has a pH of 12. Determine if it's an acid, base, or neutral.

• acid
• base
• neutral 

Isotopes are atoms of the same element that differ in their number of

• electrons
• protons
• neutrons
• buddies

If an atom has 6 protons, 7 electrons, and 8 neutrons what is the atoms charge?

• -1
• 1
• 0
• 6