Which is an object in the solar system that is a frozen mass of ice and dust? ·an astroid ·a comet ·a moon ·a planet

What reaction is taking place? 02 + c3h8 = h20 + co2

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 protons, electrons, and neutrons are in each of the following isotopes? a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123