Which rock has the highest metamorphic grade? A. rock formed at 500°C and 8 kilobars of pressure B. rock formed at 1,200°C and 20 kilobars of pressure C. rock formed at 400°C and 12 kilobars of pressure D. rock formed at 700°C and 10 kilobars of pressure

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

How many valence electrons are in atom of radon?