Chemistry — Tests for Gases

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