5 Written questions
5 Matching questions
- Are Van der Waals interactions weak or strong?
- What is an element?
- What is matter?
- Difference between an element and a compound?
- What is a compound?
- a 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.
- b Anything that takes up space and has mass. Ex: Air; something that isn't matter: light (think of the filling up a balloon metaphor)
- c a substance consisting of two or more different elements combined in a fixed ratio.
- d Weak.
- e A substance that cannot be broken down to other substances by chemical reactions.
5 Multiple choice questions
- The number of protons and neutrons in nucleus.
- The sharing of electrons UNEQUALLY; atoms have differing electronegativities
- Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
- The sharing of electrons EQUALLY; atoms have similar electronegativities
- Non-polar covalent bond; they have equal electronegativity so they share their e⁻
5 True/False questions
What's a positive ion called? A negative ion? → Positive ion = CATION
Negative ion = ANION
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 covalent bonds? Single? Double? → 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 are valence electrons? → Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
What are isotopes? → Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms