Chemistry — Tests for Gases

digraph GasTests {
  rankdir=LR;
  node [shape=box, style=rounded];
  Hydrogen -> "Squeaky pop with a lit splint";
  Oxygen -> "Relights a glowing splint";
  CarbonDioxide [label="Carbon dioxide"];
  CarbonDioxide -> "Turns limewater milky";
  Chlorine -> "Bleaches damp litmus paper";
  Ammonia -> "Turns damp red litmus blue";
}