chem lab practical

Arrhenius Equation

k = A e^(-Ea/RT), describes the temperature dependence of reaction rates.

Pseudo First-Order Reaction

A reaction that appears to be first-order because one reactant is in excess.

Freezing Point Depression

The lowering of the freezing point of a solvent when a solute is dissolved in it.

Molarity Concentration Equation

M1V1 = M2V2, relates the concentrations and volumes of solutions.

Absorbancy vs. Concentration

Graphing absorbancy as y and concentration as x helps determine the rate of decolorization.

Slope of kobs vs. [OH-]

Represents k2 in the rate of decolorization experiment because H2O is relatively constant.

Equation for Freezing Point Depression

m = dTf / (i * Kf), where m is molality, dTf is the change in freezing point, i is the van 't Hoff factor, and Kf is the freezing point constant.

Chelation

The process of binding to a heavy metal ion.

Solar Cell Material

TiO2 serves as a semiconductor, and SnO2 is used as a coating on glass.

Dye Function in Solar Cells

Mimics photosynthesis by absorbing light to produce a flow of electrons.

Complex Ion Equilibrium

The state where complex ions are in balance in a chemical system.

Ksp

Solubility product constant, a specific type of equilibrium constant for sparingly soluble salts.

Slope of ln vs. 1/T

Gives straight line with slope = -dH/R, in relation to borax solubility.

I- in Solar Cells

Acts as a mediator in the electron flow during the process.

Chemical Kinetics Formula

P = V * L, relates pressure, volume, and latent heat.

Concentration-Rate Relationship

x = ln([Fe3+]), y = ln(Rate) relating concentration of Fe3+ to the reaction rate.