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- 1. Multiple Choice
1 Which of the following number of subatomic particles of carbon atom is correct?
6 protons and 6 neutrons
12 protons and 6 neutrons
6 protons and 12 neutrons
12 protons and 12 neutrons
- 2. Multiple Choice
Which of the following information are obtained directly from a mass spectrum?
I Number of isotopes present
II Molar mass of the isotopes
III Molecular formula of a compound
IV Percentage abundances of isotopes
I and II
II and III
III and IV
I and V
- 3. Multiple Choice
In an experiment, a compound was found to contain 15% of hydrogen and 85% of carbon by mass. What is the empirical formula of this compound?
CH2
CH4
C2H4
C4H10
- 4. Multiple Choice
What is the mass of 3.35 moles of sulfur trioxide
335 g
268 g
245 g
125 g
- 5. Multiple Choice
A subatomic particle that has a negative charge is called a(n)
proton
neutron
electron
nucleus
- 6. Multiple Choice
An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?
30
26
56
82
- 7. Multiple Choice
An atom’s mass number equals the number of
protons plus the number of electrons.
proton plus the number of neutron
protons
electrons
- 8. Multiple Choice
A sample of element X contains 90% X-35 atoms,
8.0% X-37 atoms, and 2.0% X-38 atoms. The
average atomic mass will be closest to which
value?
35
37
36
38
- 9. Multiple Choice
The atomic mass of an element is defined as the weighted average mass of that element’s
naturally occurring isotopes
least abundant isotope
radioactive isotopes
most abundant isotope
- 10. Multiple Choice
What is the total number of electrons in an Mg2+ ion?
2
10
12
24
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