Chemistry B Semester Exam Practice Flashcard

Front

What determines the mass number of an isotope?

Back

The mass number of an isotope is determined by the total number of protons and neutrons in the nucleus.

Front

How is enthalpy measured?

Back

Enthalpy is measured by calculating the enthalpy change experienced in a system.

Front

What happens to gas pressure when the number of gas particles increases?

Back

The more gas particles there are in a container, the more collisions occur, resulting in higher pressure.

Front

What is the conversion factor for moles of a gas to volume at STP?

Back

1 mole of gas occupies 22.4 L at STP.

Front

What variables are included in the Ideal Gas Law?

Back

The Ideal Gas Law includes pressure, volume, temperature, and number of moles.

Front

Define an isotope.

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.

Front

What is the formula for calculating enthalpy change?

Back

Enthalpy change (ΔH) = H(final) - H(initial).

Front

Explain the relationship between pressure and volume in gases (Boyle's Law).

Back

Boyle's Law states that at constant temperature, the pressure of a gas is inversely proportional to its volume.

Front

What is STP in chemistry?

Back

STP stands for Standard Temperature and Pressure, defined as 0 degrees Celsius (273.15 K) and 1 atmosphere pressure.

Front

What is the molar volume of an ideal gas at STP?

Back

The molar volume of an ideal gas at STP is 22.4 liters.