In what way was Dalton’s atomic theory more scientific than that of the
Greek philosopher?
A. Dalton’s atomic theory consists of postulates
B. Dalton viewed atoms based on philosophical explanations.
C. Dalton investigated the atom’s structure using sophisticated
instruments.
D. Dalton’s atomic theory was based on empirical laws of chemical
combinations.
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Which of the following observations illustrates the law of conservation of
mass?
A. A flashbulb contains magnesium and oxygen before use and
magnesium oxide after use. Its mass does not change.
B. A sample of slat obtained from seawater contains the same
percentage of components like the salt being sold in the market.
C. Sulfur powder and gas combine chemically to form two compounds.
One of the compounds contains 50% sulfur and 50% oxygen. The other
compound contains 40% sulfur and 60% oxygen.
D. A separate analysis of two different compounds consisting of copper
and oxygen showed that one of the compounds contains a greater
percentage of copper than the other.