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Sc ch 15
temperature and thermal energy
| Question | Answer |
|---|---|
| _____________ is the measure of the average value of the kinetic energy of the molecules in a substance; the higher the temperature, the faster the molecules are moving. | Temperature |
| Objects tend to __________ with increased temperature because their molecules ______________ and move farther apart; objects tend to ______ when they are cooled. | expand;shake;contract |
| A thermometer works because the liquid inside expands when ____ and the liquid rises. The liquid contracts and moves down the tube when the temperatures decrease. | heated |
| Thermal energy is the sum of the __________ plus the ___________ energy of all molecules in an object. All objects have thermal energy and it increases as the objects temperature increases. | kinetic; potential |
| ___________is thermal energy that is transferred from one object to another when the objects are at different temperatures | Heat |
| Thermal energy always moves from _______ to _________ objects. | warmer;cooler |
| The transfer of heat by direct contact between the particles of substances is called _______; conduction occurs most easily in _________, where molecules are close together. | conduction; solids/liquids |
| Heat transfer by ___________occurs when electromagnetic waves carry energy through space or matter. | radiation |
| _________ describes the transfer of thermal energy by the movement of molecules from one part (warmer) of a material to another (cooler) part. | Convection |
| Convection occurs naturally as a ____________or _________ moves from one place to another; wind is caused by convection in air; rising warmer air forms a convection cycle with falling cooler air. | gas;liquid |
| __________ are materials that transfer heat readily; __________ such as copper and gold are the best heat conductors. | Conductors; Metals |
| A(n) _______________ is a material that does not transfer heat easily; ___________________ are usually better insulators than solids. | insulator; gasses |
| There are three ways to prepare popcorn - on a stove, in an air popper, and in the microwave. Which method matches each of the ways heat is transferred? Stove- __ - ___ - _____ | conduction;Air Popper;convection;Microwave ;radiation |
| Name three modes of energy transfer. | Convection,conduction radiotion |
Created by:
celiapotter