5 Written questions
5 Matching questions
- What are the two strong chemical bonds?
- What are trace elements?
- What is an element?
- What is a compound?
- Choose 2 elements essential to life, draw the electron configuration of each as an ion and note the charge of the ion.
- a Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
- b Ex: O - only 6 rings on outer shell, so it wants to gain 2, making it 2- charge
- c Covalent bonds (STRONGEST) and Ionic bonds.
- d A substance that cannot be broken down to other substances by chemical reactions.
- e a substance consisting of two or more different elements combined in a fixed ratio.
5 Multiple choice questions
- 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.
- Atoms interacting with each other to share, take, or give electrons.
- 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
- Non-polar covalent bond; they have equal electronegativity so they share their e⁻
- The electrons on the outermost orbital shell
5 True/False questions
What bond does a SINGLE molecule of water have? (H₂O) → Polar covalent bond.
(it's when there's more than one polar molecule that hydrogen bonding takes place)
Difference between compound and molecule? → Covalent bonds are the SHARING of electrons, whether it be equally or unequally
Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
Do Hydrogen Bonds only occur with water molecules? → No! Example: NH₃ (ammonia) is a hydrogen bond, the partial negative of Nitrogen bonds with the partial positive of Hydrogen.
Define Subatomic particles, their charges, where they're found, and their relative mass. → Protons - positive; in nucleus; 1 dalton (or amu)
Neutrons - neutral; in nucleus; 1 dalton (or amu)
Electrons - negative; found outside nucleus; 0 nothing
What are our 6 Essential Elements? → CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur