A sample of CO2 and a sample of H2 contain the same number of particles at STP. If the CO2 sample has been measured at 20mL, what volume must the H2 occupy in milliliters?

Which is true of transition metals when moving from left to right on the periodic table? the d sublevels are not filled across the period. the cation radii become larger across the period. atomic radii increase slightly and then start to decrease. atomic radii decrease slightly and then start to increase. o

An experimental procedure requires a 10 ml of acid to be dissolved

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.