Chapter 7 - Chemical Quantities and Reactions

Any substance

________ has a molar mass (g /mole) equal to its numerical atomic mass in grams or the sum of the atomic masses, which were multiplied in a formula by their subscriptions.

endothermic reaction

Heat is absorbed during a(n) ________ as the energy of the products is greater than the energy of the reactants.

total weight of reactants

The ________ is equal to the total weight of products in a balanced equation.

chemical equation

The formulas of the substances which respond to a reaction arrow on the left and the products forming on the right side of the reaction arrow are shown by a(n) ________.

exothermal reaction

Heat is released in a(n) ________ because the energy of the products is lower than the energy of the reactants.

initial substances

When the atoms of the ________ rearrange to form new substances, a chemical reaction occurs.