5 Written Questions
5 Matching Questions
- Do Hydrogen Bonds only occur with water molecules?
- Define the potential energy level of electrons and the Kinetic energy level.
- What is a molecule?
- What bond do two oxygen's share?
- What are trace elements?
- a No! Example: NH₃ (ammonia) is a hydrogen bond, the partial negative of Nitrogen bonds with the partial positive of Hydrogen.
- b Non-polar covalent bond; they have equal electronegativity so they share their e⁻
- c Potential energy - stored energy due to location or structure; ready to use energy
Kinetic energy - energy in motion or movement; currently using
- d 2 or more atoms held together by covalent bonds
- e Elements required by organisms in minute quantities; ex: humans need iodine in small quantities or we'll get goiter
5 Multiple Choice Questions
- The sharing of electrons EQUALLY; atoms have similar electronegativities
- Polar covalent bond.
(it's when there's more than one polar molecule that hydrogen bonding takes place)
- Electron gaining or losing; e⁻ TRANSFER (NOT SHARING) between two atoms
- Protons - positive; in nucleus; 1 dalton (or amu)
Neutrons - neutral; in nucleus; 1 dalton (or amu)
Electrons - negative; found outside nucleus; 0 nothing
- Two or more atoms SHARING ELECTRONS.
Single covalent bonds - sharing of one pair of valence electrons
Double - sharing of two pairs of valence electrons
5 True/False Questions
What is a compound? → 2 or more atoms held together by covalent bonds
Difference between covalent and ionic bonds? → Compound is a mixture of at least two different elements, while a molecule is a 2 or more atoms of a single element.
Difference between an element and a compound? → 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? → 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
What is the atomic number? → The number of protons and neutrons in nucleus.