Spectra and Experimental Methods
the strong acid or base in the burette used to determine the concentration or K of the unknown is called__________
the titrant
sometimes multiple lewis structures are required to represent one molecule. These additional structures are called:
resonance structures
What's the charge on PO4?
3-
Which of the following elements has the largest atomic radius?
Na, Sr, I, F, Cs
Cs
a material that does not conduct electricity as a solid, but does as a liquid or when dissolved in water
ionic solid
In Beer-Lambert law (A=ebC), b represents the pathlength through the sample holder, called a __________.
cuvette
what is the bond angle in tetrahedral geometry?
109.5
Name the SCN- ion
thiocyanate
Which of the following has the highest electron affinity?
Kr, Rb+, Rb, Br-, Br
Br
types of bonds between atoms in a metallic solid
non-directional covalent
Write the electron configuration for this PES
1s22s22p63s23p1
What is the oxidation number of manganese in KMnO4?
+7
name HClO4
perchloric acid
Which of the following has the greatest effective nuclear charge?
Na, Na+, Cl, or Cl-
Cl (more protons, same amount of shielding across the period)
type of alloy that changes a pure metal's properties from soft and malleable to hard and strong
interstitial alloy
What is the element run in this mass spec?
Germanium
Draw the Lewis structure and identify the geometry of IF3
T-shaped (trigonal bipyramidal, but I has two lone pairs 120 degrees away from each other)
write the formula for silver (I) chromate
Ag2CrO4
Which group of elements can be predicted to have the lowest second ionization energy?
Group II
two types of solids with high melting points
atomic network solid and ionic solids
What kind of spectra is this and what causes the peaks to occur?
IR, vibrations in intramolecular stretching of bonds
Draw the Lewis structure and identify the geometry of XeF4
Square planar (a version of octahedral geometry)
Name HNO2
Nitrous acid
Below are the data for ionization energies of three elements X, Y, and Z. These elements are on the third peroid of the periodic table. The first four ionization energies for elements X, Y, and Z are given below in values of kJ/mol.
Figure 1: Ionization energies in kJ/mol for selected elements
What is element Z? F, Na, Ne, Mg, or Al
Mg
Ar(s) is a Group VIIIa atomic solid. What holds the atoms together?
London Dispersion Forces