HELP ASAP PLS! How many grams are present in 0.0567 mol C2H6 ?
1 answer:
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Answer:
B. BF₃
Explanation:
All the molecules have polar bonds, but a molecule will be nonpolar if the molecule has the symmetry that makes the bond dipoles cancel.
To make the decision, we must
- Draw the Lewis structure
- Assign the VSEPR electron geometry
- Determine the molecular shape.
- Examine the symmetry of the molecule
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<em>A. Water </em>
Lewis structure = H-O-H (2 bonding pairs, 2 lone pairs)
Electron geometry = AX₂E₂ tetrahedral
Molecular geometry = bent
Symmetry (see Figure A): The two O-H bonds are polar, with their negative ends pointing towards the O. The horizontal components of the bond dipoles cancel, but the vertical components reinforce each other and give an upward pointing molecular dipole. This is a <em>polar molecule with polar bonds</em>.
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<em>B. Boron trifluoride </em>
Lewis structure = BF₃ (3 bonding pairs)
Electron geometry = AX₃, trigonal planar
Molecular geometry = trigonal planar
Symmetry (see Figure B): The three B-F bonds are polar, with their negative ends pointing towards the F. The horizontal components of the bond dipoles cancel, but the vertical components of the two downward -pointing dipoles reinforce each other and give a resultant that is equal and opposite to the upward dipole. Thus, the bond dipoles cancel. This is a nonpolar molecule with polar bonds.
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<em>C. Ammonia</em>
Lewis structure = :NH₃ (3 bonding pairs, 1 lone pairs)
Electron geometry = AX₃E, tetrahedral
Molecular geometry = trigonal pyramidal
Symmetry (see Figure C): The three N-H bonds are polar, with their negative ends pointing towards the N. The horizontal components of the bond dipoles cancel, but the vertical components reinforce each other and give an upward pointing molecular dipole. This is a <em>polar molecule with polar bonds</em>.
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<em>D. Nitrogen trichloride </em>
Lewis structure = :NCl₃ (3 bonding pairs, 1 lone pair)
Electron geometry = AX₃E, tetrahedral
Molecular geometry = trigonal pyramidal
Symmetry (see Figure D): The three N-Cl bonds are polar, with their negative ends pointing towards the Cl. The horizontal components of the bond dipoles cancel, but the vertical components reinforce each other and give a downward pointing molecular dipole. This is a <em>polar molecule with polar bonds</em>.
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<em>E. Dichloromethane </em>
Lewis structure = H₂CCl₂ (4 bonding pairs)
Electron geometry = AX₄, tetrahedral
Molecular geometry = tetrahedral
Symmetry (see Figure E): The two C-H bonds are nonpolar, but the two C-Cl bonds are polar with their negative ends pointing towards the Cl. The horizontal components of the bond dipoles cancel, but the vertical components reinforce each other and give a downward pointing molecular dipole. This is a <em>polar molecule with polar bonds</em>.
Answer:
A. Erosion
Explanation:
Erosion is the process in which soil and rock are worn away and transported by wind or water and transported to another location.
The image below shows how water has eroded a coastline.
B is wrong. Chemical weathering is the disintegration of rocks by reactions with water and the acids dissolved in it
C is wrong. Deposition is the process in which sediments carried by wind, water or ice are deposited at another location.
D is wrong. Physical weathering is the breakdown of rocks and soil by physical processes like the freezing of ice in the cracks of rocks.
