5 Written questions
5 Matching questions
- Difference between covalent and ionic bonds?
- What is the atomic mass?
- Difference between an element and a compound?
- What are the two strong chemical bonds?
- What is the atomic number?
- a The number of protons and neutrons in nucleus.
- b The number of protons in an atom.
- 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 Covalent bonds are the SHARING of electrons, whether it be equally or unequally
Ionic bonds are the GAINING or LOSING of electrons, NOT SHARING
- e Covalent bonds (STRONGEST) and Ionic bonds.
5 Multiple choice questions
- Potential energy - stored energy due to location or structure; ready to use energy
Kinetic energy - energy in motion or movement; currently using
- 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
- One atom's attraction of the electrons within one covalently bonded molecule
O > N > C > H
Oxygen - most electronegative element
- Ex: O - only 6 rings on outer shell, so it wants to gain 2, making it 2- charge
- Protons - positive; in nucleus; 1 dalton (or amu)
Neutrons - neutral; in nucleus; 1 dalton (or amu)
Electrons - negative; found outside nucleus; 0 nothing
5 True/False questions
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) → Polar covalent bond.
(it's when there's more than one polar molecule that hydrogen bonding takes place)
What is an ion? → A substance that cannot be broken down to other substances by chemical reactions.
What is a chemical reaction? Be able to identify the products and reactants in a chemical reaction. → Partial plus of a Hydrogen in a polar molecule forms a bond with a Partial Minus of another polar molecule; Weak bond.
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