The Heart of the Matter
This is calculated by adding the atomic masses of all the atoms in a compound.
What is molar mass?
The relative height of each peak on a photoelectron spectrum is proportional to this.
What is the number of electrons in each subshell?
This law states the ratio of the masses of constituent elements in any pure sample of that compound is always the same.
What is the law of definite proportions?
The net positive charge experienced by the nucleus of an atom.
What is effective nuclear charge?
In order to fill the 3d orbital, this orbital must be filled first.
What is the 4s orbital?
There are this many molecules in 45.0 grams of CH4.
What is 1.69 x 1024 molecules
The mass spectra of a sample containing a single element can be used to determine these two things.
What is:
1. the identity of the isotopes of that element
2. the relative abundance of each isotope in nature
This formula represents the simplest number ratio of elements in a compound.
What is an empirical formula?
This trend increases across a period from left to right, and up a group on the periodic table.
What is electronegativity?
True or False:
Electrons in 1s would have a lower binding energy than the electrons in 2s.
False.
A salt shaker containing 9.58 x 1023 formula units of NaCl contains this many moles of NaCl.
What is 1.59 mol NaCl
In photoelectron spectrum graphs, peaks farther to the left indicate electrons with this characteristic.
What is higher binding/ionization energy?
A compound that has an empirical formula of CH2 and a molar mass of 84 g/mol has this molecular formula.
What is C6H12?
The energy required to remove an electron from an atom.
What is ionization energy?
This is the shorthand/noble gas electron configuration of Zn.
What is [Ar] 4s23d10?
This is the molar mass of Aspartame (C14H18N2O5)
What is 294.31 g/mol
The element shown in this photoelectron spectrum (see board)
What is Aluminum?
A compound has a molecular mass of 183 g/mol and is 59% C, 7.1% H, 26.2% O, and 7.7% N by mass. This is the empirical and molecular formula.
What is C9H13O3N?
Explain why the atomic radii of Li is smaller than Na.
The valence electron for Li is closer to the nucleus than the valence electron for Na.
This is the electron configuration of Al 3+?
What is 1s22s22p6?
There are this many atoms of Nitrogen in 1.25 g of Aspartame (C14H18N2O5)
What is 5.12 x 1021 atoms of N?
The element shown in this mass spec (see board)
What is Oxygen?
A hydrate of magnesium sulfate has a mass of 13.52 g. The sample is heated until no more water remains. The MgSO4 anhydrate has a mass of 6.60 g. This is the formula of the hydrate.
What is MgSO4 * 7 H2O?
The second ionized electron comes a core subshell rather than a valence subshell.
Helium has a higher charge magnitude, which created a stronger attractive force, making He electrons harder to remove.