13 terms

Science, 1.2, Chemistry

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study of chemistry
the study of matter and chemical reactions between substances
matter
anything that has mass and volume
4 states of matter
solid, liquid, gas, plasma and the Bose-Einstein condenstates
chemical change
chemicals combine to make a new substance
physical change
changes size and shape as well as state
elephant's toothpaste
chemical reaction
Hydrogen peroxide ----> water and oxygen
- the catalyst was potassium iodide
- exothermic and oxidizing
oxidizing material
you test it by putting a glowing splint in the substance - if the splint catches more on fire then oxygen is present
particle model of matter
1) all matter is made up of very small particles
2) there is space between the particles
3) particles are always moving
4) particles are attracted to each other
how particles exist in solids, liquids and gases
solid - tightly packed, vibrate
liquid - farther apart, slip and slide
gas - very far apart, move around quickly
kinetic energy
energy of motion
kinetic molecular theory
1) all matter is made up of very small particles
2) there is space between the particles
3) particles are always moving
4) energy makes particles move
triangle of states - arrows
the arrows represent the transfer of energy - losing or gaining
pure substances - elements and compounds
elements - lots of the same atom - oxygen (O)
compounds - 2 plus elements - water (H‎2O)