Which of the statements is true of the energies of the bonds that break and form in an exothermic reaction? a. The energy required to break the necessary bonds is greater than the energy released when the new bonds form. b. The energy required to break the necessary bonds is about the same as the energy released when the new bonds form. c.The energy required to break the necessary bonds is less than the energy released when the new bonds form.

31 What is true about an exothermic reaction? 1. The reaction gives off heat and the surroundings cool down   2. The reaction gives off heat and the surroundings get warmer   3. The reaction absorbs heat and the surroundings get cooler   4.The reaction absorbs heat and the surroundings get warmer

Calculate the calorimeter constant for her calorimeter by following the steps below. 1. Calculate the mass of the warm water. 2. Calculate the change in temperature of the warm water. 3. Calculate the heat lost by the warm water. 4. Calculate the mass of the cold ocean water. 5. Calculate the change in temperature of the cold water. 6. Calculate the heat gained by the cold water. 7. Calculate the heat lost to the surroundings. 8. Calculate the calorimeter constant.

A chemist measures the energy change AH during the following reaction: Cl₂(g) + H₂(g) → 2 HC1 (g) AH=184. kJ Use the information to answer the following questions. endothermic. This reaction is... 0 exothermic. Suppose 28.0 g of Cl₂ react. Yes, absorbed. Yes, released. Will any heat be released or absorbed? No. If you said heat will be released or absorbed in the second part of this question, calculate how much heat will be released or absorbed. Round your answer to 3 significant digits. ☐kJ x10 X ?

10. An example of an exothermic reaction would show energy:   Group of answer choices a) as part of the reactant side of the reaction b) being absorbed by the chemical reaction c) at a higher state then when the reaction started. d) as part of the product side of the reaction.

A sample of 175°C copper is placed into a beaker with 100 grams of 25°C water. Which sample of copper will heat the water to the lowest final temperature? The specific heat of copper is 0.385 J-g-1.°C-1. The specific heat of water is 4.184 J·g-1.°C-1. A. 5.0 g Cu B. 2.0 g Cu C. 0.5 g Cu D. 1.0 g Cu

Nature favors exothermic reactions because after such a reaction     a. energy previously held in many particles is now concentrated in a few, resulting in a temperature fall.   b. energy previously concentrated in a few particles is now dispersed over more particles in the system.   c. energy previously concentrated in a few particles is now dispersed over more particles in both the system and the surroundings.   d. energy previously concentrated in a few particles is now dispersed over more particles in the surroundings.   e. energy previously held in many particles is now concentrated in a few, resulting in a temperature rise.

Which one of the following statements is not correct? Select one: a. In any physical process, such as dew forming on grass or carbon dioxide subliming, the internal energy of the system does not change. b. When dew forms on grass overnight, the energy of the water molecules decreases. c. When dry ice sublimes to form CO2(g), the energy of the carbon dioxide increases. d. When dew forms on grass overnight, the energy of the surroundings (grass, air, etc.) increases. e. When dry ice sublimes to form CO2(g), the internal energy of the surroundings decreases.

7. Which of the following refers to a process where energy leaves the system?  A.Work B.Exothermic process C.Heat D.Endothermic process