HEAT ENERGY CALCULATIONSFEBRUARY 24, 2015

SCIENCE STARTER

• DO THE SCIENCE STARTER• TAKE 3 MINUTES• YOU ARE SEATED AND

SILENT

AIM

•Can the heat of fusion formula be utilized to calculate the amount of heat required when heating water from 40˚C to 60˚C?

SCIENCE STARTER REVIEW•Two pure water samples held in separate

containers at 1 atm must have molecules possessing the same average kinetic energy if the samples have the samea) Volumeb) Temperaturec) Massd) Density

•2. An iron bar at 325K is placed in a sample of water. The iron bar gains energy from the water if the temperature of the water isa) 65Kb) 45Kc) 65ºCd) 45ºC

•3. The boiling point of water at standard pressure isa) 0.000Kb) 100Kc) 273Kd) 373K

•4. Which sample of water will have the highest vapor pressure?a) 10.0 mL at 62ºCb) 20.0 mL at 52ºCc) 30.0 mL at 42ºCd) 40.0 mL at 32ºC

4. A mixture of ice and water is in equilibrium at standard pressure. The temperature of the mixture must be

a) 0ºCb) 100ºCc) 212ºCd) 273ºC

REVIEW

•What is heat energy?•What is specific heat capacity?•What is temperature?

REVIEW

•When would you use the following formula▫q=mCΔT▫q=mHf

▫q=mHv

•What is the amount of heat energy released when 50.0 grams of water is cooled from 20.0˚C to 10.0˚C (Jan 2014 Regent)?

•What is the total amount of heat released when 1.00 gram of H20 (l) is heated from 50.˚C to 65˚C?

•A 10.0 grams sample of H2O (l) at 23.0˚C absorbs 209 joules of heat. What is the final temperature of the H2O (l) sample?

Heat energy•q=mCΔT

q = heat energy (J) m = mass of the substance (g) C = specific heat capacity (J/g K) ΔT = change in temperature of the substance

SUMMARY

•Today we review▫Heat▫Specific heat capacity▫Temperature▫Heat energy formulae

•You were also introduced to heat energy calculations

INDEPENDENT WORK

•LOG ONTO www.coursesites.com•Go to Weekly Assignment•Go to Week of Feb 23 – 27

▫What you need to complete this week Reading and questions Vocabulary Notecard Homework Project AIM PROMPT – must complete each day