by STAO ADMIN | Nov 13, 2019
This activity illustrates the effect of intermolecular forces on surface tension of a liquid. Students attempt to place drops of various types of liquids on the face of a penny (or any available coin). The substances with stronger intermolecular forces have greater...
by STAO ADMIN | Nov 13, 2019
Heat transfers in physical and chemical reactions have many practical applications. Exothermic reactions release heat to the surroundings, resulting in an increase in surrounding temperature. Endothermic reactions require heat from the surroundings, resulting in a...
by STAO ADMIN | Nov 13, 2019
Osmosis is the process by which the concentrations of two solutions, separated by a selectively permeable membrane, equalize by the movement of a solvent such as water. This demonstration shows that the ability of plant cells to absorb water is decreased by heating....
by STAO ADMIN | Nov 13, 2019
This demonstration shows how water can affect the growth of bread mould.
by STAO ADMIN | Nov 13, 2019
The cells of green plants contain the pigment chlorophyll in organelles called chloroplasts. Chloroplasts capture the Sun’s energy and store it―through photosynthesis―as chemical energy. The reactants for photosynthesis are water, H2O(l), and carbon dioxide, CO2(g)....
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