ACS Chemistry Final Exam 2 questions with correct answers

What is the most complete and best description of a covalent bond? CORRECT ANSWER A system of two nuclei where each atom donates one electron to the other atom, thus forming a bond What is not a characteristic of ionic substances? CORRECT ANSWER Their reactions are generally extremely slow. Characteristics of Ionic Substances CORRECT ANSWER -They conduct an electric current when fused. -Those having a common ion exhibit some similar chemical properties. -They lower the vapor pressure of water when dissolved in it. -They raise the boiling point of water when dissolved in it. The addition of a catalyst in a chemical reaction CORRECT ANSWER Provides an alternate path with a different activation energy. What procedure will lower the activation energy for a particular reaction? CORRECT ANSWER adding a catalyst What's an accurate description of the behavior of a catalyst? CORRECT ANSWER A catalyst reduces the activation energy for a reaction and increases the rate of a reaction. What exactly do Catalysts do? CORRECT ANSWER Alter the pathway (mechanism) of a chemical reaction.