Which of the following pairs of elements would most likely form a covalent bond? (a) Sodium and Bromine (c) Calcium and Oxygen (b) Oxygen and Hydrogen (d) Silver and Chlorine
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Ответ:
Explanation:
Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom. In general, ionic bonds occur between elements that are far apart on the periodic table.
Ответ:
moles solute = 25.5 / molar mass
moles solute /0.1 Kg = molality
delta T = molality x 1.86
freezing point = 0°C - delta T