IPC Fall Semester Exam 2024

Front

What is surface tension?

Back

Surface tension is the property of water that allows light objects, such as water gliders, to rest on top of the water due to the cohesive forces between water molecules.

Front

How do you calculate dilution of a solution?

Back

To calculate dilution, use the formula: C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Front

What is the molarity of a solution?

Back

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

Front

What does it mean for a molecule to be polar?

Back

A polar molecule has a distribution of electrical charge that leads to a positive end and a negative end, as seen in water (H2O).

Front

What is cohesion in terms of molecular attraction?

Back

Cohesion is the attraction of molecules to the same substance, which in water allows for phenomena like surface tension.

Front

What is adhesion?

Back

Adhesion is the attraction of molecules to different substances, which allows water to climb up a straw or stick to surfaces.

Front

What is capillary action?

Back

Capillary action is the ability of water to flow in narrow spaces against gravity, due to the combination of cohesion and adhesion.

Front

How do you determine the solubility of a substance?

Back

Solubility is determined by the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature.

Front

What is the solubility of NaNO3 at 10°C?

Back

At 10°C, the solubility of NaNO3 is 80 g per 100 g of H2O.

Front

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

Back

To find solubility in a different amount of solvent, use the ratio of solubility to solvent amount. For example, in 50 g of H2O, the solubility of NaNO3 would be 40 g.