Question

Useful equations and constants: heat lost/gained = (Volume (Density)(AT)(specific heat capacity) (heat lost by hot water) - Cheat gained by cold water) calorimeter constant = Density co = 1.00 g/mL Specific heat capacity (water) - 4.184 J/g °C 1. What is thermochemistry? (2 pts) 2. A student adds 5.00 mL of cold water to 5.00 mL of hot water in a test tube surrounded by a Styrofoam installation (ie, calorimeter). The initial temperature of the cold water was 15.26 °C, and the initial temperature of the hot water was 33.14 "C. After the student added the hot water to the cold water and waited 100 seconds, the final temperature of the mixture was 28.35 °C a. What is the temperature change of the hot water? (1 pt) b. What is the temperature change of the cold water? (1 pt) c. What is the heat gained by the cold water? (4 pts) d. What is the heat lost by the hot water? (4 pts) e. What is the calorimeter constant? (4 pts) f. What is the chemical system? (1 pt) 8. What is the surroundings? (1 pt) h. Is this reaction exothermic or endothermic? (2 pts)

Answer 1

0. Thermo chenis towy – branch of chemistry which O deals with the quantities of head evolued or absorbed during chemical reaction 1 2. ②. Tomperature change of hot water strot A Trot = 33.-14°C -28.33'0) = 9.81°C b) O Teerd = 28.33€ – 15.26°C) = 13.07 °C . c) Woord = m. cp. Dicord - (5.00 m2 47.00g/ml)(4.184 JgT(-4) (13.67'0) 5 272.15 d) head lost by not water = quotam.cp. It not quor = (5.00 mL X1.oogime) (4.184 5gr 2-') (9.81C) 100.62 ) el calorimeter constant = quot -Leord Teold f g) 600.62.J) - (272.15) --13,120 J "CH? 13.071c Chemical system is the chemical minture which comprise a set of interacting molecules, Surroundings comprise everything else than the system which consists of reacting molecules as calorimeter wnstant is ove, reaction is enothermie also as heat Lost и поле. this