Life's Chemical Basis

Temperature

measure of molecular motion

Negative charge

more electrons than protons

Positive charge

more protons than electrons

Rank the following chemical bonds in order of increasing polarity: non polar covalent ionic polar covalent

non polar covalent polar covalent ionic

Atomic number

number of protons in nucleus

Atoms share electrons unequally in a(n) ____ bond.

polar covalent

Hydrophilic

polar, dissolves easily in water

All ions have at least one

proton

Hydrogen ions (H+) are ____

- in blood - protons - indicated by a pH scale

A salt does not release ____ in water

H+

When dissolved in water, a(n) _____ donates H+; a(n) _____ accepts H+.

acid, base

In the periodic table, the elements are arranged according to

atomic number

A ____ can help keep the pH of a solution stable.

buffer

Hydrogen bonds

collectively strong

The measure of an atom's ability to pull electrons away from another atom is called

electronegativity

What atom has only one proton?

hydrogen

pH

hydrogen ion concentration

A(n) ____ substance repels water.

hydrophobic

The mutual attraction of opposite charges holds atoms together as molecules in an _______ bond.

ionic

A ____ is disolved in a solvent.

solute

A molecule into which a radioisotope has been incorporated can be used as a ____

tracer

Hydrophobic

water hating