Chemistry Vocab-8th grade

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
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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Chemistry Vocab-8th grade

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Chemistry Vocab-8th grade

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2010-11-11T23:27:41Z

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