Bio 101 Ch. 2

5 Written Questions

1. core of an atom; occupied by protons and neutrons
2. a dissolved substance
3. forms of an element that differ in the number of neutrons their atoms carry.
4. total number of protons and neutrons in the nucleus of an element's atoms
5. substance that releases hydrogen ions in water

5 Matching Questions

1. Charge
2. radioactive decay
3. hydrogen bond
4. salt
5. ionic bond

1. a compound that releases ions other than H+ and OH- when it dissolves in water
2. b process by which atoms of a radioisotope emit energy and/or subatomic particles when their nucleus spontaneously disintegrates
3. c type of chemical bond in which a strong mutual attraction forms between ions of opposite charge
4. d Electrical property. Opposite charges attract, and like charges repel.
5. e attraction that forms between a covalently bonded hydrogen atom and another atom taking part in a separate covalent bond

5 Multiple Choice Questions

1. liquid that can dissolve other substances
   1. solvent
   2. salt
   3. Element
   4. solute
2. transition of a liquid to a gas
   1. temperature
   2. cohesion
   3. evaporation
   4. proton
3. Number of protons in the atomic nucleus; determines the element
   1. Atom
   2. Atomic number
   3. ionic bond
   4. Mass number
4. tendency of molecules to resist separating from one another
   1. proton
   2. cohesion
   3. polarity
   4. Electron
5. positively charged subatomic particle that occurs in the nucleus of all atoms
   1. Atom
   2. Neutron
   3. Tracer
   4. proton

5 True/False Questions

1. Element → liquid that can dissolve other substances

   True        False

2. Concentration → the number of molecules or ions per unit volume of a solution

   True        False

3. pH → Particle that is a fundamental building block of all matter

   True        False

4. Buffer → a molecule labeled with a detectable substance

   True        False

5. hydrophobic → describes a substance that resists dissolving in water

   True        False