5 Written questions
5 Matching questions
- What are covalent bonds? Single? Double?
- What is a chemical bond?
- What is a hydrogen bond? Strong or weak?
- What are isotopes?
- Difference between an element and a compound?
- a Partial plus of a Hydrogen in a polar molecule forms a bond with a Partial Minus of another polar molecule; Weak bond.
- b 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.
- c Atoms interacting with each other to share, take, or give electrons.
- d Two or more atoms SHARING ELECTRONS.
Single covalent bonds - sharing of one pair of valence electrons
Double - sharing of two pairs of valence electrons
- e 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
5 Multiple choice questions
- Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
- Non-polar covalent bond; they have equal electronegativity so they share their e⁻
- Covalent bonds are the SHARING of electrons, whether it be equally or unequally
Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
- The number of protons and neutrons in nucleus.
5 True/False questions
What's a positive ion called? A negative ion? → Positive ion = CATION
Negative ion = ANION
Choose 2 elements essential to life, draw the electron configuration of each as an ion and note the charge of the ion. → Ex: O - only 6 rings on outer shell, so it wants to gain 2, making it 2- charge
What is matter? → Atoms that lose or gain electrons to complete their outer shell
What is a molecule? → 2 or more atoms held together by covalent bonds
What are non-polar covalent bonds? → The sharing of electrons UNEQUALLY; atoms have differing electronegativities