Lesson 3.1.3.5
3.1.3.5 Shapes of simple molecules and ions Quiz: AQA Chemistry, Unit 1
20 questions
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Lesson 3.1.3.5, Shapes of simple molecules and ions: 20 multiple choice questions for the AQA Chemistry (7405), Unit 1: Physical chemistry, written with Revision Ninja.
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The 20 questions
-
In VSEPR theory, which order of repulsion strength is correct?
- Bonding pair-bonding pair > lone pair-bonding pair > lone pair-lone pair
- All pairs repel with equal strength
- Lone pair-lone pair > lone pair-bonding pair > bonding pair-bonding pair
- Lone pair-bonding pair > lone pair-lone pair > bonding pair-bonding pair
-
What is the shape of a methane molecule, CH4?
- Square planar
- Linear
- Trigonal planar
- Tetrahedral
-
What is the bond angle in methane, CH4?
- 90
- 104.5
- 120
- 109.5
-
What is the shape of a boron trifluoride molecule, BF3?
- Tetrahedral
- Trigonal pyramidal
- Trigonal planar
- Bent
-
What is the shape of a water molecule?
- Linear
- Tetrahedral with a bond angle of 109.5 degrees
- Trigonal planar
- Bent, with a bond angle of about 104.5 degrees
-
Why is the bond angle in ammonia, NH3, less than 109.5 degrees?
- Hydrogen atoms are larger than carbon atoms
- NH3 has more bonding pairs than CH4
- Nitrogen has more protons than carbon
- The lone pair on nitrogen repels the bonding pairs more strongly, compressing the bond angles
-
Which molecule is linear?
- CO2
- CH4
- NH3
- H2O
-
What is the shape of an ammonia molecule, NH3?
- Trigonal pyramidal
- Trigonal planar
- Bent
- Tetrahedral
-
What is the shape and bond angle of an SF6 molecule?
- Octahedral, with bond angles of 90 degrees
- Hexagonal planar, with bond angles of 120 degrees
- Trigonal bipyramidal, with bond angles of 120 degrees
- Octahedral, with bond angles of 109.5 degrees
-
What shape does PCl5 have?
- Octahedral
- Tetrahedral
- Trigonal bipyramidal
- Square pyramidal
-
What is the shape of XeF4, which has four bonding pairs and two lone pairs?
- Octahedral
- Tetrahedral
- Square planar
- Seesaw
-
What is the shape of sulfur dioxide, SO2, with one lone pair on sulfur?
- Linear
- Trigonal planar with 120-degree angles
- Bent, with an angle of about 119 degrees
- Tetrahedral with 109.5-degree angles
-
Why is the bond angle in water (104.5 degrees) smaller than in methane (109.5 degrees)?
- Oxygen has a smaller atomic radius than carbon
- Two lone pairs on oxygen repel the bonding pairs more strongly than bonding pairs repel each other
- Water has only four electrons in total
- Hydrogen atoms are more electronegative than carbon
-
Which molecule has bond angles of 120 degrees?
- H2O
- CH4
- NH3
- BF3
-
What is the shape of the carbonate ion, CO3 2-?
- Linear
- Tetrahedral
- Trigonal planar
- Trigonal pyramidal
-
What is the shape of ClF3, which has three bonding pairs and two lone pairs?
- Trigonal pyramidal
- Trigonal planar
- T-shaped
- Linear
-
A central atom has two bonding pairs and two lone pairs. What is the shape?
- Tetrahedral
- Bent
- Linear
- Trigonal planar
-
What is the bond angle in the ammonium ion, NH4+?
- 107 degrees
- 90 degrees
- 104.5 degrees
- 109.5 degrees
-
What is the shape of the ICl4- ion, which has four bonding pairs and two lone pairs?
- Tetrahedral
- Square planar
- Trigonal bipyramidal
- Octahedral
-
Which statement about electron pair repulsion is correct?
- Only lone pairs affect the shape of a molecule
- Electron pairs always arrange in a straight line
- Bonding pairs repel more strongly than lone pairs
- Pairs of electrons in the outer shell arrange themselves as far apart as possible to minimise repulsion
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