Poles and Moles
Rxns
Positively Electronegative
Lewis Structures
Nifty Nomenclature
100
The number of atoms, molecules, or particles in 1 mole. (Give the numeric value as well as the "name")
What is Avogadro's Number (6.022 x 1023)?
100
What type of reaction is below and how can you tell:
2 HCl --> H2 + Cl2
Decomposition - one compound is broken into two (or sometimes more) products.
100
Which of the following molecules has no dipole moment?
A. CO2
B. NH3
C. H2O
D. All of the above
E. None of the above
CO2
100
Give the molecular geometry and hybridization of SiH4.
Tetrahedral, sp3
100
Give the formula of Sulfur Hexaiodide
What is SI6?
200
How many grams are in a 6.980-mol sample of sodium hydroxide?
279.2 g NaOH
200
A reaction occurs between sodium carbonate and hydrochloric acid producing sodium chloride, carbon dioxide, and water. The correct set of coefficients, respectively, for the balanced reaction is:
1, 2, 2, 1, 1
1 Na2CO3 + 2 HCl --> 2 NaCl + 1 CO2 + 1 H2O
200
The electron pair in a C-F bond could be considered
A. closer to F because fluorine has a higher electronegativity than carbon.
B. closer to C because carbon has a lower electronegativity than fluorine.
A. Electronegativity is an atom's ability to attract electrons. Since F is more electronegative than C, the electron pair would be closer to F.
200
Give the molecular geometry and hybridization of XeF4
Square planar, sp3d2
BONUS: What is the ELECTRON PAIR geometry?
200
Give the formula of Ferrous Cromate
What is FeCrO4?
300
How many atoms of hydrogen are present in 4.11 g of water?
2.75 x 1023 atoms of H
300
Given the reactants: CaS + P -->
What are the products and type of reaction?
Ca3P2 + S
Single replacement reaction
300
Choose the compound with the most ionic bond. How can you tell?
A. LiCl
B. KF
C. NaCl
D. LiF
E. KCl
B. KF
F is more electronegative than Cl. K is less electronegative than Na and Li. KF would therefore have the greatest electronegativity difference and thus, the most ionic bond.
300
Which of the following molecules is nonpolar?
A. H2O
B. CO
C. NO3-
D. SiO2
D. SiO2
300
By looking at a formula, how can you tell if it is a covalent or an ionic compound if you do not have electronegativity values? (identify the rules for both)
Ionic: cation + anion / metal + nonmetal
Covalent: anion + anion / nonmetal + nonmetal
Covalent: anion + anion / nonmetal + nonmetal
400
Which of the following bonds is least ionic in character?
A. C--O
B. H--C
C. S--Cl
D. Br--Br
D. Br--Br
(The electronegativity difference is zero, so covalent character is very high)
(The electronegativity difference is zero, so covalent character is very high)
400
When the following equation is balanced, what is the sum of the coefficients?
Al2(SO4)3 + Ca(OH)2--> Al(OH)3 + CaSO4
1 Al2(SO4)3 + 3 Ca(OH)2--> 2 Al(OH)3 + 3 CaSO4
9.
400
How does electronegativity affect whether or not a molecule is polar or nonpolar?
If there is an unbalance in electronegativity differences in the molecule, there will be a polarity. Equal electronegativity differences around the molecule will cause the molecule to be nonpolar.
400
What is the molecular geometry of CH3Cl? Is it polar or nonpolar?
Tetrahedral - polar
400
Give the name of PBr5.
What is phosphorous pentabromide?
500
When phosphorus and chlorine atoms combine to form a molecule of PCl3, 6 electrons will be ________________. And why?
A. Shared equally
B. Shared unequally
C. Gained
D. Lost
E. Evenly distributed
B. Shared unequally. The Cl atoms have a higher electronegativity than the P central atom and thus be able to attract the electrons for a higher amount of time than the P atom.
500
How can you identify the reactants of a double replacement reaction? How can you determine the products?
The reactants will consist of two compounds. The products will be two new compounds in which the ions of the reactants have switched.
500
An element with an electronegativity of 0.9 bonds with an element with an electronegativity of 3.1. Which of the following phrases best describes the bond between these elements?
A. Nonpolar covalent
B. Polar covalent
C. Ionic
D. Metallic
C. Ionic
(The electronegativity difference is greater than 1.7)
(The electronegativity difference is greater than 1.7)
500
This molecule shows the smallest number of lone pairs in its Lewis structure.
A. CH3CHO
B. CO2
C. CH3Cl
D. C2H6
E. None
D. C2H6
500
Give the formula of Mercuric Peranganate / Mercury (I) Permanganate
What is Hg2(MnO4)2?