Shapes Of Molecules

State the principle of electron-pair repulsion theory.

Which sequence correctly ranks repulsion strength from greatest to least?

The H–N–H bond angle in NH₃ is 107°, whereas the H–C–H bond angle in CH₄ is 109.5°. Which statement explains this difference?

Carbon dioxide, CO₂, contains two C=O double bonds. Which shape and bond angle does CO₂ adopt?

Phosphorus pentachloride in the gas phase, PCl₅(g), is trigonal bipyramidal. Which pair of bond angles is present in this molecule?

Determine the shape and bond angle of the hydronium ion, H₃O⁺.

Which species has the same shape and bond angle as CH₄?

Predict the shape of XeF₄, in which Xe has four bonding pairs and two lone pairs.

Calculate the predicted H–C–H bond angle in ethene, C₂H₄.

Bond length is best defined as:

Which of the following best explains why a C=C bond is stronger than a C–C bond?

A student is told that BF₃ has no lone pairs on the central atom and three B–F bonds. Predict its shape and bond angle.

Sulfur tetrafluoride, SF₄, has four bonding pairs and one lone pair on sulfur. Which shape does it adopt?

Which statement about PH₃ is correct, given that P is in the same group as N?

A newly characterised gas has formula AX₂ where A is the central atom. Spectroscopic data show a bond angle of 104.5°. Which statement about A is most consistent with this observation?

Why is PCl₅ specified as “PCl₅(g)” when describing its trigonal bipyramidal shape?