Bellwork 09/12_MartinezPaola - 1 What is Daltons Atomic...

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1. What is Dalton’s Atomic Theory? 1. Elements are composed of minute indivisible particles called atoms. 2. Atoms of the same element are alike in mass and size. 3. Atoms of different elements have different masses and sizes. 4. Chemical compounds are formed by the union of two or atoms of different elements. 5. Atoms of two elements may combine in different ratios to form more than one compound 2. Fill out the chart for the 3 particles that comprise the atom. Particle Mass Charge Location Protons +1 1 amu nucleus Electrons -1 <<<1 outer Neutrons neutral 1 amu nucleus 3. What is the Law of Definite Composition? The percent by mass of hydrogen in water is 11.2%. The percent by mass of oxygen in water is 88.8%. Water always has these percentages. If the percentages were different, the compound would not be water 4 What is the Law of Multiple Proportions? Use water and hydrogen peroxide (H2O2) to illustrate these laws. - Atoms of two or more elements may combine in different ratios to produce more
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