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Chemistry
12th
grade
Isotope, Atomic & Molecular Masses, and Inorganic Compounds
20 questions
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- 1. Multiple Choice
What can be found in the nucleus of an atom?
electrons only
neutrons and protons
protons only
neutrons and electrons
- 2. Multiple Choice
Isotopes of an element have different number of ...
protons
electrons
neutrons
mass
- 3. Multiple Choice
In a correctly written symbol what would be located in the "A" position?
number of neutrons
number of electrons
atomic number
mass number
- 4. Multiple Choice
Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses.
protons, neutrons
protons, electrons
neutrons, protons
electrons, protons
- 5. Multiple Choice
An atom's atomic number is equal to ...
the number of protons in the atomic nucleus
the number of electrons in the atom
the number of neutrons in the atom's nucleus
the total of protons + neutrons
- 6. Multiple Choice
What does it change in an ion?
the number of electrons
the number of neutrons
the number of protons
the number of megatrons
- 7. Multiple Choice
What charge does an atom have when it GAINS electrons?
positive
negative
neutral
unidentified
- 8. Multiple Choice
Based on the isotope notation, what happen to the Mg element?
It loses electrons
It gains protons
It gains electrons
It loses protons
- 9. Multiple Choice
How many protons does this isotope of titanium have?
48
22
26
70
- 10. Multiple Choice
How many neutrons does the isotope of lithium have?
8
3
5
11
- 11. Multiple Choice
How many electrons does a Copper atom have?
63
29
92
34
- 12. Multiple Choice
The relative atomic mass is the average mass of an atom compared to
the mass of a carbon-12 atom
the mass of a hydrogen atom
1/12 the mass of a carbon-12 atom
1/12 the mass of a hydrogen atom
- 13. Multiple Choice
The relative molecular mass of a compound is equal to the sum of its
atomic mass
atomic number
oxidation number
valence electrons
- 14. Multiple Choice
What is the relative molecular mass of fluorine gas, F2?
19
9
38
18
- 15. Multiple Choice
What is the unit of relative molecular mass?
gram
atomic mass unit
gram per mole (g mol-1)
no unit
- 16. Multiple Choice
The formula of a compound is M(OH)2. Given that the Mr of the compound is 98, calculate the Ar of M.
34
81
64
94
- 17. Fill in the Blank
Calculate the relative formula mass of aluminium sulphate, Al2(SO4)3.
[Give your answer up to 1 decimal point.]
[[Extra Note: Relative FORMULA mass is used in this question instead of relative molecular mass because the given compound is an ionic compound (metal ion & non-metal ion)]]
- 18. Multiple Choice
What is the correct name for Al(NO3)3?
Aluminum nitrate
Aluminum nitrite
Aluminum(III) nitrate
Aluminum nitrogen trioxide
- 19. Multiple Choice
What is the correct formula of phosphorus trichloride?
P2Cl3
PCl3
P3Cl3
PCl5
- 20. Multiple Choice
What is the correct formula of lithium perchlorate?
None of these.
LiCl
LiClO
Li2ClO4
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