Podcast
Questions and Answers
Which of the statements concerning chemical bonds is false?
Which of the statements concerning chemical bonds is false?
- The sharing of electrons between two nonmetal atoms results in a covalent bond.
- The attraction between oppositely charged ions results in an ionic bond.
- A bond dipole is the separation of charge that results when atoms sharing electrons have different electronegativities.
- The term nonpolar is used to describe a covalent bond in which electrons are not shared equally. (correct)
What is the Lewis structure for chloroethylene (C2H3Cl)?
What is the Lewis structure for chloroethylene (C2H3Cl)?
H H H-C=C-Cl
What is the molecular shape around the phosphorus atom in PH3?
What is the molecular shape around the phosphorus atom in PH3?
- Bent
- Trigonal planar
- Trigonal pyramidal
- Tetrahedral (correct)
- Linear (correct)
Which of the following molecule(s) is(are) polar?
Which of the following molecule(s) is(are) polar?
Which is the correct Lewis structure for OBr-?
Which is the correct Lewis structure for OBr-?
Which bond is the MOST polar?
Which bond is the MOST polar?
What is the molecular shape around the nitrogen atom in the structure shown below? S-H H-C-O-H H-N=C-H
What is the molecular shape around the nitrogen atom in the structure shown below? S-H H-C-O-H H-N=C-H
What is the molecular shape around the oxygen atom in the structure shown below? S-H H-C-O-H H-N=C-H
What is the molecular shape around the oxygen atom in the structure shown below? S-H H-C-O-H H-N=C-H
Which molecule's Lewis structure contains an atom that violates the octet rule?
Which molecule's Lewis structure contains an atom that violates the octet rule?
Which compound has the greatest number of valence electrons?
Which compound has the greatest number of valence electrons?
Which Lewis structure is incorrect?
Which Lewis structure is incorrect?
The Lewis structure shown below is not a valid Lewis structure. What statement best describes the error in the structure? Cl-N=N-Cl Cl Cl
The Lewis structure shown below is not a valid Lewis structure. What statement best describes the error in the structure? Cl-N=N-Cl Cl Cl
Considering the electronegativity values indicated for each element, which covalent bond has the LEAST degree of polarity?
Considering the electronegativity values indicated for each element, which covalent bond has the LEAST degree of polarity?
The Lewis structure of formaldehyde is shown below. Which statement concerning this structure is INCORRECT? O H-C-H
The Lewis structure of formaldehyde is shown below. Which statement concerning this structure is INCORRECT? O H-C-H
Which statement concerning the ion Li+ is correct?
Which statement concerning the ion Li+ is correct?
What is the electron configuration of an F- ion?
What is the electron configuration of an F- ion?
What is the ion symbol for an atom with twenty (20) protons and eighteen (18) electrons?
What is the ion symbol for an atom with twenty (20) protons and eighteen (18) electrons?
What is the ion symbol for an atom with sixteen (16) protons and eighteen (18) electrons?
What is the ion symbol for an atom with sixteen (16) protons and eighteen (18) electrons?
How many protons and electrons are present in Co2+?
How many protons and electrons are present in Co2+?
What is the formula for the ionic compound lithium oxide?
What is the formula for the ionic compound lithium oxide?
Which statement best explains the basis for the octet rule?
Which statement best explains the basis for the octet rule?
What is the formula for the ionic compound formed when aluminum and sulfur combine?
What is the formula for the ionic compound formed when aluminum and sulfur combine?
What is the chemical formula of tin (IV) cyanide?
What is the chemical formula of tin (IV) cyanide?
The formula for zinc acetate is ________.
The formula for zinc acetate is ________.
Which chemical formula is NOT correct?
Which chemical formula is NOT correct?
Which chemical formula is correct?
Which chemical formula is correct?
What is the name of the compound (NH4)2SO4?
What is the name of the compound (NH4)2SO4?
Which compound has the highest melting point?
Which compound has the highest melting point?
What is the charge on the chromium ion in the ionic compound CrCl3?
What is the charge on the chromium ion in the ionic compound CrCl3?
What is the formula for the ionic compound formed from the lead (II) ion and the carbonate ion?
What is the formula for the ionic compound formed from the lead (II) ion and the carbonate ion?
What is the formula for chromous cyanide?
What is the formula for chromous cyanide?
The diphosphate ion is a biologically important polyatomic ion. If the ionic compound calcium diphosphate has the formula Ca2P2O7, which correctly represents the ion symbol of the diphosphate ion?
The diphosphate ion is a biologically important polyatomic ion. If the ionic compound calcium diphosphate has the formula Ca2P2O7, which correctly represents the ion symbol of the diphosphate ion?
The correct name for AuI3 is ________.
The correct name for AuI3 is ________.
The correct name for Ag2O is ________.
The correct name for Ag2O is ________.
Study Notes
Chemical Bonds
- Atoms with five valence electrons generally form three covalent bonds.
- The sharing of electrons between nonmetals results in covalent bonds while the attraction between oppositely charged ions results in ionic bonds.
- Nonpolar covalent bonds are characterized by equal sharing of electrons, and a bond dipole occurs when atoms have differing electronegativities.
Molecular Structures and Geometry
- Formaldehyde (CH2O) has 12 valence electrons.
- Chloroethylene (C2H3Cl) can be represented with the Lewis structure H-C=C-Cl.
- Carbonic acid has bond angles around the carbon atom of 120° due to its trigonal planar geometry.
- Aspartic acid requires 4 lone pairs of electrons to complete its structure.
Molecular Shapes
- The molecular shape around a phosphorus atom in PH3 is trigonal pyramidal.
- The nitrogen atom in NH3 exhibits a trigonal pyramidal shape.
- The bond angles around sulfur in certain organic compounds measure approximately 109.5°.
Polarity in Molecules
- Molecules CBr3 and others may be polar based on their structure and electronegativity values.
- The most polar bond among given options is C-F, due to the significant difference in electronegativity.
Lewis Structures
- Valid Lewis structures respect the octet rule, while incorrect structures may violate this principle.
- The Lewis structure of OBr- includes a charge indicating additional electrons.
Valence Electrons and Electron Configuration
- Lithium ions (Li+) have 2 total electrons, and fluorine ions (F-) have a configuration of 1s² 2s² 2p⁶.
- An atom with 20 protons and 18 electrons is denoted as Ca²⁺, while an atom with 16 protons and 18 electrons is represented as S²⁻.
Ionic Compounds
- The ionic compound lithium oxide is represented by the formula Li2O.
- When aluminum and sulfur combine, the formula is Al2S3.
- Sn(CN)4 represents tin (IV) cyanide.
Chemical Naming and Formula Accuracy
- (NH4)2SO4 is named ammonium sulfate.
- AuI3 is classified as gold (III) iodide, while Ag2O is known as silver (I) oxide.
- The charge on the chromium ion in CrCl3 is +3.
Melting Points and Ionic Compounds
- KCl has a higher melting point compared to other organic or molecular substances listed, due to strong ionic bonds.
- The formula for the ionic compound containing lead (II) and carbonate ions is PbCO3.
Polyatomic Ions
- Calcium diphosphate is represented as Ca2P2O7, indicating the diphosphate ion as P2O7²⁻.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Prepare for your upcoming Chemistry exam with this interactive flashcard review covering Chapters 3 and 4. Test your understanding of covalent bonds and the characteristics of chemical bonding with multiple-choice questions.
