Exploring Chromatography and Density

What is paper chromatography used for?

• It is used for printing images on paper.

• It is used for creating paper products.

• It is used for separating and analyzing mixtures of substances.

• It is used for measuring the thickness of paper.

How does thermal expansion affect materials?

• Thermal expansion causes materials to increase in volume when heated, which can lead to structural stress and changes.

• Thermal expansion only affects liquids, not solids or gases.

• Thermal expansion causes materials to decrease in volume when heated.

• Thermal expansion has no effect on the structural integrity of materials.

Define density in your own words.

• Density is a measure of how much mass is contained in a given volume.

• Density is the total volume of an object divided by its mass.

• Density refers to the temperature of a substance.

• Density is the weight of an object regardless of its size.

What happens to the ink in paper chromatography?

• The ink separates into its individual components based on their solubility and affinity for the paper.

• The ink turns into a gas and evaporates during chromatography.

• The ink dissolves completely in water without separation.

• The ink remains unchanged throughout the process.

Why do different substances separate in chromatography?

• Different substances separate due to varying affinities for the stationary and mobile phases.

• Substances separate based on their color only.

• Separation occurs due to the temperature of the environment.

• All substances separate at the same rate regardless of their properties.

What is the formula for calculating density?

• Density = Mass x Volume

• Density = Mass + Volume

• Density = Mass / Volume

• Density = Volume / Mass

How does temperature affect the density of a liquid?

• Temperature inversely affects the density of a liquid; higher temperatures decrease density, while lower temperatures increase density.

• Density remains constant regardless of temperature changes.

• Higher temperatures increase density while lower temperatures decrease density.

• Temperature has no effect on the density of a liquid.

Explain how thermal expansion can be observed in everyday life.

• Thermal expansion can be observed in metal railway tracks, concrete sidewalks, and glass jars.

• Thermal expansion can be seen in the growth of plants.

• Thermal expansion does not affect liquids.

• Thermal expansion is only observed in gases.

What units are commonly used to measure density?

• grams per liter (g/L)

• milliliters per gram (mL/g)

• ounces per gallon (oz/gal)

• grams per cubic centimeter (g/cm³), kilograms per cubic meter (kg/m³), pounds per cubic foot (lb/ft³)

How can you determine if an object will float or sink in water?

• An object will float if it is submerged completely in water.

• An object will float if it is made of plastic.

• An object will sink if it is larger than the water surface.

• An object will float if its density is less than that of water; it will sink if its density is greater.