A mass spectrometer is an instrument that allows scientists to determinethe presence of elements in a given sample. As an environmental scientist, youhave analyzed some samples in a mass spectrometer and have found the presenceof elements. Now, you must organize and label some of the elements that youdiscovered in the samples. They are C, Po, Cr, Mg, and B. 2.In the table below, classifyeach element by the group (metal, nonmetal, or metalloid) it belongs to. Element Group C nonmetal Po metal Cr Mg B 3.A material chemist is tasked with coming up with a new material thatwill have specific, desired properties. A compound that she is working oncontains magnesium. A common approach to create a compound with enhanced,desired properties is to change one element in the material at a time. In thiscase, the material scientist will often try to change it with an element fromthe same Group in the periodic table. Forthis exercise, you will do the following: Complete the table below by labeling each element with itsappropriate Group (such as alkaline metal, noble gas, and alkaline earthmetals). Element Group Cobalt Barium Helium Scandium Tungsten Magnesium Aluminum Cesium Beryllium Iron Potassium Lithium a.Identify which group Magnesium belongs to.b.List the elements that the material scientist should try to replacemagnesium with if she wants to make a new material using another element of thesame Group. 4.Adapted from Exercise 30 in Ch. 5 of IntroductoryChemistry: Thelaw of constant composition states that the mass percentages of elements in acompound should stay proportional. This law allows a chemist to determine howmuch starting materials and products he can expect from a reaction. Imaginethat you are an inorganic chemist tasked with estimating the percentage amountsof iron and chlorine produced on the deposition of several samples of iron (III)chloride. Complete the following table: Sample Mass FeCl3 Mass Fe Mass Cl A 3.785 g 1.302 g 2.483 g B 2.175 g C 2.012 g D 2.329 g 5.Imagine that, as an environmental scientist, you are asked to write areport involving substances that you found in different soil and water samples.In the abstract and discussion sections of the report, you must provide thenames of the compounds. In the data section of the report, you are asked to usethe formulas of the compounds. You are also asked to provide their formulamasses. Provide the names of the compounds, the formulas of the compounds, andtheir associated formula mass in the following table: Compound Formula Formula mass Silver nitrate Potassium hydroxide Sodium sulfate Potassium hydrogensulfate Sodium hydrogencarbonate PtO2 PBr5 PbCO3
A mass spectrometer is an instrument that allows scientists to determine
the presence of elements in a given sample. As an environmental scientist, you
have analyzed some samples in a mass spectrometer and have found the presence
of elements. Now, you must organize and label some of the elements that you
discovered in the samples. They are C, Po, Cr, Mg, and B.
2.
In the table below, classify
each element by the group (metal, nonmetal, or metalloid) it belongs to.
Element
Group
C
nonmetal
Po
metal
Cr
Mg
B
3.
A material chemist is tasked with coming up with a new material that
will have specific, desired properties. A compound that she is working on
contains magnesium. A common approach to create a compound with enhanced,
desired properties is to change one element in the material at a time. In this
case, the material scientist will often try to change it with an element from
the same Group in the periodic table.
For
this exercise, you will do the following:
Complete the table below by labeling each element with its
appropriate Group (such as alkaline metal, noble gas, and alkaline earth
metals).
Element
Group
Cobalt
Barium
Helium
Scandium
Tungsten
Magnesium
Aluminum
Cesium
Beryllium
Iron
Potassium
Lithium
a.
Identify which group Magnesium belongs to.
b.
List the elements that the material scientist should try to replace
magnesium with if she wants to make a new material using another element of the
same Group.
4.
Adapted from Exercise 30 in Ch. 5 of Introductory
Chemistry:
The
law of constant composition states that the mass percentages of elements in a
compound should stay proportional. This law allows a chemist to determine how
much starting materials and products he can expect from a reaction.
Imagine
that you are an inorganic chemist tasked with estimating the percentage amounts
of iron and chlorine produced on the deposition of several samples of iron (III)
chloride. Complete the following table:
Sample
Mass FeCl3
Mass Fe
Mass Cl
A
3.785 g
1.302 g
2.483 g
B
2.175 g
C
2.012 g
D
2.329 g
5.
Imagine that, as an environmental scientist, you are asked to write a
report involving substances that you found in different soil and water samples.
In the abstract and discussion sections of the report, you must provide the
names of the compounds. In the data section of the report, you are asked to use
the formulas of the compounds. You are also asked to provide their formula
masses. Provide the names of the compounds, the formulas of the compounds, and
their associated formula mass in the following table:
Compound
Formula
Formula mass
Silver nitrate
Potassium hydroxide
Sodium sulfate
Potassium hydrogen
sulfate
Sodium hydrogen
carbonate
PtO2
PBr5
PbCO3
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