Question 1
The observation that hydrogen and oxygen can react to form two compounds with different chemical and physical properties, one having an O:H mass ratio = 8:1 and the other having an O:H mass ratio = 16:1 is consistent with the law of
◦ energy conservation.
◦ definite proportions.
◦ multiple proportions.
◦ mass conservation.
Question 2
Which of the following statements is
not a postulate of Dalton's atomic theory?
◦ Each element is characterized by the mass of its atoms.
◦ Elements are composed of atoms.
◦ Atoms are composed of protons, neutrons, and electrons.
◦ Chemical reactions only rearrange atomic combinations.