2 Molecules and MotionThe motion of molecules produces heatThe more motion, the more heat is generated
3 Heat TransferThe movement of heat from a warmer object to a colder one
4 Forms of heat transferThree forms of heat transfer:ConductionConvectionRadiation
5 ConductionConduction involves the transfer of heat through direct contactHeat conductors conduct heat well, insulators do not
6 ConvectionTakes place in liquids and gases as molecules move in currentsHeat rises and cold settles to the bottom
7 Radiation Heat is transferred through space Energy from the sun being transferred to the Earth
8 QuestionsWhat are the three types of heat transfer?How is conduction different from radiation?
9 What type of heat transfer is involved? Heating a room with a fireplaceEgg cooking in a frying panRoof of a house becoming hot
10 What type of heat transfer? Warm air mass bringing a change in the weatherWire getting hot from an electric appliance
11 Temperature and HeatKinetic energy is the energy of motionTemperature is the measure of the average kinetic energy of an object
12 QuestionHow is kinetic energy related to heat production?
13 Thermometer A instrument used to measure temperature Thermometers commonly have alcohol (with dye) or mercuryDigital thermometers have replaced older ones
14 Celsius ScaleCelsius is the metric scale for measuring temperatureWater freezes at 0ºC and boils at 100ºC
15 Kelvin scaleThe Kelvin scale is a metric temperature scale measured in Kelvin units (K)Formula (273+ºC)= Kelvin
16 QuestionsWhat is the formula for converting a Celsius temperature to a Kelvin temperature?What is the boiling point of water on the Kelvin scale?What is the freezing point of water on the Kelvin scale?
17 Absolute zeroThe temperature in which all molecular motion stops (0 K)
18 QuestionsDescribe absolute zero.What is absolute zero on the Celsius scale?
19 Measuring Heat Increase in temperature Addition of heat A decrease in temperatureRemoval of heat
20 CaloriesUnit for measuring heatThe amount of heat needed to raise 1 gram of water one degree Celsius
21 Temperature Joule is another unit for measuring heat Mass and type of substance determine the amount of temperature change
22 Specific HeatThe ability of a substance to absorb heat energy (specific heat)Different substances absorb heat at different ratesThe greater the mass of the object the more heat is absorbed
23 What is a calorimeter?Device used to measure the heat given off during chemical reactions
24 QuestionsHow can heat be measured?What is the unit used to measure heat?What is specific heat?
25 Heat and Phase ChangesA phase change is a physical change that requires a change in heat energyAddition or removal of HEAT
26 QuestionsWhat is freezing point, melting point, and boiling point?
27 Heat expansionThe expansion of a substance due to heatMost solids, liquids, and gases expand as they are heated
28 Expansion of waterBetween 4ºC and 0ºC, water EXPANDS as it cools and turns into a solid
29 ThermostatA thermostat is a device that controls the temperatureThe switch of a thermostat is a bimetallic strip
30 Bimetallic StripTwo different metals that are bound togetherThey expand at different rates when heatedUsed as a switch in a thermostat