Exam 2 Review CHEM-CP

Wavelength, Frequency, and Energy

100

As frequency increases, this wave property decreases

What is wavelength?

200

This unit measures frequency and is equal to “per second”

What is hertz (Hz)?

300

Among visible light, this color has the highest energy due to its short wavelength

What is violet?

400

This equation relates all three wave quantities: speed of light, wavelength, and frequency

c = (lambda)v

500

Using E =hv, calculate the energy of a photon with a wavelength of 400nm

What is 4.97E-19 J?

Atomic Spectra

100

These lines appear when electrons fall from higher energy levels to lower ones

What are emission lines?

200

This model explains that electrons can only exist in specific energy levels around the nucleus

What is the Bohr model?

300

This type of spectrum shows dark lines where light of certain wavelengths has been absorbed

What is absorption spectrum?

400

This equation relates the energy change of an electron to the frequency of the light emitted or absorbed

What is E = hv

500

The bright-line spectrum of an element is created when electrons do this between energy levels

What is fall from higher to lower energy levels?

Electron Configuration

100

This rule says electrons fill the lowest-energy sub levels first

What is the Aufbau Principle?

200

This principle states that no two electrons in the same orbital can have the same set of quantum numbers

What is the Pauli Exclusion Principle?

300

This rule says electrons must fill each orbital singly before pairing up

What is Hund’s Rule?

400

The electron configuration for oxygen ends with this sublevel

What is 2p^4?

500

Elements in the same group of the periodic table have this feature in common in their electron configurations

What are the same number of valence electrons?

Empirical and Molecular Formulas

100

This is the simplest whole-number ratio of atoms in a compound

What is an empirical formula?

200

This formula shows the actual number of each type of atom in one molecule

What is a molecular formula?

300

To determine an empirical formula, you must first convert grams of each element into this

What are moles?

400

A compound has an empirical formula of CH2 and a molar mass of 56 g/mol. Its molecular formula is this. (Hint: empirical molar mass = 14 g/mol)

What is C4H8?

500

A compound contains 40% C, 6.7% H, and 53.3% O by mass. Its empirical formula is this

What is CH2O?

Percent Composition and Mole-Mole Ratio

100

This term describes the percent by mass of each element in a compound

What is percent composition?

200

To find percent composition, you divide the mass of the element by this quantity 

What is the molar mass of the compound?

300

To convert atoms to moles, you divide by this number

What is avagadros number?

400

The number of atoms in 2.00 moles of carbon is this 

What is 1.20E24 atoms?

500

A compound has a molar mass of 100 g/mol and contains 40g of carbon. The percent composition of carbon is this

What is 40%?