Average Reaction Rate
Average Reaction Rate - Related Videos
02:53
Reaction Rate
0 Views •
2020
The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure. The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
01:29
Average Rate of Return
0 Views •
2024
The Average Rate of Return (ARR), or the Accounting Rate of Return (AAR), is a commonly used approach in capital budgeting. ARR measures an investment's profitability by comparing the average accounting profit to the average accounting value. For instance, a retail company considering a $300,000 investment in new inventory management software could use ARR to estimate profitability. If the software is expected to generate an additional $60,000 in annual profits over five years, ARR would give...
03:09
Measuring Reaction Rates
0 Views •
2020
Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
10:49
Determining Rate Laws and the Order of Reaction
0 Views •
2023
Source: Laboratory of Dr. Neal Abrams — SUNY College of Environmental Science and Forestry All chemical reactions have a specific rate defining the progress of reactants going to products. This rate can be influenced by temperature, concentration, and the physical properties of the reactants. The rate also includes the intermediates and transition states that are formed but are neither the reactant nor the product. The rate law defines the role of each reactant in a reaction and can be used to...
01:23
Calculating Average Rate of Return
0 Views •
2024
The Average Rate of Return (ARR) is helpful for businesses evaluating potential investments or capital expenditures. This metric, expressed as a percentage, shows the expected annual return on investment compared to its initial cost. For instance, imagine a manufacturing company investing $300,000 in new machinery. The machinery is projected to generate an additional $60,000 in annual profits over the next five years. The total profit over the lifespan of the investment is $300,000. By dividing...
FAQs
Stoichiometric coefficients make rate comparisons refer to the same overall reaction progress. A substance with a larger coefficient can change in concentration at a different numerical rate than a substance with a smaller coefficient. Applying the coefficients when comparing average reaction rates prevents those values from being interpreted as directly equivalent when they are not.
Because reactant concentrations may change as a reaction proceeds, the selected interval can affect the reported average. Two intervals from the same experiment may therefore produce different values. Stating the time interval alongside the rate is important when describing reaction progress or comparing results from separate measurements.
Average Reaction Rate provides a common measurement for testing how concentration, temperature, or a catalyst affects a reaction. Researchers determine the rate over a defined interval under one set of conditions, repeat the calculation under another, and compare the results. The comparison shows whether the tested factor changes the observed reaction behavior.
To calculate Average Reaction Rate, record the concentration of a reactant or product at the beginning and end of a specified interval. Determine the concentration change, divide that change by elapsed time, and identify whether the substance decreased or increased. When rates for multiple substances are compared, include their stoichiometric coefficients.
Average reaction rate is reported in concentration units per unit of time, because the calculation divides a concentration change by an elapsed time. The concentration and time units should be stated clearly and used consistently, allowing rates from different measurements to be compared without ambiguity.
It condenses concentration changes across a defined period into a value that can be used to track progress. This makes it useful for comparing experimental conditions and examining whether changes in concentration, temperature, or catalyst presence alter the measured behavior. It is especially informative when the goal concerns an interval rather than one moment.