vocabulary#4 Temperature and Heat

kinetic energy:the energy of a moving object.




potential energy:energy stored in an object or material.




temperature:the average kinetic energy of the molecule in a material.



heat:energy that flows between objects that have different temperature.



radiation:the transfer of energy by electromagnetic waves.



conduction:the trasfer of energy by direct contact of molecule.



convection:the transfer of energy by the flow of liquid or gas.



insulation:prevents heat from flowing in or out of a material.

vocabulary#3 Chemical Changes

Compound:a chemical combination of two or more elements.











Chemial bond:a link that atoms or electrically charged particles can form with each other.

Chemical formula:a way of using letters and numbers to show how much of each element is in a substance.

Ion:an electrically charged particle with unequal numbers of protons and electrons.

molecule:a group of bonded atoms that acts like a single particle.

chemical property:a way of describing how a substance change chemically with other substance.

exothermic:a reaction that gives off heat.

endothermic:a reaction that absorbs heat.