White object
* is angular chert fragment, from encasing sediment.
* reflect all colours of light
  - light and black objects absorb all light
  - wavelengths of light
  - energy, dark objects absorb energy
  - whatever kind of light they receive

### white solid:

Ammonium carbonate
* is carbonate
  - the attractant, and the flies are caught on surfaces coated with tangletrap
* white solid.
+ Ammonium carbonate, Properties: Nitrogen compounds :: Carbonates
  * Ammonium carbonate is a white solid. It dissolves in water. It reacts with acids to make an ammonium salt and carbon dioxide. It has a slight smell of ammonia. It reacts with bases to make ammonia gas.

Antimony tetroxide
* is found as the mineral cervantite.
* white solid.
+ Antimony tetroxide, Occurrence and preparation
  * Antimony tetroxide is found as the mineral cervantite. It is made by heating antimony trioxide with air, burning antimony in air, or heated antimony pentoxide strongly
  - Properties: Antimony compounds :: Oxides
  * Antimony tetroxide is a white solid. It is an oxidizing agent. It turns yellow when heated and turns white again when cooled

### white solid:

Antimony trioxide
* causes pneumoconiosis in humans.
* is accepted to be carcinogenic
  - chemical compounds
  - formed when antimony is burnt in air
  - found in two minerals, valentinite and senarmontite
  - made when antimony is made
  - shown for comparison purposes
  - somewhat carcinogenic
  - used as a flame retardant in adhesives, plastics, rubber and textiles
* white solid that dissolves a little in water
+ Antimony trioxide, Occurrence
  * Antimony trioxide is found in two minerals, valentinite and senarmontite. Valentinite is a white mineral that is sometimes pale yellow
  * Antimony trioxide is made when antimony is made. Stibnite is heated with air to make antimony trioxide. It is separated from arsenic by the boiling of the arsenic trioxide before the antimony trioxide boils. Antimony trioxide can also be made by a two step process. Stibnite is burned in air with calcium chloride to make calcium sulfate and antimony trichloride, which is reacted with water to make antimony trioxide
  - Properties: Antimony compounds :: Oxides
  * Antimony trioxide is a white solid. It is the most common antimony compound. It does not dissolve in water. It reacts with oxidizing agents to make antimony pentoxide and with reducing agents to make antimony or stibine
  - Safety
  * Antimony trioxide is somewhat carcinogenic. It is somewhat toxic when eaten or breathed in
+ Antimony, Properties, Chemical compounds: Chemical elements :: Semimetals
  * They are made by reacting antimony with other metals. They react with acids to make the toxic and unstable gas stibine. They are weak oxidizing agents. They are somewhat covalent, having low melting points. Antimony trichloride is a colorless and soft solid that has a strong odor. Antimony trioxide is a white solid that dissolves a little in water. Antimony pentafluoride is highly reactive, as well as antimony pentoxide.

Barium oxide
* is barium
  - made by heating barium carbonate with carbon
  - very toxic when eaten
* whitish powder.
+ Barium oxide, Preparation
  * Barium oxide is made by heating barium carbonate with carbon. This prevents barium peroxide from forming when it is heated. It can also be made by heating barium nitrate
  - Properties: Barium compounds :: Oxides
  * Barium oxide is a white solid. It dissolves in water to make barium hydroxide. It reacts with acids to make barium salts
  - Safety