There are four gases you need to know how to test. Select the correct gas, and fill the blanks for the tests below.

Hydrogen Oxygen Carbon dioxide Chlorine( Hydrogen, Oxygen, Carbon dioxide, Chlorine ) can be tested by placing a lighted splint a glowing splint( a lighted splint, a glowing splint ) over the end of a test tube, and hearing a 'squeaky pop'.

Oxygen Hydrogen Carbon dioxide Chlorine( Oxygen, Hydrogen, Carbon dioxide, Chlorine ) can be tested by placing a glowing splint lighted splint( glowing splint, lighted splint ) over the end of a test tube, and seeing it relight.

Carbon dioxide Oxygen Hydrogen Chlorine( Carbon dioxide, Oxygen, Hydrogen, Chlorine ) can be tested by bubbling the gas through limewater, and seeing it turn cloudy.

Chlorine Oxygen Hydrogen Carbon dioxide( Chlorine, Oxygen, Hydrogen, Carbon dioxide ) can be tested for by holding damp blue dry blue damp red dry red( damp blue, dry blue, damp red, dry red ) litmus paper over the end of a test tube, and seeing it turn red, then white blue, then white( red, then white, blue, then white ).

A formulation is a mixture compound element( mixture, compound, element ) that has been designed as a useful product.