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Law of multiple proportions

Law of multiple proportions. Different compounds can be composed of the same elemenets . This happens when different compounds containing the same elements have different mass compositions. Ex: CuCl and CuCl 2 FeO and Fe 2 O 3 H 2 O and H 2 O 2. The Law of Multiple Proportions.

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Law of multiple proportions

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  1. Law of multiple proportions

  2. Different compounds can be composed of the same elemenets. • This happens when different compounds containing the same elements have different mass compositions. • Ex: • CuCland CuCl2 • FeO and Fe2O3 • H2O and H2O2

  3. The Law of Multiple Proportions • The Law of Multiple Proportions states that when different compounds are formed by a combination of the same elements, different masses of one element combine with the same relative mass of the other element in a ratio of small whole numbers. • HUH?!

  4. Let’s look at water and hydrogen peroxide • Water (H2O) and hydrogen peroxide (H2O2) are composed of the same elements. • We can compare the mass of oxygen in hydrogen peroxide to the mass of oxygen in water. • The ratio is 2:1… which means, simply, that H2O2 has 2 times the amount of oxygen than H2O.

  5. How about comparing compounds of copper and chlorine • Copper can combine with chlorine in two different compounds, depending upon conditions under which the reaction took place.

  6. We can divide the mass ratio of compound I by the mass ratio of compound II to find the ratio between the compounds.

  7. This means that the mass ratio of copper to chlorine in compound 1 is exactly 2 times the mass ratio of copper to chlorine in compound 2

  8. Reminders • HW due Monday (% comp) • No Mid-Term • We will be doing a couple of labs next week, starting TUESDAY. Remember to wear APPROPRIATE CLOTHING! Otherwise it is a zero! • There may be use of burners and chemicals that could cause injury if not used properly. Remember, it is your responsibility to work safely in the laboratory!

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