Which two periods have the same number of elements

Describe the energy in coal and the way in which it's converted to electrical energy. Write 50 to 100 words.

10. Which one of the following statements about sulfuric acid is correct? A. Sulfuric acid has little effect on metals. B. Sulfuric acid is a known muriatic acid. C. Sulfuric acid is a strong oxidizing agent.

Five unknown compounds are added to water. four of the compounds go into solution while one does not. what property does water possess that allows these four compounds to dissolve? why might the fifth compound not dissolve?

Weird type of bond. (show work) Agl CdSn HS Pb2S2 Cl2 KSn TIO2

Hydrogen and oxygen react with each other according to the equation 2H₂ (g) + O₂ (g) → 2 H₂O (g) If 5.00 mol of O₂ react with an unlimited amount of hydrogen, what amount (in moles) of H₂O will be produced?

Student B pushed on a cart against the wall with 500 N of force. The cart didn't move. How do u explain what happened?

What is unique about the way that transition metals form compounds? a. They don't form compounds c. They can form bonds with the electrons in the two outer-most shells b. They are the most reactive d. They can donate all of their electrons

What prompted rutherford to do the alpha particle scattering experiment?

How many moles of hydrogen would be required to produce 5.0 mol of water?

What is the biggest difference between an exothermic and endothermic process? A. The direction of energy flow. B. The amount of energy transferred. C. The type of energy being transferred. D. The speed with which energy is transferred.