Indicators are used to identify acids, alkalis and neutral substances. They work by changing ____ depending on the chemical they are put into. One common example is ____ indicator solution. This indicator is ____ in strong acids, ____ in weak acids, ____ in weak alkalis and ____ in strong alkalis. It is ____ if the substance is ____ (neither acid nor alkali). We identify oxygen using a ____ splint. If placed into a tube of oxygen gas, a glowing splint will ____.To identify hydrogen gas we use a ____ splint. We hear a ____ ____ if hydrogen is present. To identify the presence of carbon dioxide gas, we use a chemical called ____. When carbon dioxide is bubbled into it, the limewater changes from clear to ____ white. We use a piece of blue ____ paper to test for the presence of ____ gas. Because chlorine is a ____, we see the litmus paper changing to ____. We use flame tests to identify ____ that are present in compounds. This is because different metal compounds produce different ____ flames. To carry out the flame test, a ____ splint is dipped into the compound and is then held in the ____ Bunsen burner flame.Lithium compounds turn the flame ____, sodium compounds turn the flame ____, potassium compounds turn the flame ____ and copper compounds turn the flame ____. To identify chloride, bromide and iodide compounds we use a chemical called ____ ____ solution. First of all, the compound being tested must be ____ in water to make a ____. Silver nitrate solution is then added and a ____ is seen. A precipitate is a ____ that forms when solutions react together. Chloride compounds form a ____ precipitate with silver nitrate solution, bromide compounds produce a ____ precipitate and iodide compounds produce a ____ precipitate. To identify ____ compounds we use a chemical called barium ____ solution. If this chemical is added to a solution of a sulfate compound, we see a ____ precipitate forming.To identify ____ compounds we use an ____. Adding acid to a carbonate compound will cause carbon dioxide gas to be released. We see ____ as this happens. We could bubble the gas into ____ to prove that it is carbon dioxide. We would see the limewater becoming ____.

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