www.usatestprep.com/modules/test/tq.php?testid%=D983&strandid 4935&element=Bidifficulty assessment&assignmen 11 Combustion Reaction Energy from Bond Energies CH + 02 --> CO2 + 2 H20 + heat energy +3000 C 4H 40 Breek 2 0-0 bonds 988 kj Form 2 C-0 bonds -1598 kj +2000- C+ 4H 2 02 CO2 + 4H 20 Break +1000- 4 C-H Form 4 0-H bonds -1836 kj bonds +1644 kj CH+ 2 0, (Reactants) Net Energy Change -802 kj CO2 • 2 H20 (Products) -1000 Study the graph above. Which statement best describes the reaction energy of the reactants and products? This is an exothermic reaction. The net energy change is -802 kJ indicating a release of energy. This is an endothermic reaction. The net energy change is -802 kJ indicating a requirement of energy. This is an endothermic reaction. Since breaking the four Carbon and Hydrogen bonds requires 1,644 kl of energy and forming the two Carbon Oxygen double bonds release -1598 kl of energy, there is a net gain of energy between the Carbon atoms. This is an exothermic reaction. Since breaking the oxygen double bond requires 988 kl of energy and forming the double bond between Cand O releases -1598 kl of energy, there is a net release of energy between the double bonds broken and formed.

A chemist measures the energy change AH during the following reaction: 2 HgO(s) → 2 Hg(1) + O₂(g) Use the information to answer the following questions. This reaction is... Suppose 24.4 g of HgO react. Will any heat be released or absorbed? AH= 182. kJ 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. O endothermic. O exothermic. O Yes, absorbed. O Yes, released. O No. x10 X

A chemist measures the energy change AH during the following reaction: Cl₂(g) + H₂(g) → 2 HCl(g) Use the information to answer the following questions. This reaction is... Suppose 14.7 of Cl₂ react. g Will any heat be released or absorbed? ΔΗ = - 184. kJ 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. endothermic. O exothermic. O Yes, absorbed. Yes, released. O No. ០៤ kJ ☐x10 X

All chemical reactions that are used as fuel must... O Have products higher in energy than reactants. O Have products lower in energy than réactant. O Have products with the same energy as the reactants.

does adding temperature to a chemical reaction favor the reaction endothermically?

The energy of an exothermic reaction is released into the environment O consumed in the reaction converted to another form absorbed by the reaction

So,i do not understand nothing. On how to this. Please explain with steps,and also, can you mark how many times it went up and down,the limit is 8 steps going up. Thanks

Please answer 9d and 9e

Consider the reaction 2 H, + 0, — 2H,О AHrxn -484 kJ Which answer best describes the transfer of heat that occurs when 1.50 mol H, reacts? 363 kJ released 363 kJ absorbed 484 kJ released 726 kJ absorbed 726 kJ released 484 kJ absorbed

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 ?