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.

Vocabulary #2 Element and Atoms

element:a substance that cannot be broken down any futher into anything simpler.
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atom:the smallest particle of an element that has the same chemical properties as the element.
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nucleus:an atom dense center, where most of its mass is.
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electron:a negatively charged particle that moves around an atoms nucleus.
proton:a positively charged particle inside an atoms nucleus.
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neutron:a particle wirh no charge inside an atoms nucleus.
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atomic number:the number of protons in an atom.
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metal:any of a group of elements that conduct heat and electricity,is shiny and bendable.
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