8th grade-ch. 1 sec. 1 elements and atoms
TRANSCRIPT
Ch. 1 Sec. 1Elements & Atoms
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
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!
Activity- Nuts & Bolts Naming elements & compounds
Hardware Picture Chemical Symbol Element or Compound
matter•anything that has mass & takes up space
elements •simplest pure substances
•cannot be broken down into any other substances
Elements are the building blocks of matter.
compounds•pure substance made of 2 or more elements chemically combined in a specific ratio
•sugar
mixture• 2 or more pure substances
• not chemically combined
There are two different substances in this mixture.
atom•smallest particle of an element
model• physical, mental, visual, & other representations of an idea
• to help people understand a concept that they cannot observe directly
scientific theory• well-tested idea that explains & connects a wide range of observations
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
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
PARTS OF AN ATOM
• nucleus= central core of atom
• proton= positive electric charge
• neutron= no charge
• electron= negative charge