A. Explain the difference between an exothermic chemical reaction and an endothermic chemical reaction.

B. How is the enthalpy of reaction related to the enthalpies of formation for the products and reactants?

What do chemists mean by the term electronegativity? what does its electronegativity tell us about the atom?

Which transformation could take place at the anode of an electrochemical cell? Which transformation could take place at the anode of an electrochemical cell?

In the commercial manufacture of nitric acid, how many liters of nitrogen dioxide will produce 30 liters of nitric oxide given that both gases are at STP? 3NO2 + H2O 2HNO3 + NO A) 20 liters B) 0.1 liters C) 40 liters D) 90 liters E) 1.01 liters

Which system takes in oxygen and releases carbon dioxide?

Consider the following unbalanced reaction for the combustion of hexane: C6H14 (g) + O2 (g) - -> CO2 (g) + H2O (g) Balance the equation and determine how many grams of CO 2 gas will form when 5.35 grams of C6H14 reacts with excess O2.

Where are two places that scientists obtain scientific knowledge

Which of the following best describes what happens when an ionic bond forms? A) two atoms come together and share electrons in order to fill their octets. B) two atoms give up their electrons in order to form a bond.

Describe the attraction between 2 atoms as a result of sharing electrons

I need to know about mitosis and meiosis

What is sediment and debris, and what role does it play in the way sedimentary rock forms?