5 Written questions
5 Matching questions
- Difference between covalent and ionic bonds?
- Are Van der Waals interactions weak or strong?
- What are trace elements?
- What are non-polar covalent bonds?
- What are polar covalent bonds?
- a The sharing of electrons UNEQUALLY; atoms have differing electronegativities
- b Weak.
- c Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
- d Covalent bonds are the SHARING of electrons, whether it be equally or unequally
Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
- e The sharing of electrons EQUALLY; atoms have similar electronegativities
5 Multiple choice questions
- The making and breaking of chemical bonds.
1. Reactants - structure of chemicals prior to a chemical reaction
3. Products - structure of chemicals as a result of a chemical reaction
- Atoms that lose or gain electrons to complete their outer shell
- Different forms of the same element; they differ in number of neutrons, but they have the same # of protons and behave identically in chemical reactions
- First shell - 2
Second shell - 8
Third shell - 8
- Potential energy - stored energy due to location or structure; ready to use energy
Kinetic energy - energy in motion or movement; currently using
5 True/False questions
What is the atomic mass? → The number of protons and neutrons in nucleus.
What is the atomic number? → The number of protons and neutrons in nucleus.
What bond does a SINGLE molecule of water have? (H₂O) → Polar covalent bond.
(it's when there's more than one polar molecule that hydrogen bonding takes place)
What are ionic bonds? → Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
What is a molecule? → a substance consisting of two or more different elements combined in a fixed ratio.