Gèneral Chemistry 1201 Exam 1 To receive full credit, you must show all worlk 1.

Question

Gèneral Chemistry 1201 Exam 1 To receive full credit, you must show all worlk 1. Which of the following is not true for an exothermic reaction? A. Heat flows from the reaction system to the surroundings B. The temperature of the surroundings rise C. The enthalpy change for the reaction is negative. D. The products have a higher energy than the reactants E. The bonds in the products are stronger than the bonds in the reactants. Which of the following reactions is the mostlikely to be exothermic? A. CaCd@ CO() +CO2@ B. Ca(e) Ca2+() +2 e- 2. D.Cl@ +e. d( The bond strength between Cand a halogen decreases down the halogen group in the periodic table. Based on this trend, predict which of the following gases has the largest (most negative enthalpy of atom combination? A. CCl 3. C. CF D. CL E. They all have the same enthalpy of atom combination

Explanation / Answer

(1)

The following statement is not true for an exothermic reaction:

The products have higher energy than reactants.

This is because when heat goes from system to the surroundings, the energy of products decreases as compared to the reactants.

(2)

The following reaction is exothermic:

Cl(g) + e- ---> Cl-(g)

This is because it is an electron affinity reaction in which the products are more stable than the reactants, so heat will be released in this reaction.

(3)

The stronger the bond, the more negative is the enthalpy of atom combination.

So the correct answer is CF4, because it has the strongest carbon halogen bond.

Hope this helps !

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