Iron(iii) oxide is formed when iron combines with oxygen in the air. how many grams of fe2o3 are formed when 25.9 g of fe reacts completely with oxygen? 4fe(s) + 3o2(g) > 2fe2o3(s)

a.12.0g b. 25.0g c. 37.0g d. 49.0g

Which statement names the physical property of wood a. wood is softer than coal b. wood does not rust c. wood can rot d. wood can burn

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

Some familiar products contain some of the same types of atoms. for instance, the chemical formula for baking soda is nahco 3. the chemical formula for liquid bleach is naclo, and the chemical formula for table salt is nacl. which choice best describes why these three products have some of the same types of atoms in common?