AP Chemistry Unit 1 Practice

Front

What is the balanced chemical equation for the formation of ammonia from nitrogen and hydrogen?

Back

N2(g) + 3H2(g) → 2NH3(g)

Front

How do you calculate the mass of a product formed in a chemical reaction?

Back

Use stoichiometry: Convert grams of reactant to moles, use the mole ratio from the balanced equation, then convert moles of product back to grams.

Front

What is ionization energy?

Back

The energy required to remove an electron from an atom in the gas phase.

Front

What trend in ionization energy is observed across a period in the periodic table?

Back

Ionization energy generally increases across a period due to increasing nuclear charge.

Front

What is the photoelectron spectrum?

Back

A graph that shows the number of electrons ejected from an atom as a function of their binding energy.

Front

What does the height of a peak in a photoelectron spectrum represent?

Back

The height indicates the relative number of electrons in that energy level.

Front

What is a hydrate?

Back

A compound that contains water molecules within its crystal structure.

Front

How do you determine the formula of a hydrate?

Back

Calculate the mass of water lost upon heating, then use molar masses to find the ratio of salt to water.

Front

What is the mole ratio in a compound?

Back

The ratio of the number of moles of one element to the number of moles of another element in a compound.

Front

How do you calculate the mole ratio from a chemical formula?

Back

Identify the subscripts in the formula; they represent the number of moles of each element.