5 Written Questions

1. the property of a liquid to resist penetration by objects at its interface with the air, due to cohesion between molecules of the liquid.
2. a region within which electrons orbit that corresponds to a fixed energy level at a given distance from the atomic nucleus of an atom.
3. a liquid capable of dissolving (uniformly dispersing) other substances in itself.
4. a chemical bond formed by the electrical attraction between positively and negatively charged ions.
5. a charged atom or molecule; an atom or molecule that has either an excess of electrons (and hence is negatively charged) or has lost electrons (and is positively charged).

4 Multiple Choice Questions

1. a particle composed of one or more atoms held together by chemical bonds; the smallest particle of a compound that displays all the properties of that compound.
   1. element
   2. molecule
   3. pH scale
   4. solvent
2. a subatomic particle that is found in the nuclei of atoms, bears a unit of positive charge, and has a relatively large mass, roughly equal to the mass of the neutron.
   1. solvent
   2. neutron
   3. proton
   4. Ion
3. a covalent bond with equal sharing of electrons.
   1. hydrogen bond
   2. non-polar covalent bond
   3. polar covalent bond
   4. Ionic Bond
4. a subatomic particle that is found in the nuclei of atoms, bears no charge, and has a mass approximately equal to that of a proton.
   1. Ion
   2. element
   3. neutron
   4. proton

4 True/False Questions

1. element → a substance that cannot be broken down, or converted, to a simpler substance by ordinary chemical means.

   True        False

2. hydrogen bond → a chemical bond formed by the electrical attraction between positively and negatively charged ions.

   True        False

3. polar covalent bond → a covalent bond with unequal sharing of electrons, such that one atom is relatively negative and the other is relatively positive.

   True        False

4. pH scale → a particle composed of one or more atoms held together by chemical bonds; the smallest particle of a compound that displays all the properties of that compound.

   True        False