Here are just a few everyday demonstrations that temperature changes the rate of chemical reaction: Cookies bake faster at higher temperatures. Bread dough rises more quickly in a warm place than in a cool one. Low body temperatures slow down metabolism.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

The yield and rate of a chemical reaction depend on conditions such as temperature and pressure. In industry, chemical engineers design processes that maximise the yield and the rate at which the product is produced. The percentage yield is decreased if the reactants do not completely form the products.

Factors Influencing Yield

• Planting Date. More or less nodes. Total leaf areas (Stronger canopy) Nodulation development.
• Soil Preparation. Compaction (Depth and width or root footprint) pH (Nutrient availability, Rhizobia bacteria population)
• Bean Selection. High-yielding product. Row width (Narrow or bushy bean)

In other words, as the temperature increases, the yield decreases.

The yield could have been improved by repeating the recrystallization process in order forthe substance to be at its purest form. Also, increasing the time of the solution cooling toroom temperature so it can form larger crystals then putting it in the ice bath would yieldmore crystals.