Midterm Exam Practice

Front

What are the two phases of a compound represented in particle diagrams?

Back

The two phases of a compound can be represented by different particle diagrams, such as solid and gas phases.

Front

What is the balanced chemical equation for the reaction of magnesium and nitrogen?

Back

3Mg(s) + N₂(g) → Mg₃N₂(s)

Front

How do alkali metals compare to halogens in terms of electrical conductivity at STP?

Back

Alkali metals have higher electrical conductivity than halogens at STP.

Front

What is the relationship between volume, pressure, and temperature for gases?

Back

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

Front

What is the significance of STP in gas calculations?

Back

STP (Standard Temperature and Pressure) is defined as 0°C (273.15 K) and 1 atm pressure, providing a reference point for gas behavior.

Front

How can you determine the number of atoms in a gas sample?

Back

The number of atoms in a gas sample can be determined using the ideal gas law and Avogadro's number.

Front

What are endangered elements, and why are they important?

Back

Endangered elements are those that are rare or at risk of depletion; they are important for various industrial and technological applications.

Front

What is the molar mass of magnesium (Mg)?

Back

The molar mass of magnesium (Mg) is approximately 24.31 g/mol.

Front

What is the molar mass of nitrogen (N₂)?

Back

The molar mass of nitrogen (N₂) is approximately 28.02 g/mol.

Front

What is the formula to calculate the mass of a product in a chemical reaction?

Back

Mass of product = (moles of reactant) x (molar mass of product).