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Questions for Discussion · What are Cd, Hg, Te, Zn? · What do these elements have in common? Hint: Look at their position on the periodic table of the elements.
Dendrites are branching structures that develop as a molten metal solidifies under certain conditions. The root of this word is the (Greek dendron, meaning tree. Branching structures in biology (nerve cells) and geology (drainage systems) are also referred to as being dendritic.
Science Standards
A gradient is the variation of a quantity such as temperature, pressure, or concentration with respect to a given parameter, typically distance. A temperature gradient can have dimensions of temperature per length, for example, C/cm.
A dopant is an impurity intentionally added to a pure semiconductor to alter its electronic or optical properties.
A surfactant is a substance added to a liquid to change its surface tension. Surfactants are used in experiments where a liquid must wet its container in a particular way. A common use of surfactants is dishwashing detergent. The surfactant properties of the detergent is what causes food grease and oil to separate from most household dishware.
Zeolites are hydrous aluminum silicate minerals which also contain positively charged ions of sodium, potassium, calcium, strontium, barium, or a synthetic compound. They are commonly used as molecular filters. For example, they are used to make every drop of gasoline sold in the United States. |
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