CHEM 140 Chapter Notes - Chapter 7: Exothermic Reaction, Reaction Rate, Activation Energy

• School: CSULB
• Department: Chemistry and Biochemistry
• Course: CHEM 140
• Professor: P Pierce

Document Summary

Can use to convert to molecules//particles/formula units. Molar mass is the quantity in grams that equals atomic mass of an element. Mm used to convert moles to grams or grams to moles. To calculate molar mass for a compound, we multiply molar mass of each element by its subscript in the formula and add the results. Multiply each molar mass by the number of moles or the subscript in the formula. Add the masses together to get the molar mass. Conversion factors for a compound are also written from the molar mass. A chemical change occurs when a substance is converted into one or more new substances. New properties indicate that a chemical reaction has occurred. Chemical reaction tells us materials we need and the products that will form. In a chemical equation, reactants are written on the left and products are written on the left (aq) means dissolved in water, triangle indicates heat.