19-2

**Thermodynamics Worksheet** //<---Previous Assignment - Next Assignment--->media type="custom" key="16133446"// **__Instructions__**
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 * 1 Day

//On a new wiki titled __19-2 answer the questions__//

// **__Worksheet__** //

watch the video below and answer questions about it. []

1) Balance the equation (NH 4 ) 2 Cr 2 O 7 (s) ——> Cr 2 O 3 (s) + N 2 (g) + H 2 O(g) 2) What evidence is there that a chemical change has occurred? 3) Is this reaction endothermic or exothermic? 4) (NH 4 ) 2 Cr 2 O 7 (s) ——> Cr 2 O 3 (s) + N 2 (g) + H 2 O(g) (315 kJ)(((((((((((((((((__100 kJ)_____(20 kJ)____(30 kJ) The energy on the left of the eqation is more than on the right. Where did the rest of the energy go? 5) Would an endothermic reaction have more energy on the right or left of the yield sign? 6) since q is the variable for heat, and this reaction lost heat, should q be positive for an exothermic reaction or negative? 7) Why should q be positive for an endothermic reaction? 8) In an endothermic reaction energy is absorbed from the environment, so does that mean it would feel cold because it absorbed energy from you?