Moles and Molar Mass
The mass of one mole of a substance as expressed as g/mol.
What is molar mass?
This is the mathematical operation used to find the average atomic mass of an element using the mass and relative abundance of all its stable isotopes.
What is a weighted average?
Unlike most graphs in math class, the x-axis of a PES spectrum is unique because it is usually plotted with the values increasing in this direction.
What is from right to left?
This is the formula used to calculate the mass percent of an element in a compound.
What is ((total mass)/(molar mass))*100?
As you move from left to right across a period, this trend occurs in the atomic radius due to an increase in the number of protons.
What is decreasing?
A standard scientific unit representing 6.022*10^23 particles.
What is a mole?
On the mass spectrum, the peak is directly proportional to this property of an isotope.
What is percent abundance?
The x-axis on a PES spectrum typically measures this value, which represents the energy required to remove an electron from a specific subshell.
What is binding energy?
In a 100g sample of NaCl, the mass of sodium will be the same as in a 500g sample of NaCl because of this chemical law.
What is the Law of Definite Proportions?
The ability of the atom to attract electrons when the atom is in a compound.
What is electronegativity?
The volume of gas at 298K and 1 atm.
What is 24L?
To calculate the average atomic mass, you must multiply the mass of each isotope by this decimal form of its abundance before summing them.
What is fractional abundance?
On a PES spectrum, the relative height of a peak is directly proportional to this.
What is the number of electrons in that subshell?
To find the mass of iron in a 200g sample of pure Fe2O3, you would multiply 200g by this specific ratio.
What is the mass ratio?
Values decrease from top to bottom within a group and the values tend to increase from left to right across a period.
What are electronegativity trends?
A law that states that all gases at the same temperature and pressure contain the same number of molecules.
What is Avogadro's law?
In a sample of pure Neon, a mass spectrum reveals three peaks. Despite the sample being "pure," the presence of three peaks proves the existence of these.
What are isotopes?
For any given neutral atom, the peak located furthest to the left always represents electrons in this specific subshell.
What is the 1s subshell?
If a student heats a hydrate and the mass decreases, the mass lost represents this specific part of the original mixture.
What is the water of hydration?
This is the primary reason atomic radius increases as you move down a group on the Periodic Table.
What is the addition of energy levels?
This biatomic element has a molar mass of 15.999.
What is O2
An element has two isotopes: X-10 (20% abundance) and X-11 (80% abundance). This is the calculated average atomic mass of the element.
What is 10.8amu?
PES is based on the Photoelectric Effect; the energy of the incoming photon is equal to the sum of the binding energy and this other form of energy of the ejected electron.
What is kinetic energy?
A 10.0g sample of an impure metal carbonate is heated, releasing 2.2g of CO2. If the pure carbonate is 44% CO2 by mass, this is the mass of the pure carbonate in the original sample.
What is 5.0g?
The reason why atomic radius decreases across a period despite having more particles.
What is a higher nuclear charge?