Cobra4

53 Products, 151 Experiments, 29 Sets, 14 Lit./Softw.

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	Conductometric measurement of the saponification of an ester Principle When equimolar amounts of a carbonic acid ester and sodium hydroxide are added to each other, the ester is saponified at a second order reaction velocity. Hydroxide ions, which have a high ionic mobility, are hereby consumed in the conversion of the e ...
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Product-No: P1271860

	Determination of the boiling point of ethanol Principle In this boiling point determination, water and ethanol are heated and the courses of their temperatures are compared.
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Product-No: P1272660

	Heat of fusion of sodium thiosulphate Principle The temperature course during the melting and crystallization of sodium thiosulphate is determined.
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Product-No: P1273460

	Melting and crystallization diagram of a pure substance. Principle When a pure substance is heated or cooled, the temperature of it does not continually increase or decrease when it undergoes a change in the state of aggregation. Instead of this, and despite the continuing external supply or removal of heat respectiv ...
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Product-No: P1282060

	The electrochemical series of metals Principle The characteristics of a metal are determined to a great extent by how easily it can be oxidized. The listing of metals in the succession of their oxidizability, i.e. according to their striving to form cations, is called the electrochemical series of ...
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Product-No: P1282360

	Conductivity of crystalline salts, molten salts and saltsolutions Principle In contrast to non-conductors, conductors must have mobile charge carriers to be able to transport electric current. In metals, these charge carriers are electrons which can easily migrate within the metal lattice ("electron gas"). No such electrons ...
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Product-No: P1282560

	Buoyancy in water on the magnetic board (Archimedes' prin-ciple) Principle Extensive bodies have the property of weighing less when they are in water than when they are in air, which you notice when you swim, for example. For this reason, even heavy container ships can swim, although a small pebble immediately sinks. In this ...
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Product-No: P1297260

	Ohm's law Principle The connection between electrical voltage and the resulting current is measured with various test resistors.The quotient of voltage and current is a constant value that characterises the component.
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Product-No: P1330360

	Ohm's law Principle The connection between electrical voltage and the resulting current is measured with various test resistors.The quotient of voltage and current is a constant value that characterises the component.
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Product-No: P1330361

	Inrush current of a light bulb Principle The behaviour of a filament lamp at the moment it is switched on is to be examined.
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Product-No: P1330860

	Switch-on behaviour of a capacitance Principle The behaviour of the current and voltage at a capacitor at the moment it is switched on is determined here.
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Product-No: P1331060

	Generation of an alternating voltage, rectification and smoothing Principle An alternating voltage is induced in acoil in the (alternating) field of a periodically moving magnet. The characteristic of a diode to allow electric current only to pass in one direction is used to rectify the induced alternating voltage. A capacito ...
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Product-No: P1331360

	We investigate our heartbeat - electrocardiography Principle The heart is a hollow, muscular organ that comprises several secondary muscles. These secondary muscles contract and relax successively, thus pumping the blood through the heart. These muscle activities can be measured electrically as a whole at the ...
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Product-No: P1332760

	Parallel and series connection of helical springs on themagnetic board Principle Helical springs can be connected in parallel as well as in series by hanging them alongside each other or one after the other. This experiment is concerned with the resulting spring constants.
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Product-No: P1337860

	Specific heat capacity of water Principle Cold water is filled in a calorimeter and heated with a heating coil. The relation between the heating power and the temperature increase and also the specific heat capacity of water are determined.
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Product-No: P1349160

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