Mixtures and Solutions

In a solution of saltwater, what is the solvent?

• salt

• water

• ice

• the glass

Answer explanation

In a saltwater solution, the solvent is the substance that dissolves the solute. Here, water is the solvent as it dissolves the salt, making it the correct answer.

What is a solute?

• different materials placed together but keeping their own properties

• a mixture in which substances spread out evenly and will not settle

• the degree to which a material will dissolve in another substance

• the substance in a solution that has the greatest amount

• the substance in a solution that has the least amount

Answer explanation

A solute is defined as the substance in a solution that has the least amount. It dissolves in the solvent, which is the substance present in the greater amount.

Which process would you use to separate solids that float from the remaining solids and other items that remain in a liquid mixture. The solids float to the top on their own or when stirred, and are then skimmed off the surface of the liquid.

• Evaporation

• Magnetic Attraction

• Filtration

• Floatation

• Sifting

Answer explanation

Floatation is the process used to separate solids that float from a liquid mixture. The solids rise to the surface, allowing them to be skimmed off easily, making it the correct choice for this separation method.

What is solubility?

• different materials placed together but keeping their own properties

• a mixture in which substances spread out evenly and will not settle

• the degree to which a material will dissolve in another substance

• the substance in a solution that has the greatest amount

• the substance in a solution that has the least amount

Answer explanation

Solubility refers to the degree to which a material can dissolve in another substance. The correct choice explains this concept accurately, distinguishing it from other options that describe mixtures or components.

Which process would you use to separate smaller solid particles from larger solid particles. A mixture of different sized solids is put into a container that has a screen material at the bottom with certain sized holes in it. The smaller particles go through the screen and the larger ones do not.

• Evaporation

• Magnetic Attraction

• Filtration

• Floatation

• Sifting

Answer explanation

Sifting is the process used to separate smaller solid particles from larger ones by using a screen with holes. The smaller particles pass through while the larger ones remain, making sifting the correct choice.

What is a solvent?

• different materials placed together but keeping their own properties

• a mixture in which substances spread out evenly and will not settle

• the degree to which a material will dissolve in another substance

• the substance in a solution that has the greatest amount

• the substance in a solution that has the least amount

Answer explanation

A solvent is defined as the substance in a solution that has the greatest amount, which allows it to dissolve other substances. This distinguishes it from solutes, which are present in lesser amounts.

Which process would you use to separate solid particles from larger particles in a mixture with filter paper in a funnel to trap solids so that the liquids will pass through.

• Chromatography

• Magnetic Attraction

• Filtration

• Floatation

• Sifting

Answer explanation

The correct process to separate solid particles from larger particles in a mixture is filtration. Using filter paper in a funnel allows solids to be trapped while liquids pass through, effectively separating the components.

Which process would you use to separate magnetic material from a mixture of other substances?

• Chromatography

• Magnetic Attraction

• Filtration

• Floatation

• Sifting

Answer explanation

To separate magnetic material from a mixture, the best method is Magnetic Attraction. This process uses magnets to pull out magnetic substances, making it effective for this specific task.

Which process would you use to separate a solid that has dissolved in a liquid solution. The solution is heated or left uncovered until the liquid turns to gas and leave the solid behind.

• Evaporation

• Magnetic Attraction

• Filtration

• Floatation

• Sifting

Answer explanation

The process described is evaporation, where the liquid in a solution is heated or left uncovered, causing it to turn into gas and leaving the dissolved solid behind. This effectively separates the solid from the liquid.

Which is an example of a solution?

• trail mix

• cereal with milk and banannas

• a bag of candy

• tea

Answer explanation

Tea is a homogeneous mixture where the components are evenly distributed, making it a solution. In contrast, trail mix, cereal with milk and bananas, and a bag of candy are heterogeneous mixtures.