Classifying Mixtures and Suspensions

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Questions and Answers

Which of the following is an example of a mechanical mixture?

Cornflakes and milk (correct)

Foggy air

Tap water

Salad dressing

What distinguishes a suspension from a solution?

Suspensions can settle over time, while solutions cannot. (correct)

Suspensions are always cloudy, while solutions are always clear.

Solutions contain solid particles, whereas suspensions do not.

Solutions require mixing, while suspensions do not.

Identify the substance categorized as a solution.

Muddy water

Abrasive skin cleanser

Clean air (correct)

Orange juice

Which of the following pairs includes items that are both mechanical mixtures?

Cornflakes and milk, concrete Signup and view all the answers

What characteristic of solutions makes them different from mechanical mixtures?

Solutions have a uniform composition throughout. Signup and view all the answers

Which component is an example of a suspension?

Muddy water Signup and view all the answers

What would increase the clarity of a suspension?

Allowing it to settle over time. Signup and view all the answers

Which of the following is NOT a characteristic of a mechanical mixture?

Looks the same throughout. Signup and view all the answers

What characterizes a mechanical mixture?

Different parts can be seen with the unaided eye. Signup and view all the answers

Which of the following is an example of a suspension?

Muddy water Signup and view all the answers

How do suspensions behave if left undisturbed?

They separate into layers. Signup and view all the answers

Which of the following substances is considered a pure substance?

Sugar Signup and view all the answers

What is a common misconception about fruit juice labeled as '100% pure'?

It is actually a mixture. Signup and view all the answers

What type of mixture remains uniform throughout?

Homogeneous mixture Signup and view all the answers

What happens to the fatty part in farm-fresh milk if left standing?

It floats to the top. Signup and view all the answers

What defines a suspension compared to other types of mixtures?

It has solid or liquid particles that can settle upon standing. Signup and view all the answers

What does the process of homogenization do to milk?

It breaks down fat into tiny droplets. Signup and view all the answers

Which of the following is NOT a characteristic of a solution?

The particles can be seen under a microscope. Signup and view all the answers

Which of the following examples can be classified as a solution?

Clear apple juice Signup and view all the answers

What happens when marbles are combined with sand in a container according to the model exercise?

The total volume equals the sum of the marbles and sand. Signup and view all the answers

What is the primary reason particles in a solution cannot be seen?

They are too small to be distinguished. Signup and view all the answers

Which substance is listed as an example of a solid solution?

Stainless steel Signup and view all the answers

What is a characteristic of an emulsion?

It remains a uniform mixture without separation. Signup and view all the answers

In the context of milk, what happens if homogenization is not performed?

The cream will rise to the top. Signup and view all the answers

Study Notes

Mixtures

Mixtures are substances not purely one substance.
Examples include hand lotion, shampoo, soap, foods (with preservatives/additives), and fruit juice.
Fruit juice labeled "100% pure" is still a mixture of water, citric acid, and other substances.
Mixtures can be classified based on appearance.

Classifying Mixtures

Pure substances are common substances like sugar, water, salt, and oxygen gas.
Substances may appear pure, but in reality, they are mixtures.
Vinegar is a good example of a substance that may seem pure but is a mixture (not a pure substance).
To classify matter, understand mixtures.

Mechanical Mixtures

Mechanical mixtures contain visible parts.
Granola cereal and concrete are examples of mechanical mixtures.

Suspensions

Suspensions are cloudy mixtures with solid or liquid clumps in a liquid or gas.
Muddy water and tomato juice are examples.
Parts may settle into layers if not stirred.
Farm-fresh milk is a suspension; cream floats, water sinks.
Commercially available milk is an emulsion (a special type of suspension).
Homogenization is a process to keep emulsion stable.

Solutions

Solutions appear as one substance.
The parts are entirely mixed.
Clear apple juice, clean air, and stainless steel are solutions.
Particles of one substance dissolved in another.
The dissolving substance is called the solvent; the dissolved substance is called the solute.

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Description

Explore the fascinating world of mixtures, including mechanical mixtures and suspensions. This quiz will help you understand how substances can appear pure but actually contain mixtures. Dive into examples and classifications to enhance your knowledge of matter.