Converse of object

• produce: But you aren't going to produce much sulfur trioxide every day.

• use: FDA advises that healthcare providers should closely monitor patients using arsenic trioxide.

• form: In the atmosphere is usually oxidized to form sulfur trioxide, a secondary pollutant.

Preposition: in

• mixture: Adding a catalyst doesn't produce any greater percentage of sulfur trioxide in the equilibrium mixture.

Adjective modifier

• much: In order to get as much sulfur trioxide as possible in the equilibrium mixture, you need as high a pressure as possible.

Noun used with modifier

• arsenic: See also the FDA notice on 19 March 2001 regarding arsenic trioxide above.

• antimony: During burning, antimony trioxide promotes charring of the resin, which reduces the formation of volatile gases.

• sulfur: I'm also about to be involved in an exercise testing response to the release of the chemical sulfur trioxide.

• tungsten: Carl Wilhelm Scheele isolated tungsten trioxide for the first time in 1781.

• chromium: Chromium trioxide is acidic and dissolves in water to give the fairly strong acid, H 2 CrO 4 with p K a 0.74.