AP Chemistry Review

Front

What are the properties of gases that affect their behavior?

Back

Gases have low density, are compressible, and fill their containers. They exhibit properties such as pressure, volume, temperature, and number of moles, which are related by the ideal gas law.

Front

What is the ideal gas law?

Back

The ideal gas law is represented by the equation PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin.

Front

What is the difference between an acid and a conjugate base?

Back

An acid donates a proton (H+) in a reaction, while its conjugate base is what remains after the acid has donated the proton.

Front

What is ΔH in a chemical reaction?

Back

ΔH represents the change in enthalpy, or heat content, of a system during a reaction. A positive ΔH indicates an endothermic reaction, while a negative ΔH indicates an exothermic reaction.

Front

What is ΔS in a chemical reaction?

Back

ΔS represents the change in entropy, or disorder, of a system during a reaction. A positive ΔS indicates an increase in disorder, while a negative ΔS indicates a decrease in disorder.

Front

What are diatomic elements?

Back

Diatomic elements are molecules composed of two atoms, which can be of the same or different chemical elements. The diatomic elements are H2, N2, O2, F2, Cl2, Br2, and I2.

Front

What is bond length and what factors affect it?

Back

Bond length is the distance between the nuclei of two bonded atoms. It is affected by the size of the atoms and the number of bonds between them; shorter bonds are typically stronger.

Front

What is the significance of the term 'weak attractive forces' in gases?

Back

Weak attractive forces in gases allow particles to move freely and independently, resulting in low density and high compressibility.

Front

What is the role of heat in endothermic reactions?

Back

In endothermic reactions, heat is absorbed from the surroundings, leading to a positive ΔH and often a decrease in temperature of the surroundings.

Front

What is the relationship between pressure and volume in gases?

Back

According to Boyle's Law, at constant temperature, the pressure of a gas is inversely proportional to its volume (P1V1 = P2V2).