Water (Hâ‚‚O) from different sources (river, rain, laboratory) all contain hydrogen and oxygen in the same ratio. What is this mass ratio of H to O in water?
A.
H : O = 1 : 16 by mass
B.
H : O = 1 : 8 by mass (2 g of H for every 16 g of O)
What is the correct statement of the Law of Multiple Proportions?
A.
The masses of elements in any compound bear a ratio of small integers to their atomic masses
B.
When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other element bear a simple whole number ratio to each other
C.
When two elements combine, they always form only one compound with a fixed ratio
D.
Two elements always combine in a 1:1 molar ratio to form all their compounds
B. When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other element bear a simple whole number ratio to each other
12.
The Law of Multiple Proportions is best illustrated by which example?
A.
Carbon and oxygen form two compounds: CO (12 g C with 16 g O) and COâ‚‚ (12 g C with 32 g O); ratio of O masses = 16:32 = 1:2
B.
The mass of products always equals the mass of reactants
C.
Hâ‚‚O always contains H and O in a ratio of 1:8 by mass
D.
Equal volumes of Hâ‚‚ and Oâ‚‚ contain different numbers of molecules
