UNIT 4 LESSON 8 – CHEMICAL ANALYSIS

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Pure Substances

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14 Terms

1

Pure Substances

Single elements or compounds not mixed with any other substance, with specific melting and boiling temperatures for identification.

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2

Formulations

Mixtures designed as useful products by combining components in measured quantities to achieve desired properties.

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3

Chromatography

Technique to separate mixtures using a stationary and mobile phase, with Rf values to identify compounds based on their movement distances.

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4

Test for Hydrogen

Involves a burning splint producing a pop sound when in contact with hydrogen gas.

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5

Test for Oxygen

Uses a glowing splint that relights in the presence of oxygen gas.

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6

Test for Carbon Dioxide

Involves using limewater that turns milky when shaken with carbon dioxide gas.

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7

Test for Chlorine

Damp litmus paper bleaches and turns white when exposed to chlorine gas.

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8

Flame Tests

Method to identify metal ions by observing the distinctive colors they emit when burned in a flame.

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9

Metal Hydroxides

Sodium hydroxide solution forms colored precipitates with certain metal ions, aiding in their identification.

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10

Identifying Carbonates

Carbonates react with acids to produce carbon dioxide, which can be detected with limewater.

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11

Identifying Halide Ions

Halide ions form characteristic precipitates with silver nitrate, helping in their identification.

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12

Identifying Sulfate Ions

Sulfate ions produce a white precipitate with barium chloride, indicating their presence.

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13

Instrumental Methods

Accurate, sensitive, and rapid techniques to detect and identify elements and compounds.

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14

Flame Emission Spectroscopy

Analytical method using a flame to produce light for identifying metal ions in solution through a line spectrum analysis.

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