5 Written Questions

1. a positively charged ion formed of a hydrogen atom that has lost its electron
2. mass of an atom equal to the number of protons plus the number of neutrons within the nucleus
3. A type of bond in which electrons are shared equally between two atoms of similar electronegativity.
4. A pure substance that cannot be broken down into other substances by chemical or physical means
5. unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure

5 Matching Questions

1. pH scale
2. atomic number
3. octet rule
4. covalent bond
5. solute

1. a number of protons within the nucleus of an atom
2. b a chemical bond that involves sharing a pair of electrons between atoms in a molecule
3. c measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14
4. d the dissolved substance in a solution
5. e States that atoms lose, gain or share electrons in order to acquire a full set of eight valence electrons

5 Multiple Choice Questions

1. substance or group of substances that tend to resist pH changes of a solution, thus stabilizing its relative acidity and basicity
   1. matter
   2. base
   3. buffer
   4. tracer
2. a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
   1. molecule
   2. solute
   3. calorie
   4. compound
3. a water molecule that lost a proton, negatively charged ion made of oxygen and hydrogen (OH-), high concentration of this ion indicates a base (OH-)
   1. hydroxide ion (OH-)
   2. hydrophilic
   3. hydrogen bond
   4. hydrogen ion (H+)
4. a particle that is electrically charged (positive or negative)
   1. atom
   2. base
   3. proton
   4. ion
5. a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion
   1. ionic bond
   2. ion
   3. solution
   4. neutron

5 True/False Questions

1. matter → that which has mass and occupies space

   True        False

2. tracer → any radioactive isotope introduced into the body to study metabolism or other biological processes

   True        False

3. hydrophilic → Having a reluctance to mix with water; usually nonpolar molecules. The fatty acids that form the interior pocket between the two layers of the cell membrane are hydrophobic.

   True        False

4. salt → molecules tending to lower the hydrogen ion concentration in a solution and raise the pH numerically

   True        False

5. neutron → a subatomic particle that has no charge and that is found in the nucleus of an atom

   True        False