AP Chem Semester 1 Exam Practice

Front

What is the ground state electron configuration of Cobalt?

Back

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷

Front

Which element has the most negative electron affinity among Cl, P, Mg, Na, and K?

Back

Cl (Chlorine) has the most negative electron affinity.

Front

What does the law of constant composition state?

Back

The law of constant composition states that a chemical compound always contains its component elements in fixed ratio by mass.

Front

How do you calculate the mass of NaN₃ required to provide a specific volume of N₂ at given conditions?

Back

Use the ideal gas law (PV=nRT) to find moles of N₂, then convert moles to grams using the molar mass of NaN₃.

Front

What is the reaction of Calcium carbide (CaC₂) with water?

Back

CaC₂ (s) + 2H₂O (g) → Ca(OH)₂ (s) + C₂H₂ (g) produces acetylene.

Front

What is the molar mass of NaN₃?

Back

The molar mass of NaN₃ (Sodium azide) is approximately 65.01 g/mol.

Front

What is electron affinity?

Back

Electron affinity is the amount of energy released when an electron is added to a neutral atom to form a negative ion.

Front

What is the significance of the 27% carbon and 73% oxygen composition in carbon dioxide?

Back

It illustrates the law of constant composition, showing that carbon dioxide always has this fixed ratio.

Front

How do you determine the mass of water required in a chemical reaction?

Back

Use stoichiometry based on the balanced chemical equation and the molar masses of the reactants.

Front

What is the ideal gas law equation?

Back

PV = nRT, where P is pressure, V is volume, n is number of moles, R is the gas constant, and T is temperature.