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Science, Mathematics, Chemistry
11th -
12thgrade
Chapter 5: Chemical Quantities
15 questions
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- 1. Multiple Choice
In determining atomic mass units, the standard is the
carbon-12 atom.
hydrogen-1 atom.
carbon-14 atom.
oxygen-16 atom.
- 2. Multiple Choice
The atomic mass unit is used to express
atomic mass.
atomic number.
atomic mass number.
molar mass.
- 3. Multiple Choice
The unit g/mol is the unit of
atomic mass.
atomic number.
molar mass.
atomic mass number.
- 4. Multiple Choice
The number of atoms in a mole of any element is called
its atomic number.
the molar mass number.
Avogadro’s number.
the gram-atomic number.
- 5. Multiple Choice
Using a periodic table, find the identity of the element that has an atomic mass of 40.078 amu.
C
Ca
Cr
Cu
- 6. Multiple Choice
Using a periodic table, determine which of the following quantities is not equal to 1.00 mole.
6.02 x 10^23 carbon atoms
79.9 g Br
26.0 g Fe
65.4 g Zn
- 7. Multiple Choice
Avogadro’s number is
6.022 x 10^23
3.1416
1.602 x 10^-24
3.0 x 10^-8
- 8. Multiple Choice
The molar mass of an element is numerically equal to the
element’s atomic mass.
number of neutrons found in the element.
element’s atomic number.
mass of one atom of the element.
- 9. Multiple Choice
What is the molar volume of a gas at standard temperature and pressure (STP)?
1.0 atm/mol
22.4 L/mol
1.0 L/22.4 mol
22.4 atm/mol
- 10. Multiple Choice
_____ gives the actual number of atoms in the structure of the molecule, as opposed to just the ratio.
empirical formula
density
molecular formula
percent composition
- 11. Multiple Choice
The _____ of a compound gives the lowest whole-number ratio of the atoms or moles of elements in a compound.
density
percent composition
molecular formula
empirical formula
- 12. Multiple Choice
The ____ states that any sample of a compound will be made up of the same elements in the same ratio.
percent composition
law of constant composition
law of definite proportions
density
- 13. Multiple Choice
_____ is the percent by mass of each element in the compound.
law of definite proportions
law of constant composition
density
percent composition
- 14. Multiple Choice
_____ is the ratio of the mass of a substance to its volume.
Mole
Density
Molar mass
Percent composition
- 15. Multiple Choice
The term _____ refers to the species present in a substance, usually atoms, molecules, or formula units.
representative particle
Avogadro's number
mole
molar mass
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