# Apch06_revans08 - South Pasadena AP Chemistry ANSWERS Name Period Date 6 Energy and Chemical Reactions Station 1 EXOTHERMIC AND ENDOTHERMIC

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South Pasadena AP Chemistry ANSWERS Name __________________________________ Period ___ Date ___/___/___ 6 Energy and Chemical Reactions Station 1 EXOTHERMIC AND ENDOTHERMIC Classify each statement as talking about an [EXO]thermic or [ENDO]thermic reaction: _ EXO __ surroundings get hot _ ENDO _ PE diagram is uphill _ EXO __ energy is a product _ ENDO _ H is positive _ EXO __ reactants have more energy _ EXO __ H is negative _ EXO __ PE diagram is downhill _ ENDO _ surroundings get cold _ ENDO _ products have more energy _ ENDO _ energy is a reactant South Pasadena AP Chemistry 6 Energy and Chemical Reactions Station 2 HEAT CALCULATIONS 45.0 mL = 45.0 g (density of water is 1 g/mL) A 45.0 mL sample of water is heated from 15.0°C to 35.0°C. How many joules of energy have been absorbed by the water? (Show work) q = mc T = (45.0 g)(4.184 J·g -1 ·°C -1 If 5430 J of energy is used to heat 1.25 L of room temperature water (23.0°C), what is the final temperature of the water? q = mc T 5430 J = (1,250 g)(4.184 J·g -1 ·°C -1 )(x) x = 1.0°C T final

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South Pasadena AP Chemistry 6 Energy and Chemical Reactions
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## This note was uploaded on 02/12/2012 for the course CHEMI 0043 taught by Professor Kaisasantos during the Summer '11 term at Pontificia Universidad Catolica Madre y Maestra.

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Apch06_revans08 - South Pasadena AP Chemistry ANSWERS Name Period Date 6 Energy and Chemical Reactions Station 1 EXOTHERMIC AND ENDOTHERMIC

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