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Ch.2 - Atoms & Elements

Chapter 2, Problem 39

Which statements are consistent with Dalton's atomic theory as it was originally stated? Why? a. Sulfur and oxygen atoms have the same mass. b. All cobalt atoms are identical. c. Potassium and chlorine atoms combine in a 1:1 ratio to form potassium chloride. d. Lead atoms can be converted into gold.

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Hey everyone in this question, we need to identify the statement that follows Dalton's atomic theory and explain why Statement A. is stating that water is formed when hydrogen oxygen combined in a 1-2. ratio. We want to recall that atoms combine in whole number ratios. And so we would say that therefore this is an inconsistent statement to Dalton's theory. And so we would rule out choice A choice B states that copper can be made from iron atoms. We want to recall that you can't do stuff like this, you can't make atoms of one element from another. And so therefore this is inconsistent with Dalton's atomic theory. So we can rule out Choice B. Moving to statement, see it says that all atoms of zinc have the same mass and properties. And so we would recall that no matter how many atoms of zinc we have in a molecule. This statement is going to be consistent with Dalton's theory because atoms of a given element have the same mass and properties. So this is exactly from Dalton's atomic theory and we would agree with choice C. So we can definitely say it's consistent. Moving onto Choice D. We have carbon and nitrogen atoms have different physical properties but have identical chemical properties. And this statement totally contradicts statements. See statement C. Is consistent with Dalton's theory. Then, statement D. Is definitely going to be inconsistent again, atoms of an of a given element have the same mass and other properties. And so we would rule out choice D. So the only correct choice to complete this example is Choice C. All atoms of a given element, like zinc will have the same mass and other similar properties. So this is in line with Dalton's atomic theory, and this will complete this example as our final answer. If you have any questions, please leave them down below, and I will see everyone in the next practice video.
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Palladium forms three different compounds with sulfur. The mass of sulfur per gram of palladium in each compound is listed here. Show that these masses are consistent with the law of multiple proportions. Compound Grams S per Gram Pd A 0.603 B 0.301 C 0.151

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Textbook Question

Sulfur and oxygen form both sulfur dioxide and sulfur trioxide. When samples of these are decomposed, the sulfur dioxide produces 3.49 g oxygen and 3.50 g sulfur, while the sulfur trioxide produces 6.75 g oxygen and 4.50 g sulfur. Calculate the mass of oxygen per gram of sulfur for each sample and show that these results are consistent with the law of multiple proportions.

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Which statements are consistent with Rutherford's nuclear theory as it was originally stated? Why? a. The volume of an atom is mostly empty space. b. The nucleus of an atom is small compared to the size of the atom. c. Neutral lithium atoms contain more neutrons than protons. d. Neutral lithium atoms contain more protons than electrons.

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Which statements are inconsistent with Rutherford's nuclear theory as it was originally stated? Why? a. Since electrons are smaller than protons, and since a hydrogen atom contains only one proton and one electron, it must follow that the volume of a hydrogen atom is mostly due to the proton. b. A nitrogen atom has 7 protons in its nucleus and 7 electrons outside of its nucleus. c. A phosphorus atom has 15 protons in its nucleus and 150 electrons outside of its nucleus. d. The majority of the mass of a fluorine atom is due to its 9 electrons.

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