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 the formula to calculate the percentage by mass of an element in a compound?

Back

(mass of element in 1 mole of compound / molar mass of compound) × 100%.

Front

How do you determine the mass of a compound in a mixture given the percentage by mass?

Back

Multiply the total mass of the mixture by the percentage (as a decimal) of the compound.

Front

What is the formula for a carbonate compound formed with a metal X?

Back

The formula is XCO3, where X is the metal.

Front

What is a hydrate in chemistry?

Back

A hydrate is a compound that contains water molecules within its structure.

Front

How do you find the formula of a hydrate?

Back

Determine the mass of water lost upon heating, then use the molar mass of the anhydrous compound and water to find the ratio.

Front

What is ionization energy?

Back

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

Front

What is the trend of ionization energy in the periodic table?

Back

Ionization energy increases across a period and decreases down a group.

Front

What is the significance of the atomic number of an element?

Back

The atomic number represents the number of protons in the nucleus of an atom, determining the element's identity.