Hydrogen gas was cooled from 423K to 323K. Its new volume is 75 mL. What was its original volume?

An alkaline battery produces electrical energy according to the following equation. Zn (s) + 2 MnO2 (s) + H2O (l) Zn (OH) 2 (s) + Mn2O3 (s) (a) Determine the limiting reactant if 17.5 g Zn and 31.0 g MnO2 are used.

Which atomic property is different in each isotope of an element?

If an electron fell to a lower orbit or energy level, energy would be a. created. b. emitted. c. absorbed. d. transferred.

Only 10% of energy available at each trophic level moves on to the next level. What happens to the other 90%

What is the volume of 1.2 moles of water vapor at STP?

For the reaction H2SO4 + 2Na2OH4 - > Na2SO4 + 2H2O If you want to make 5 moles of Na2SO4, how many miles of H2SO4 do you need? A) 5 B) 10 C) 12 D) 2

Which element from the periodic table has four valence electrons

Describe the structure and bonding of a thermosoftening polymer and explain why they melt when heated.

How many F atoms are there in 0.035 mol CF4

What type of reaction does the equation below represent? N2 + 3H2 - > 2NH3 a. synthesis b. decomposition c. single replacement d. double replacement