science final exam
Terms
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- physical properties
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what can be observed with out changing the substance
ex: melting point
luster - chemical properties
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the ability to change into another another substance
ex: Mg burns=MgO
tarnishing
rust - metallic properties
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- change shape
- conduct electricity and heat - properties of ionic compounds
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- ionic crystals
- high melting point
- electrical conductivity
*when disolved in water - evidence of chemical reactions
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- formation of a new substance
- changes in energy - What are the rate of chemical reactions controlled by?
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- surface area
- temperature
- concentration
- catalyst
*increases rate by lowering activation energy
inhibitors - decrease rate of reaction - combustion
- rapid reaction between oxygen and fuel
- fire triangle
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three things necessary to start a fire
- fuel
- oxygen
- heat - effects of solutes on solvents
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lower freezing poing
higher boiling point - science final
- maonday
- properties of acids
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- sour taste
- react with metals
- react with carbonates
- react with indicator(red)
ex: HCl H2SO4 - properties of bases
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- bitter taste
- slippery feel
- react with indicator(blue)
ex: sodium hydroxide NaOH-lye
ammonia NH3
calciumoxide CaO - hydrogen ions
- positively charged ions formed by a hydrogen atom that has lost an electron
- forms of pure caron
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- diamonds crystal strucure
- graphite layers-weak
- fullerenes hollow sphere
- nanotubes cylindrical - polymers in plastic
- large molecule made up of smaller molecules