Unit 4 Test Review
Identify the following as covalent or ionic. water (H2O) salt (NaCl) iron (II) sulfide (FeS) calcium bromide (CaBr2) covalent ionic
CS2 BaI2 N2O4 PCl3 covalent ionic Identify the following as covalent or ionic. CS2 BaI2 N2O4 PCl3 covalent ionic
Identify the following as covalent or ionic. compound is a gas at room temperature compound, when melted, conducts an electric current compound is composed of a metal and a nonmetal compound is composed of a nonmetal and a nonmetal
What is a polyatomic ion? An ion that contains more than 1 element
What is meant by binary ionic? 2 elements (metal and nonmetal) joined by ionic bonds
What is meant by binary molecular? 2 elements (both nonmetals) joined by covalent bonds
What is meant by ternary ionic? 3 elements (metal and nonmetals) joined by ionic bonds
What part of the atom is involved in chemical reactions? Valence electrons
Why do atoms share electrons? To gain the electron configuration of a noble gas
Which intermolecular attractive force is the strongest? Hydrogen bonds
Why is carbon special? it has four electrons in its outermost energy level it readily bonds with other carbon atoms it can form single, double, or triple bonds with other atoms
What is the Octet Rule? in chemical compounds, atoms tend to have the electron configuration of a noble gas
What is the electron configuration of the sulfide ion (S-2)? 1s22s22p63s23p6
A compound that ends in -ate or -ite contains ____. A polyatomic ion
How many valence electrons are transferred from the aluminum atom to oxygen in the formation of the compound aluminum oxide? 3
Why are metal good electrical conductors? They have mobile electrons
Which elements can form diatomic molecules joined by a single covalent bond? halogens and hydrogen
Which elements can form diatomic molecules joined by double covalent bonds? oxygen
Which elements can form diatomic molecules joined by triple covalent bonds? nitrogen
What is VESPR Theory? molecules adjust their shapes to keep valence electrons as far apart as possible
What is a polar molecule? A molecule that has partial positive and negative charges
Which of the following covalent bonds is the most polar? a. H—F b. H—C c. H—H d. H—N
What is the charge on the cation in the ionic compound magnesium chloride? +2
What is the net charge of the ionic compound potassium fluoride?
What is the formula unit of calcium nitride? Ca3N2
What is the formula for potassium sulfate K2SO4
What is the formula unit for sodium sulfide? Na2S
What is the name of the following compound? NaClO2 Sodium chlorite
Are the following pairs of elements likely to form ionic or covalent compounds? phosphorus and sulfur magnesium and oxygen aluminum and chlorine
What are some properties of ionic compounds? High melting points Metal and nonmetal Conducts electricity in solution solid
What is a cation? An ion with a positive charge due to loss of electrons The metal part of an ionic compound
What is an anion? An ion with a negative charge due to gain of electrons The nonmetal part of an ionic compound
Will group 6A elements gain or lose electrons when forming ions Will group 6A elements gain or lose electrons when forming ions? How many electrons will be gained or lost? gain 2
What is the purpose of a Roman numeral following the name of an element? To indicate the presence of a transition metal that can have more than one common ionic charge.
What ion will sulfur form? sulfide
What is the formula for iron (III) oxide? Fe2O3
What is the formula for phosphorus tetrachloride? PCl4
What is the formula for trisulfur dioxide? S3O2
Reactions between atoms involve which part of the atom? Valence electrons
What is the name of the following compound? CrF3 Chromium (III) fluoride