7 Written Questions

1. the smallest particle of an element that has the characteristics of that element, it is called the building block of matter
2. a force that holds together atoms that share electrons, between most compounds and between two non-metals
3. a weak bond formed by the attraction of opposite charges between hydrogen and oxygen
4. a substance that forms hydrogen ions in water; has a pH of less than 7
5. a mixture in which one or more substances (solutes) are distributed evenly in another substance (solvent); the solvent dissolves the solute
6. the bond between two ions of opposite charge, it occurs when one atom loses an electron and becomes positive and another atom gains an electron and becomes negative and the two atoms bond
7. a substance that can't be broken down into simpler chemical substances

6 Multiple Choice Questions

1. all of the chemical reactions that occur within an organism; chemical reactions occur when bonds are formed or broken
   1. molecule
   2. atom
   3. metabolism
   4. acid
2. a charged particle made of atoms
   1. atom
   2. base
   3. ion
   4. pH
3. a substance that forms hydroxide ions in water; has a pH of more than 7
   1. pH
   2. base
   3. atom
   4. ion
4. a molecule with unequal distribution of charge, it has a positive and negative end; polar water molecules attract ions and polar molecules and dissolve them
   1. nucleus
   2. polar molecule
   3. molecule
   4. mixture
5. atoms of the same element with the same number of protons but different numbers of neutrons, they are radioactive and help in medicine
   1. atom
   2. ion
   3. isotopes
   4. mixture
6. a combination of substances in which the individual components retain their own properties; the components don't combine chemically
   1. isotopes
   2. ion
   3. molecule
   4. mixture

6 True/False Questions

1. pH → a measure of how acidic or basic a solution is; the scale ranges from below 0 to above 14

   True        False

2. nucleus → the center of an atom including positive protons and neutral neutrons; they are positively charged

   True        False

3. dynamic equilibrium → condition in which there is continuous movement but no overall concentration change; materials move into and out of the cell at equal rates

   True        False

4. compound → a group of atoms held together by covalent bonds with no overall charge

   True        False

5. molecule → a group of atoms held together by covalent bonds with no overall charge

   True        False

6. diffusion → a mixture in which one or more substances (solutes) are distributed evenly in another substance (solvent); the solvent dissolves the solute

   True        False