1) Sodium thiosulfate solution reacts with hydrochloric acid to produce sodium chloride, water, sulfur dioxide and sulfur a) water + sodium chloride + sulfur dioxide + sulfur -> sodium thiosulfate + hydrochloric acid b) sodium thiosulfate plus hydrochloric acid = sodium chloride plus water + sulfur dioxide + sulfur c) sodium thiosulfate +hydrochloric acid -> water + sodium chloride + sulfur dioxide + sulfur d) sodium thiosulfate + hyrdrochloric acid -> water +sulfur 2) Iron reacts with oxygen to form iron oxide a) iron plus oxygen -> iron oxide b) iron oxide + oxygen -> iron c) iron + oxygen = iron oxide d) iron + oxygen -> iron oxide 3) Sodium chloride is made when chlorine reacts with sodium a) sodium chloride -> sodium + chlorine b) sodium + chlorine = sodium chloride c) sodium + chlorine -> sodium chloride d) sodium + chlorine -> sodium oxide 4) Calcium fluoride is made when calcium and fluorine react a) calcium + fluorine -> calcium fluoride b) calcium = fluorine plus calcium fluoride c) calcium fluoride + calcium -> fluorine d) calcium fluoride -> calcium + fluorine

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