6. Give on standard test for Carbon Dioxide. Also write the equation involved. Is it a Physical or a Chemical-change?
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Carbon dioxide is an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas.
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The reaction involved is: Carbon dioxide gas combines with calcium carbonate (lime water) to form, calcium carbonate and water. It is a chemical change because the substance has transformed into a new substance, having different chemical composition
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