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Chemistry A- Unit 4 Exam
93.33% ----- 14 out of 15
Terms in this set (15)
What types of molecular models show the 3D arrangement of atoms in molecules?
Select all that apply.
Magnesium has two valence electrons and oxygen has six valence electrons. The electronegativity difference between the two elements is 2.13.
How can the octet rule be used to explain the bonding between magnesium and oxygen?
Oxygen needs access to two electrons to satisfy the octet rule. Magnesium prefers to lose two valence electrons to satisfy the octet rule. Oxygen can remove two electrons from magnesium, forming ions; leading to an ionic bond.
Examine the image.
Which statement is true?
The beaker contains an ionic solution because as a solution, an ionic compound can conduct electrical current and light the bulb.
Examine the molecular geometry models.
What molecular shape has two electron groups where all the groups are shared by the central atom?
ii, because the lack of lone electron pairs means atoms will have equal repulsion forces on each other and align in a linear shape
Using the VSPER theory, what is the shape of CH2Cl2?
tetrahedral: there are four shared pairs of electrons and no lone electron pairs in the molecule
What theory describes how the valence orbitals of different atoms overlap to create a covalent bond?
valence bond theory
How are sp3 hybrid orbitals arranged around a nucleus?
four orbitals in a tetrahedral shape
What is the three-dimensional structure of the nuclei of atoms in a molecule or polyatomic ion called?
Examine the Lewis structure.
Using the Lewis structure, predict the molecular geometry of NH3.
XXX Molecule with 3 bond angles at 120 degrees.
What is the molecular geometry of the molecule methane (CH4)?
Based on the VSEPR theory, what molecular shape can be predicted if a molecule has two bonding electron pairs and one lone electron pair around the central atom?
What could cause the bond angles to differ between molecules?
the number of lone pairs of electrons on the central atom
Examine the molecules.
What do all three molecules have in common?
All of the molecules are polar covalent compounds.
If hydrogen (H) has an electronegativity of 2.20 and chlorine has an electronegativity of 3.16, what type of bond would hydrogen and chlorine form? Why?
a polar covalent bond because there is a difference in electronegativity of 0.96 between the atoms
Examine the list of compounds and the table of electronegativity values.
How does the boiling point of HBr compare to that of KBr?
HBr's boiling point is lower.
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