Page 7 - Curriculum Visions Dynamic Book

alkaline: the opposite of acidic. Alkalis are bases
that dissolve, and alkaline materials are called basic materials. Solutions of alkalis have a pH greater than 7.0 because they contain relatively few hydrogen ions.
corrosion: the slow decay of a substance resulting from contact with gases and liquids in the environment. The term is often applied to metals. Rust is the corrosion of iron.
 The pellet immediately begins to fizz (react) on the surface, skimming about and creating a trail that can be seen in this enlarged picture. The heat
released causes the metal to form a rolling molten
ball. Notice that the
water has turned
bright pink.
indicator: a substance or mixture of substances that change colour with acidity or alkalinity.
reactivity: the tendency of a substance to react with other substances. The term is most widely used in comparing the reactivity of metals. Metals are arranged in a reactivity series.
Also...
Sodium metal is
made by passing
an electric current
through table salt
(sodium chloride) that
has been heated to its melting point. This process also produces chlorine,
which can be used separately.
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