5 Written questions
5 Matching questions
- What are valence electrons?
- What are non-polar covalent bonds?
- Difference between an element and a compound?
- What is a compound?
- What are our 6 Essential Elements?
- a a substance consisting of two or more different elements combined in a fixed ratio.
- b CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur
- c 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.
- d The electrons on the outermost orbital shell
- e The sharing of electrons EQUALLY; atoms have similar electronegativities
5 Multiple choice questions
- Two or more atoms SHARING ELECTRONS.
Single covalent bonds - sharing of one pair of valence electrons
Double - sharing of two pairs of valence electrons
- Non-polar covalent bond; they have equal electronegativity so they share their e⁻
- Potential energy - stored energy due to location or structure; ready to use energy
Kinetic energy - energy in motion or movement; currently using
- First shell - 2
Second shell - 8
Third shell - 8
- Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
5 True/False questions
What are ionic bonds? → Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
Difference between compound and molecule? → Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.
What's a positive ion called? A negative ion? → Positive ion = CATION
Negative ion = ANION
What bond does a SINGLE molecule of water have? (H₂O) → Non-polar covalent bond; they have equal electronegativity so they share their e⁻
Are Van der Waals interactions weak or strong? → The electrons on the outermost orbital shell