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Material and Energy Balances Quiz Screencasts

Each screencast has at least one interactive quiz during the video. The description above each video provides a brief summary.

Description: Defines adiabatic flame temperature, describes how to calculate it, and discusses issues that affect the accuracy of the calculation.

Description: Derives average molecular weight given mass or molar compositions.

Description: Discusses plot of temperature vs. mole fraction for an ideal binary solution, including bubble and dew points.

Description: Describes a bypass stream in a process and provides an example problem.

Description: Demonstrates how to use the percent yield in order to determine the amount of theoretical reagents needed in a reaction.

Description: Describes a cubic equation of state (EOS) and demonstrates how a real gas can differ from an ideal gas.

Description: Demonstrates using degree of freedom analysis on a multiple unit process to solve for unknown stream parameters.

Description: Demonstrates using degree of freedom analysis on a multiple unit process.

Description: Defines and differentiates density, specific volume, and specific gravity.

Description: Uses Raoult’s law and the Clausius-Clapeyron equation to derive an equation for the increase in boiling point of a solvent when a solute is added. The solute does not dissociate.

Description: Explains the steps in crystallization that includes an evaporator, a crystallizer and filter, and a recycle stream.

Description: Describes dimensional analysis.

Description: Explains the terms for a chemical reactor energy balance that uses enthalpies of reactants and products that are based on elements as reference states.

Description: Explains the terms for a chemical reactor energy balance that uses the heat of reaction and extent of reaction.

Description: Solves a material balance problem on a system with a purge.

Description: Describes extent of reaction method for solving material balances with chemical reactions. Includes example.

Description: Explains how to take a problem description and build a flowchart from it.

Description: Overview of SI and American Engineering units used for force.

Description: Defines the term fractional conversion.

Description: A general mass balance is presented and simplifications of the balance are shown for different processes.

Description: Introduction to processes and the general material balance. A short example on a tank with inlet and outlet flow.

Description: Defines heat capacity, shows how it depends on temperature, and shows how it is used to calculate enthalpy changes.

Description: Discusses how to use heat of combustion to determine reaction enthalpy

Description: Explains Hess’s law and provides an example of how to use it to solve for the heat of reaction for an equation.

Description: Explanation of how to convert units.

Description: Explains how to determine heats of reaction at 298 K from heats of formation and how to calculate heats of reaction at elevated temperatures.

Description: Explains how to read on a psychrometric chart: dry bulb temperature, relative humidity, moisture content, dew point temperature, enthalpy, humid air volume, and wet bulb temperature. The simulation is located at https://www.learncheme.com/simulations/mass-energy-balances/reading-a-psychrometric-chart.

Description: Introduces steam tables, explains how to use them, and explains the difference between superheated and saturated steam.

Description: Constructs a hypothetical process path to simplify calculations for state functions.

Description: This screencast introduces the concept of ideal gases and how to calculate enthalpy and internal energy changes for an ideal gas.

Description: Overview of sensible and latent heats and how to account for phase changes in energy balances.

Description: Explains the concept of adsorption and derives the Langmuir isotherm

Description: Explains how to calculate degrees of freedom and performs two examples on single unit processes.

Description: An introduction to the first law and explanation of the terms in the energy balance.

Description: The mechanical energy balance is obtained from the steady-state energy balance, and under some conditions, it simplifies to the Bernoulli equation.

Description: Defines the different types of pressure. Uses head pressure to solve an example problem.

Description: Explains the meanings of saturated and supersaturated solutions and discusses the temperature dependence of solubility.

Description: Derives the Langmuir isotherm for dissociative adsorption of hydrogen on a Pt catalyst.

Description: An introduction to Langmuir Isotherms.

Description: Provides an overview of latent heat. Calculates the heat required to vaporize and condense 100 mol of water at 100°C and atmospheric pressure.

Description: An overview on manometers and how they are used to determine force differentials.

Description: An overview on how to change molar fractions to mass fractions and vice-versa.

Description: A description on the relationship between density, mass flow rate and volumetric flow rate. An example conceptual problem is discussed.

Description: Gives the energy balance for both open and closed systems and compares the two.

Description: Overview of combustion which is the reaction of fuel (usually hydrocarbons) with oxygen to produce water, carbon dioxide/carbon monoxide, and energy. Quickly reviews percent excess air and wet/dry basis

Description: Introduces percent excess air for combustion reactions.

Description: Explains reference states and shows how to use them in calculating enthalpy changes for a variety of systems

Description: Describes how to obtain and use a scaling factor.

Description: The rules for significant figures are presented. Examples are given of how to add, subtract, multiply, and divide numbers so that the answer has the correct number of significant figures.

Description: Describes Pressure-Temperature diagram for a single-component.

Description: Overview of standard conditions (temperature and pressure) and its use with the ideal gas law.

Description: Reviews stoichiometry and limiting reactants.

Description: Compares SI and American units. Discusses base units and derived units.

Description: Describes the different temperature scales.

Description: Explains what the critical point is and shows constant volume process at the critical volume, includes a demo.

Description: Uses three different methods for solving reaction problems.

Description: Uses the extent of reaction method for two reactions.

Description: Uses a salt solubility diagram to determine concentrations of salt solute in water for a crystallizer material balance.

Description: Introduction to the Virial equation of state.

Description: Discusses the difference between wet and dry basis analysis. Shows how to convert from a wet basis to a dry basis.

Description: Defines quantity with value and units.

Description: Presents the definition of enthalpy, its differential, and its use in energy balances.