Warm Up3-9-15 1.Write a scenario where energy is transferred (ex. making popcorn) 2.A hot frying pan is immersed in water. Describe how heat flows. 3.Turning.

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Warm Up Write a scenario where energy is transferred (ex. making popcorn) 2.A hot frying pan is immersed in water. Describe how heat flows. 3.Turning gas to liquid a _____thermic reaction, because ________ Agenda Go over test Unit 3 Notes Unit 4 Specific Heat One-on-one grade check WS Specific heat Homework Finish WS

TEST UNIT 3 Version atm 18. The heat from the road causes the air to move faster generating more collision and increases pressure. 19. Volume and temperature increases together 20. See board Version The heat from the road causes the air to move faster generating more collision and increases pressure. 18. Volume and temperature increases together atm 20. See board

Specific Heat Unit 4 Day 2

Heat vs. Temperature Heat is energy, and temperature is a measurement of heat Heat is energy in transit –Flows from warm to cooler objects –Measured in joules (J) and calories (cal)

Heat vs. Temperature -Temperature: the measure of the average kinetic energy of the random motion of particles in a substance –Kinetic Energy: energy of an object due to the object’s motion –The hotter the substance, the faster the particles are moving

Heat vs. Temperature Measured in 3 different temperature scales: Fahrenheit, Celsius, and Kelvin Kelvin is based on absolute zero scale. At zero °Kelvin, all molecules froze & stop moving °K = °C °C = °K – 273°C = (°F – 32) x 5 ⁄ 9

Heat vs. Temperature Celsius Scale –0 o C - water freezes/melts –100 o C - water boils Kelvin Scale –0 K- molecular motion stops, also known as absolute zero –0 Kelvin = –273 o C

Transfer of heat does not always result in a temperature change (ΔT) Specific heat – the amount of energy required to raise 1 gram of a substance by one degree of temperature Water has a specific heat of 4.18 J/g·K Specific Heat

CHECK IN The beaker and iron pan both have the same mass. Which will get hot first if the same amount of heat is applied to both?

CHECK IN Which beaker will require more heat to boil? A B

Calculating Specific Heat Different substances respond to heat transfer differently xx m x ΔT x C sp = Q SymbolUnit Massmg Change in temperature (T f – T i ) ΔTK or C Specific heatC sp J/g·K Heat energyQJoule

Calculating Specific Heat Problems You are boiling 100 gram of water from room temperature at 25°C to 100°C. How much heat is required? xx m x ΔT x C sp = Q

Calculating Specific Heat Problems 4 gram sample of glass was heated from 274 ° K to 314 °K and required 32 J of energy. Find the specific heat of this glass xx m x ΔT x C sp = Q

Calculating Specific Heat Problems Determine the mass of a material its specific heat is 2 J/g·K sample absorbed 48.0 J as it was heated from 293 °K to 313 °K xx m x ΔT x C sp = Q

Calculating Specific Heat Problems The specific heat of aluminum is 0.89 J/g o C. If 435 J of energy is added to 100g of aluminum. What is the ΔT?

ASSIGNMENTS Look at your 1 st WU. What were your goals and things you’re going to do differently Notes Summary Worksheet Specific Heat

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