5 Written questions
5 Matching questions
- How many electrons does it take to fill the first orbital shell? The second? The third?
- What are polar covalent bonds?
- What is a molecule?
- What is a chemical reaction? Be able to identify the products and reactants in a chemical reaction.
- What are our 6 Essential Elements?
- a CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
- b First shell - 2
Second shell - 8
Third shell - 8
- c 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
- d 2 or more atoms held together by covalent bonds
- e The sharing of electrons UNEQUALLY; atoms have differing electronegativities
5 Multiple choice questions
- Polar covalent bond.
(it's when there's more than one polar molecule that hydrogen bonding takes place)
- A compound has characteristics different from those of its elements. Table salt, for example, is sodium chloride (NaCl), a compound composed of the elements sodium (Na) and chlorine (Cl) in a 1:1 ratio. Pure sodium is a metal, and pure chlorine is a poisonous gas. When chemically combined, however, sodium and chlorine form an edible compound.
- Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.
- Positive ion = CATION
Negative ion = ANION
- Covalent bonds are the SHARING of electrons, whether it be equally or unequally
Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
5 True/False questions
What are ionic bonds? → Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
What is a hydrogen bond? Strong or weak? → Partial plus of a Hydrogen in a polar molecule forms a bond with a Partial Minus of another polar molecule; Weak bond.
What are trace elements? → A substance that cannot be broken down to other substances by chemical reactions.
Define the potential energy level of electrons and the Kinetic energy level. → Potential energy - stored energy due to location or structure; ready to use energy
Kinetic energy - energy in motion or movement; currently using
What are the two strong chemical bonds? → Atoms interacting with each other to share, take, or give electrons.