QRQ 1. Organic molecules contain the element
QRQ 2. The smallest unit of any element that displays all of the chemical properties of that element is a
QRQ 3. In the subatomic structures of an atom, a has a positive charge; a has a negative charge; and an has no charge.
QRQ 4. Fill in the blanks with numbers: The first shell of an atom holds at most electrons; whereas, once the first shell is filled, the second shell holds at most electrons.
QRQ 5. Fill in the blanks with numbers: Hydrogen has protons and neutrons in its core and electrons in its outer shell.
QRQ 6. Fill in the blanks with numbers: Oxygen has protons and neutrons in its core and has electrons in its outer shell.
QRQ 7. Give the chemical symbol for each of the following:
a. chlorine
b. hydrogen
c. oxygen
d. sodium
e. sodium ion
f. table salt
g. water
QRQ 8. Select all that apply to hydrophilic molecules: dissolve substances, do not dissolve in water, examples include fats, examples include sugars and some amino acids, no uneven charge distribution, polar, tend to dissolve in water, uneven charge distribution, water-fearing, water-loving
QRQ 9. Select from the following the appropriate term for each statement below: covalent, electrostatic, hydrogen, hydrophilic, hydrophobic, molecule, nonpolar, polar, solute, solution, solvent
a. A molecule is made up of two or more atoms that are held together by chemical bonds.
b. A solvent dissolves other substances.
c. Molecules that are not charged but have an uneven charge distribution internally, so that they present somewhat negative and somewhat positive areas, are called polar.
d. The weak attraction between the hydrogen of one water molecule with the oxygen of another water molecule is called a hydrogen bond.
