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13 terms

PS 27 Week Test

STUDY GUIDE
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Chemical
creates a new substance like burning paper (bonds have to be broken or formed and the chemical formula must change)
What is the difference between chemical and physical changes?
See answer #2
Compound
two or more different types of elements chemically combined
What is the difference between a chemical formula and chemical equation?
Chemical formula-H2O
Chemical equation- H2 + O -> H2O
Mechanical
anything in motion
Electrical
anything plugged in
Chemical
anything burning
Thermal
Heat
Electromagnetic
visible light, infrared, ultraviolet, x-rays...
Nuclear
suns, stars, bombs
Physical
changes only a portion of its properties-tearing paper
Mixture
two or more elements that are not chemically combined
Element
atoms that are exactly alike (H2 is an element)