Which of the following is a chemical change? Folding a piece of paper
Cutting a piece of paper
Burning a piece of paper
Tearing a piece of paper

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate