How is an endothermic reaction identified in an equation? O A. Heat is included as a reactant in the reaction.
O B. The word endothermic is written above the arrow.
O c. Heat is included as a product of the reaction.
O D. The word endothermic is written after the equation.

What is the mass of 8 moles of sodium atoms

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?