Live practice

A pure solid or liquid has constant density and therefore constant activity at fixed temperature. Its contribution is incorporated into K.

With chemistry signs, absorbed heat is positive and work done by the system is negative.

Count bonding and lone-pair domains about the central atom; electron domains adopt maximum separation. Lone pairs modify molecular shape.

Berkelium was named after Berkeley, the location of the laboratory. Seaborgium honours Glenn T. Seaborg.

Frequency is the reciprocal of period. Then apply λ=c/ν and wavenumber=1/λ.

The required mass equals the copper mass fraction in CuSO₄ multiplied by the sample mass.

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

Convert both values to SI units and use λ=\(\frac{v}{f}\).

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

Apply the two initial conditions at t=0.

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

A monatomic atom has three translational degrees of freedom, so its mean energy is 3kT/2.

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

Apply the first law per unit time.