8th Grade-Ch. 1 Sec. 1 Elements and Atoms
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Transcript of 8th Grade-Ch. 1 Sec. 1 Elements and Atoms
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Ch. 1 Sec. 1Elements & Atoms
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ACTIVITY-NUTS & BOLTS
• Assemble as many elements & compounds as you can (at least 15) from the materials provided.
• Draw pictures & name each element & compound.
bolt
Bl
hex nut
Hx
1 bolt & 1 hex nut = BlHx
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Activity- Nuts & Bolts Naming elements & compounds
Picture Chemical Symbol Element or Compound
small bolt So Elarge bolt Bb E
hex nut (H) Hx E
small bolt + hex nut
SbH C
small bolt + 2 hex nuts
SbH 2 C
*Challenge* Make & name a compound with 6 different pieces of hardware!
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Activity- Nuts & Bolts Naming elements & compounds
Hardware Picture Chemical Symbol Element or Compound
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matter•anything that has mass & takes up space
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elements •simplest pure substances
•cannot be broken down into any other substances
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Elements are the building blocks of matter.
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compounds•pure substance made of 2 or more elements chemically combined in a specific ratio
•sugar
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mixture• 2 or more pure substances
• not chemically combined
There are two different substances in this mixture.
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atom•smallest particle of an element
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model• physical, mental, visual, & other representations of an idea
• to help people understand a concept that they cannot observe directly
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scientific theory• well-tested idea that explains & connects a wide range of observations
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scientist discovery model
John Dalton
J.J. Thomson
negatively charged particles -positively charged particles
Ernest Rutherford
positively charged nucleus
Look in TB on pg. 8
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scientist discovery model
Niels Bohr
electrons move in certain orbits around nucleus
1920’s scientists
electrons can be anywhere in a cloudlike region around nucleus
James Chadwick
discovered neutron
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PARTS OF AN ATOM
• nucleus= central core of atom
• proton= positive electric charge
• neutron= no charge
• electron= negative charge