CHM135H1 Chapter 2: Chapter 2
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CHM135H1 Full Course Notes
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Robert boyle- element cannot be broken down, elements come together to form chemical compounds. Chemical equation- chemical reaction shown with chemical formulas of reactants and products. Law of mass conservation- lavoisier discovered mass neither created nor destroyed. Law of definite proportions- proust discovered different samples of a pure chemical compound always contain the same proportion of elements by mass: elements combine in specific proportions, not in random proportions. Law of multiple proportions- dalton found elements can combine in different ways to form different chemical compounds with mass ratios that are small whole number multiples of each other. Dalton reasoned: elements are made out of atoms, element characterized by mass of atoms. Thompson (cathode-ray tubes) electrons (electrons deflected in tube: amount of deflection of the electron beam in tube due to a nearby magnetic or electric field should depend on 3 factors: Strength of the deflecting magnetic or electric field. Size of the negative charge on the electron.
