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Quiz: Dalton's Atomic Theory

1. Hydrogen combines with oxygen in a 1:8 weight ratio to form water. If every molecule of water contains two atoms of hydrogen and one atom of oxygen, an atom of oxygen must weigh: 1/8 times the mass of a hydrogen atom 8 times the mass of a hydrogen atom 16 times the mass of a hydrogen atom 1/16 times the mass of a hydrogen atom
2. 1.008 grams of hydrogen combines with 35.453 g of chlorine to form 36.463 g of a pure compound (hydrogen chloride). Dalton's explanation for this experimental fact might be: chlorine accepts hydrogen's electron to form polar covalent hydrogen chloride one atom of hydrogen combines with 35.453 atoms of chlorine in this reaction hydrogen and chlorine atoms aren't created or destroyed in the process so the reactant mass is the same as the product mass. hydrogen and chlorine atoms always combine in a 1:35 ratio. this is a simple mixture of elements because the ratio isn't a whole number ratio
3. Which of the following is not a postulate of Dalton's atomic theory? atoms are not created or destroyed in chemical change different elements have atoms of different masses atoms of a single element can have different masses atoms combine in simple whole number ratios to form compounds chemical change is a rearrangement of atoms
4. Dalton said that elements are different distinguished from each other by: the shapes of their atoms the density of their solid forms the weights of their atoms the charge on their ions
5. When elements react, their atoms combine in: pairs simple whole number ratios (more than one possible) triplets 1:1 ratios arbitrary proportions a simple whole number ratio (unique for each pair of elements)

 Dalton's Atomic Theory Page 1: Introduction Page 2: Dalton's assumptions Five steps forward and one step back. Page 3: Atoms in compounds An "invisible hand" fixes atom ratios in compounds Page 4: Atoms in reactions Dance of the atoms Page 5: Learning check Take a quiz on Dalton's Atomic Theory Page 6: References and resources

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