Bio Chapter 2 (Part A)

What is the most common element in your body?

Oxygen

A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?

The cohesion of water molecules to each other

Select the most complete explanation of what the pH scale measures.

The concentration of hydrogen ions in a solution

The blood contains chemicals called _____ that maintain a stable pH.

buffers

Individual water molecules are held to one another by relatively weak ________ bonds.

hydrogen

In an atom, the number of neutrons determines most specifically the ________.

isotope

During a chemical reaction, atoms are ________.

rearranged

Which number represents the atomic weight of oxygen?

16

The chemical name for table salt is sodium chloride, or simply NaCl. What type of chemical is NaCl?

Compound

The bond in which bonded atoms share electrons is called a(n) ________.

covalent bond