Answer all the questions below then hit the check answers button and scroll down to see your score.
1. In the VSEPR model, what mainly determines the basic shape of a molecule?
2. A molecule with two electron pairs around the central atom and no lone pairs has which basic shape?
3. A molecule with three electron pairs around the central atom and no lone pairs has which basic shape?
4. The basic shape associated with four electron pairs around the central atom and bond angles of 109.5° is .
5. What is the ideal H–C–H bond angle in methane, CH4, which has a perfect tetrahedral shape?
6. According to the VSEPR model, electron pairs arrange themselves as far apart as possible in 3D space to minimise between them.
7. Which statement correctly describes the relative repulsions between electron pairs?
8. In an ammonia molecule, NH3, how many electron pairs (bonding + lone) surround the nitrogen atom?
9. How many lone pairs of electrons are present on the oxygen atom in a water molecule, H2O?
10. The basic electron-pair geometry for a molecule with five regions of electron density around the central atom is:
11. A molecule with six bonding pairs around the central atom and no lone pairs has which basic shape?
12. In a trigonal bipyramidal molecule, the three positions around the middle of the molecule are called the positions.
13. In the same trigonal bipyramidal molecule, the two positions at 90° to the equatorial atoms are called the positions.
14. Which bond angles are present in an ideal octahedral molecule such as SF6?
15. In a simple linear molecule such as BeCl2, the Cl–Be–Cl bond angle is degrees.
