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

Answer choices A,B, and C are CHEMICAL properties, making D. Wood is softer than coal the correct answer. 

The physical property is D, that its softer than coal, because the other 3 describe chemical changes

Answerit curves up and levels out.explanationwe assume that the container contains absolutely no ammonia to begin with as it states that "nitrogen gas and hydrogen gas" react to "produce ammonia."at dynamic equilibrium, the product and reactant concentrations are equal.this means that, starting from a concentration of zero, [nh₃] must curve "up" from zero and then level out to a constant concentration.

Naoh + hbr -> nabr (salt) + h2o ca (oh)2 + 2hbr - - - > ca (br)2 + 2h2o