Chem 1 Unit Test 3
Which atom in the Br-F molecule has a partial positive charge (A)
(A) Br
Which atom in the C-CI bond has a partial negative charge (A)
(A) CI
Which atom in the H-F bond has a partial negative charge (A)
(A) F
Which atom in the S-H bond has a partial positive charge (A)
(A) H
Which of the following is an example of an ionic bond (A)
(A) K-F (metal and nonmetal)
Which of the following substances contains MOSTLY ionic bonding (A)
(A) LiF
Determine the number of valance electrons in XeF2 (B)
(B) 22
Determine the number of valance electrons in POCI3 (B)
(B) 32
Which of the following statements best describes electronegativity in atoms (B)
(B) Electronegativity is the attraction an elements nucleus has for the electrons in a chemical bond
Which atom in the N-H bond has a partial positive charge (B)
(B) H
Which atom in the C-N single bond has a partial negative charge (B)
(B) N
Which atom in the S-O bond has a partial negative charge (B)
(B) O
Which atom in the P-CI bond has a partial positive charge (B)
(B) P
Which is the shape of 2p orbitals (B)
(B) dumbbell
Single, double, or triple covalent bonds in a carbon atom are formed from (B)
(B) valance electrons
Based on their positions in the periodic table, which of the following bonds is the most polar (C)
(C) B-F
Which of the following compounds does NOT exhibit covalent bonding (C)
(C) CoCI2 (contains a metal and a non-metal)
write the chemical formula for copper (II) chlorite
CuCIO2
Write the chemical formula for lead (II) nitrate
Pb(NO3)2
The following statement is INCORRECT
Pi bonds are formed from the overlap of hybrid orbitals (they're formed from the overlap of p orbitals)
The reason an ionic bond forms can best be described as
the energy change for electron transfer results in a large gain in stability when the ions bond forms
In a covalent bond (C)
(C) two atoms share valance electrons and those shared electrons form the chemical bond (between a metal and a metal)
Determine the number of valance electrons in I3- (D)
(D) 22
Which of the following bonds has the least ionic character (D)
(D) B- CI
Based on their positions in the periodic table, which of the following bonds is the most polar (D)
(D) C-F
Which one of the following is the most electronegative atom (D)
(D) F
Which of the following bonds is a non-ploar covalent bond (D)
(D) F-F
What is the mass percent of C in CH3CH3
C (12.0 x2) H (1.008 x6) = 30.048% total (C = 24) 24/30.048= 0.79872204 x 100= 79.87 mass % of C
What is the mass percent of O in C3H8O2
C (12.0 x3) H (1.008 x8) O (16.0 x2) = 76.064% total (O = 32) 32/76.064= 0.42069836 x 100= 42.06 mass % of O
The compound NaBr is
ionic (bond between metal and nonmetal)
Which of the following is a polar covalent bond (C)
(C) H-CI
Which of the following is an example of a covalent bond (C)
(C) H-CI
Which of the following statements is FALSE (E)
(E) In a bond between magnesium and sulfur, the electrons will be shared and closer to the sulfur
Write the chemical formula for aluminum fluoride
AIF3
Write the chemical formula for calcium chloride
CaCI2
Write the chemical formula for sodium hydride
NaH
