Question
When exposed to air, calcium first forms calcium oxide, which is then converted to calcium hydroxide, and finally to calcium carbonate. Write a balanced equation for each step.
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Our first metal is a chunk of solid calcium metal. When we place it in unheated distilled water, we observe a vigorous chemical reaction. Bubbles of hydrogen gas are created, the calcium dissolves, and the resulting solution tests as strongly basic (which tells us that hydroxide is now present at a high concentration). We also place it in a highly acidic solution and see a vigorous reaction there as well. Select a balanced ionic equation that describes the reaction in water, remembering that both mass and charge have to be balanced for a reaction to be correct.
Calcium oxide is sometimes very challenging to store in the chemistry laboratory. This compound reacts with moisture in the air and is converted to calcium hydroxide. If a bottle of calcium oxide is left on the shelf too long, it gradually absorbs moisture from the humidity in the laboratory. Eventually the bottle cracks and spills the calcium hydroxide that has been produced. Write the unbalanced chemical equation for this process.
Chemical Reactions: An Introduction
Chemical Equations
Calcium metal is moderately reactive. If pieces of calcium are added to water, the metal begins to bubble as hydrogen gas is formed. The water begins to turn cloudy as solid calcium hydroxide begins to form. Write the unbalanced chemical equation for the reaction of calcium metal with water.
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