The video explains that solutions can be solids, liquids, or gases, and are homogeneous mixtures. Salt water is used as an example to differentiate between elements, compounds, and mixtures. Solutions are not chemically bonded and can be separated physically. The video also discusses the importance of concentration in solutions, affecting properties like freezing point and hardness. Examples include air, alloys, and salt water, illustrating that solutions can exist in various states.

What is a key characteristic of solutions that distinguishes them from other types of mixtures?

• They can be separated by physical means.

• They are always liquids.

• They are made of a single element.

• They are homogeneous mixtures.

Why is salt water not considered a compound?

• It is a new substance with unique properties.

• Salt and water are physically mixed without a fixed ratio.

• Salt and water are chemically bonded.

• It has a fixed ratio of components.

What type of mixture is oil and water?

• Homogeneous mixture

• Heterogeneous mixture

• Solution

• Compound

Which of the following is a homogeneous mixture?

• Oil and water

• Sand and iron filings

• Salt water

• Carbon dioxide

In a solution, what is the term for the substance present in a smaller amount?

• Solvent

• Solute

• Compound

• Element

Which of the following is an example of a gaseous solution?

• Oil and water

• Salt water

• Air

• Bronze

What is the role of a solvent in a solution?

• It is the substance that dissolves the solute.

• It is always a liquid.

• It is the new substance formed.

• It is the substance in lesser quantity.

What happens to the freezing point of water when salt is added?

• It becomes unpredictable.

• It remains the same.

• It decreases.

• It increases.

How can the properties of a solution be altered?

• By changing the container.

• By adding more solvent.

• By varying the concentration of the solute.

• By changing the temperature.

What is the main difference between pure substances and mixtures?

• Pure substances are always solid.

• Mixtures have components that are chemically bonded.

• Pure substances consist of only one type of atom or compound.

• Mixtures cannot be separated physically.