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Chemistry Vocab-8th grade
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matter
anything that takes up space and has mass
elements
any substance that can't be separated into simpler substances by chemical means
compounds
atoms of different elements bonded together
mixture
2 or more substances physically combined
atom
---basic building block of matter
--smallest part of an element
nucleus
dense, positively charged center
protons
positively charged particles in the nucleus
neutrons
neutral particles in the nucleus (no charge)
electrons
negatively charged particle surrounding the nucleus
atomic mass
represents the total neutrons and protons in an atom
atomic weight
represents the total neutrons and protons in an atom
atomic number
represents the number of protons in an element
isotopes
same number of protons but different number of neutrons
chemical change
-new compounds formed
examples of
: color change, odor, precipitate, bubbling
physical change
NO new compounds formed
-substances only physically mix
precipitate
new solid formed in a chemical reaction
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Author
holtreading
ID
48766
Card Set
Chemistry Vocab-8th grade
Description
Chemistry Vocab-8th grade
Updated
2010-11-11T23:27:41Z
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