How many sig figs does the number 0.000203 have?

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

What are the chemical names of these compounds? ke: mg3n2: reset next