CHEM134 C002 SPRING DIGITAL
COLLIGATIVE PROPERTIES BEYOND LABZ
REVIEW QUESTION SET WITH ACCURATE
ANSWERS
◉ what is group 7A called?
Answer: Halogens
◉ charges of groups 1A-3A are
Answer: positively charged and equal to the charge of their group
number
◉ groups 5A to 8A have what kind of charges and how are they
calculated
Answer: make negative ions and charge is group number minus 8
◉ how are halogens written?
Answer: (element)2 (always two of them)
◉ cation charge
Answer: The charge of a cation from the representative elements
is the same as the family number. (positive)
,◉ anion charge
Answer: group number - 8 (negative charge)
◉ do atoms of diff elements have the same mass?
Answer: no they are diff
◉ what is amu
Answer: atomic mass unit
◉ when is amu used?
Answer: when dealing small masses like masses of atoms or
molecules.
◉ what do most elements occur in nature as?
Answer: a mixture of isotopes
◉ what is the amu of 16 oxygen isotope?
Answer: 16 exact, and avg is 15.9949
◉ whats mass spectrometry?
Answer: when you find the avg atomic mass of elements using the
masses of various isotopes multiplies by their related abundance
(%)
, ◉ what is the equation to find avg atomic mass?
Answer: avg atomic mass= sigma (fractional abundance * mass of
isotopes)
◉ what is the exact mass of pure isotope 12 C
Answer: 12amu
◉ in what units if avg atomic mass expressed in?
Answer: amu
◉ is atomic weight (AW listed in the periodic table)?
Answer: yes atomic weight is the atomic mass
◉ what is formula weight (FW)?
Answer: the sum of the atomic weights (AW) of the SEPERATE
ATOMS in the chemical formula of the substance, usually stated in
amu (atomic mass units)
usually refers to ionic substances
◉ how would you find FW for H2S04?
Answer: (2*1.04amu)+(32.1amu)+(4*16.0amu)=98.1amu
◉ what is a mole?
COLLIGATIVE PROPERTIES BEYOND LABZ
REVIEW QUESTION SET WITH ACCURATE
ANSWERS
◉ what is group 7A called?
Answer: Halogens
◉ charges of groups 1A-3A are
Answer: positively charged and equal to the charge of their group
number
◉ groups 5A to 8A have what kind of charges and how are they
calculated
Answer: make negative ions and charge is group number minus 8
◉ how are halogens written?
Answer: (element)2 (always two of them)
◉ cation charge
Answer: The charge of a cation from the representative elements
is the same as the family number. (positive)
,◉ anion charge
Answer: group number - 8 (negative charge)
◉ do atoms of diff elements have the same mass?
Answer: no they are diff
◉ what is amu
Answer: atomic mass unit
◉ when is amu used?
Answer: when dealing small masses like masses of atoms or
molecules.
◉ what do most elements occur in nature as?
Answer: a mixture of isotopes
◉ what is the amu of 16 oxygen isotope?
Answer: 16 exact, and avg is 15.9949
◉ whats mass spectrometry?
Answer: when you find the avg atomic mass of elements using the
masses of various isotopes multiplies by their related abundance
(%)
, ◉ what is the equation to find avg atomic mass?
Answer: avg atomic mass= sigma (fractional abundance * mass of
isotopes)
◉ what is the exact mass of pure isotope 12 C
Answer: 12amu
◉ in what units if avg atomic mass expressed in?
Answer: amu
◉ is atomic weight (AW listed in the periodic table)?
Answer: yes atomic weight is the atomic mass
◉ what is formula weight (FW)?
Answer: the sum of the atomic weights (AW) of the SEPERATE
ATOMS in the chemical formula of the substance, usually stated in
amu (atomic mass units)
usually refers to ionic substances
◉ how would you find FW for H2S04?
Answer: (2*1.04amu)+(32.1amu)+(4*16.0amu)=98.1amu
◉ what is a mole?
