5 Written questions
5 Matching questions
- What is the atomic number?
- What are trace elements?
- What are our 6 Essential Elements?
- What is a chemical reaction? Be able to identify the products and reactants in a chemical reaction.
- What are valence electrons?
- a 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
- b The electrons on the outermost orbital shell
- c CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
- d The number of protons in an atom.
- e Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
5 Multiple choice questions
- No! Example: NH₃ (ammonia) is a hydrogen bond, the partial negative of Nitrogen bonds with the partial positive of Hydrogen.
- 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.
- Ex: O - only 6 rings on outer shell, so it wants to gain 2, making it 2- charge
- Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
- Polar covalent bond.
(it's when there's more than one polar molecule that hydrogen bonding takes place)
5 True/False questions
What is the atomic mass? → The number of protons and neutrons in nucleus.
What is a hydrogen bond? Strong or weak? → Two or more atoms SHARING ELECTRONS.
Single covalent bonds - sharing of one pair of valence electrons
Double - sharing of two pairs of valence electrons
What is an element? → Atoms that lose or gain electrons to complete their outer shell
Difference between covalent and ionic bonds? → Covalent bonds are the SHARING of electrons, whether it be equally or unequally
Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
What are isotopes? → Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms