IPC Fall Semester Exam 2024

Front

What is molarity?

Back

Molarity (M) is a measure of concentration defined as the number of moles of solute per liter of solution.

Tags

NGSS.HS-PS1-5

Front

How do you calculate the molarity of a solution?

Back

Molarity = moles of solute / liters of solution.

Front

What is the formula for diluting a solution?

Back

C1V1 = C2V2, where C is concentration and V is volume.

Front

What does it mean for a substance to be a universal solvent?

Back

A universal solvent is a substance that can dissolve many different solutes; water is often called the universal solvent due to its ability to dissolve many ionic and polar substances.

Front

Why do water molecules have a polar structure?

Back

Water molecules have a polar structure because of the difference in electronegativity between hydrogen and oxygen, leading to a partial positive charge on hydrogen and a partial negative charge on oxygen.

Front

What is the solubility of KBr at 80°C?

Back

The solubility of KBr at 80°C is 100 g per 100 g of water.

Tags

NGSS.MS-PS1-4

Front

If 2.0 moles of sodium bromide are dissolved in 200 mL of solution, what is the molarity?

Back

The molarity is 2.0 M.

Front

How do you determine the solubility of a substance in a different amount of solvent?

Back

Use the ratio of solubility given (e.g., 80 g/100 g of H2O) to find the solubility in the new amount of solvent.

Front

What is the solubility of NaNO₃ in 50 g of H₂O if its solubility is 80 g/100 g of H₂O?

Back

The solubility in 50 g of H₂O would be 40 g.

Front

What is the significance of a solution being diluted?

Back

Dilution decreases the concentration of solute in a solution, which can affect chemical reactions and properties.