A neutral atom has no charge, because it has_______________

Ionic bonds are formed when:

Ions are formed when:

Fill in the blank: There are four most common chemical elements in all organisms. ___________is not one of them.

Which macromolecule stores energy, insulates us, and makes up the cell membrane

An electrolyte is an atom or molecule that_____________

Use the following figure to answer the question.  

A normal human red blood cell contains about 1% salt by weight.  “Fresh” water is nearly 100% water (with almost no salt).  You put a drop of blood into a beaker of fresh water.  Blood cells are surrounded by a semipermeable cell membrane.  Use this situation to answer the next two questions.

Molecular motion is responsible for:

A property of water that is vital to supporting life is that:____________