If a neutron is added to the nucleus of an atom, a different element is formed.

Sodium and Chlorine create a covalent bond to form table salt (NaCl).

The building blocks of nucleic acids are nucleotides. 

Which step occurs first?

Which of the following is the main type of molecule found in cell membranes?

Surface tension of water is caused by nonpolar covalent bonding between water molecules.

How is the chemical structure of water related to its physical properties?

Referring to the periodic table below, find potassium (element abbreviated as K). What is potassium’s charge when it becomes an ion?

Even if you quit smoking, the damage to your lungs is already done and they will not return to normal.

Muscle contraction is required for expiration.