How does a decrease in the temperature of a chemical reaction affect the reaction rate? The reaction rate decreases. The reaction rate does not change. The reaction rate increases. How does an increase in the reactant concentration affect the reaction rate of a chemical reaction? The reaction rate increases. The reaction rate decreases. The reaction rate does not change. A chemist has three compounds of similar molecular weight, but with different dominant intermolecular forces. Select the compound that should have the lowest boiling point, based on the compound's dominant intermolecular force. the compound in which hydrogen bonding is dominant the compound in which dipole-dipole forces are dominant the compound in which covalent bonds are dominant the compound in which dispersion forces are dominant