Live practice

Identify whether a group is replaced, added across a multiple bond, or removed to create a multiple bond.

Bromine is a stronger oxidant than iodine. I₂ removes only enough electrons to form tetrathionate, whereas Br₂ oxidises sulfur fully to sulfate.

Forty percent conversion gives equilibrium amounts 0.6,0.6,0.4,0.4 mol. Equal volume powers cancel.

Apply formation enthalpies to CH₃OH+3/2O₂→CO₂+2H₂O.

Each metal loses its valence electrons and the non-metal completes an octet. Balance the number transferred.

These conditions exclude bonding, intermolecular forces and excitation energy. They provide the same reference state for every element, making values comparable.

The ionisation energy from level n is the magnitude of En=−2.18×10⁻¹⁸/n² J.

The SI unit is tied to a fixed fundamental constant, which makes the definition reproducible without relying on a physical prototype.

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

Use mass and linear density to find length. For the fundamental, f=v/(2L).

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

The amplitude is half the stroke. Convert angular frequency to radians per second.