Use the graphs if you need a visual to help answer the following questions.  Compare and contrast endothermic and exothermic. Hint:  Start with the definition of the 2 terms. How is exothermic different from endothermic and what characteristics do they share? Explain this formula:          Energy change = Energy in (reactants)  -   Energy out(products)  Hints below:  a.  When will this formula have a negative outcome and when will it have a positive outcome?  b.  Identify the negative and positive outcomes as endothermic or exothermic.

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Use the References to access important values if needed for this question. When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. Thermometer Cardboard or In the laboratory a general chemistry student finds that when 14.72 g of BaBr2(s) are Styrofoam lid dissolved in 101.00 g of water, the temperature of the solution increases from 22.80 to 25.27 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.82 J/°C. Nested Styrofoam cups Based on the student's observation, calculate the enthalpy of dissolution of BaBr2(s) in kJ/mol. Reaction occurs in solution. Assume the specific heat of the solution is equal to the specific heat of water. AHdissolution = kJ/mol

In order to break water into hydrogen and oxygen, water is heated to more than 500°C. Which kind of reaction is this and why? It is exothermic because heat needs to be released by the reactants to form the products. It is endothermic because heat needs to be released by the reactants to form the products It is exothermic because heat needs to be absorbed by the reactants to form the products. It is endothermic because heat needs to be absorbed by the reactants to form the products.

* 00 Σ In your own words, differentiate between an endothermic and exothermic reaction in one complete sentence. $ 4 9. Ə p alt

What is AH (in kJ/mole) for the reaction shown below? Be sure the specify whether your answer is positive or negative. Use Table 6.1 from your textbook. AH is + Br₂ Br + HBr