1. All the following are signs of a chemical reaction exceptA. a release of gas.

1. All the following are signs of a chemical reaction exceptA. a release of gas.B. a change in color or odor.C. a change of state.D. a change in energy.2. Which of the following would not increase the rate of most reactions?A. Adding a catalystB. Increasing the temperatureC. Lowering the concentration of the reactantsD. Removing an inhibitor3. Which of the following is true regarding the inner transition elements?A. They occupy the d block of the periodic table.B. These include all elements in groups 312.C. These include the lanthanides and actinides and do not have f sublevels.D. Their valence electrons can be located in both s and f sublevels.4. What statement does not accurately describe the following equation?A. Oxygen is a reactant.B. This reaction is endothermic.C. This reaction releases energy.D. Eighteen atoms of oxygen are found as both part of the reactants and the products.