AP Chemistry - Unit 1 Review

Front

What is the average atomic mass of an element?

Back

The average atomic mass is the weighted average of the masses of an element's isotopes, measured in atomic mass units (amu).

Front

How do you determine the identity of an element using mass spectrum?

Back

By analyzing the mass spectrum, you can identify the element based on its average atomic mass and compare it to known values.

Front

What is percent composition in chemistry?

Back

Percent composition is the percentage by mass of each element in a compound.

Front

True or False: Compounds with different molecular formulas can have the same percent composition.

Back

True. Different compounds can have the same percent composition of elements.

Front

What is an empirical formula?

Back

An empirical formula represents the simplest whole-number ratio of atoms of each element in a compound.

Front

How do you calculate the empirical formula from percent composition?

Back

Convert the percent composition to grams, then to moles, and find the simplest ratio of moles of each element.

Front

What is the electron configuration of an element?

Back

The electron configuration describes the distribution of electrons in an atom's orbitals.

Front

How do you determine the electron configuration for transition metals?

Back

For transition metals, fill the 3d subshell after the 4s subshell, following the Aufbau principle.

Front

What is the formula to calculate percent composition?

Back

Percent composition = (mass of element in 1 mole of compound / molar mass of compound) x 100%.

Front

How do you find the molar mass of a compound?

Back

Add the atomic masses of all atoms in the compound's formula.