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WorksheetsLaw of mass proportion
Total questions: 16
Worksheet time: 9mins
The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:
definite proportion
Conservation of mass
Multiple proportions
Reciprocal proportions
The nucleus of an atom contains which subatomic particles?
protons and electrons
protons and neutrons
electrons and neutrons
protons, electrons, and neutrons
Typically in an atom, which two subatomic particles are equal in number?
protons and neutrons
all subatomic particles are equal in number
neutrons and electrons
protons and electrons
The law of definite proportions states that a given chemical compound always contains the same _ in the exact same _ by mass.
elements, compounds
elements, molecules
elements, proportions
proportions, elements
Carbon 's mass is _.
6
12.01
+/- 4
2
Oxygen's mass is _.
8
16
-2
2
The mass of the compound CO2 is _.
16
28.01
44.01
56.02
The percent by mass of carbon to oxygen in CO2 is _.
100%
33.3%
72.7%
27.3%
The mass of an unknown element would be _ if the percentage of it in a 44.01 g compound was 27.29%.
1.613 g
12.01 g
62.01 g
72.71%
