What happens to the freezing temperature of a salt water solution as it becomes more concentrated?
A) As salt water becomes more concentrated, the temperature at which it freezes become lower because fewer water molecules of the liquid phase in contact with the ice.
B) As salt water becomes more concentrated, the temperature at which it freezes become higher because salt ions help to hold together the ice.
C) As salt water becomes more concentrated, the temperature at which it freezes does not change.
D) As salt water becomes more concentrated, the temperature at which it freezes become higher because the molecules are moving faster as they interact with the salt ions.
Question 2
The element bromine, Br (atomic number 35), has two major isotopes of similar abundance, both around 50 percent.
The atomic mass of bromine is reported in the periodic table as 79.904 atomic mass units. Choose the most likely set of mass numbers for these two bromine isotopes.
A) Br-80, Br-81
B) Br-79, Br-80
C) Br-79, Br-81
D) Br-78, Br-80
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