When two substances react chemically to produce a new substance, what is TRUE of the mass of the two substances compared to the mass of the new substance?

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.

Is a pencil falling to the floor anon contact force, a force, or a contact force

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %