Item no.: P3020861 Principle When a strong acid is neutralised with a strong base in dilute solution, the same amount of heat is always released. If the reaction takes place under isobaric conditions, this heat is known as the enthalpy of neutralisation. The chemical reaction which generates this heat is the reaction of protons and
Item no.: P3010501 Principle The molar mass of a liquid is to be determined by evaporating a liquid at constant temperature and pressure, and measuring the volume of vapour formed using a calibrated gas syringe. Tasks Determine the molar masses of diethyl ether and methanol. Discuss the results in terms of the real and ideal
Item no.: P3030960 Principle Carboxylic acids are potential electrolytes which exist in a weakly dissociated condition in aqueous solutions. The location of the dissociation equilibrium is quantitatively described by the Ka or pKa value which can be determined with potentiometric measurements. Tasks Measure the alteration of the pH value during a titration of approximately 0.1
Item no.: P5161200 Principle This experiment explains the fundamental principles of the image formation with a CT algorithm. A simple test object is used to create an attenuation tomogram and a time-of-flight tomogram followed by a discussion of the respective differences. Tasks Creation of several attenuation and time-of-flight tomograms. Variation of the device parameters. Discussion
Item no.: P1313600 Principle As a result of the need to save energy and the increased consciousness of environmental problems, biotechnological production methods are on the advance. Fermenters are used for the biotechnological production of enzymes and other products using bacteria, yeast and cell cultures. For educational purposes a bubble bioreactor used in this experiment
Item no.: P4010711 Principle Interactive learning and teaching system with one neurosimulator for up to 30 experiments covering nerve cells. Tasks use the nerve function model to study the following aspects of a nerve cell: intercellular potential, action potential, the different types of synapses. What you can learn about Comparison between low and high threshold and
Item no.: P4140200 Principle Microorganisms are ubiquitous, i.e. they are present everywhere around us. This fact can be proved by touching the objects that are to be examined in view of the presence of microorganisms against the sterile nutrient medium in a Petri dish and by incubating the plates afterwards. The easy working methods that
Item no.: P4120360 Principle The enzymatic hydrolysis of urea in aqueous solution liberates carbon dixide and ammonia. The ions of these compounds increase the conductivity of the solution. Conductivity measurements can so be made to determine the rate of hydrolysis of urea by the enzyme urease at various substrate concentrations. Tasks The Michaelis constant can
Item no.: P4070760 Principle Electronystagmography (ENG) is an electrophysiological diagnostic procedure for measuring the movement of the eyes. Several electrodes measure the potential differences that are caused by the eye movements. When looking at a moving, regular, repetitive pattern (e.g. the wagons of a passing train, stripes on a rotating drum), the eyes usually try
Item no.: P4070300 Principle As excitation of the light-perceptive cells of the retina always takes a little longer than the light stimulus, only a limited number of stimuli per unit of time can be processed (time-related resolving power of the eye). If a light source is switched on and off periodically in increasingly rapid sequence