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Chapter 1: Problem 75

What is the difference between homogeneous and heterogeneous matter? Classify each of the following as homogeneous or heterogeneous. a. a door b. the air you breathe c. a cup of coffee (black) d. the water you drink e. salsa f. your lab partner

Short Answer

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Homogeneous matter is uniform and has the same properties throughout, while heterogeneous matter is non-uniform and has different properties in different parts. a. A door: Heterogeneous b. The air you breathe: Homogeneous c. A cup of black coffee: Homogeneous d. The water you drink: Homogeneous e. Salsa: Heterogeneous f. Your lab partner: Heterogeneous

Step by step solution

01

Define homogeneous and heterogeneous matter

Homogeneous matter is a type of matter that has the same properties and composition throughout. It is uniform, meaning you cannot distinguish one part of it from another. This means that it cannot be separated into its individual components without chemical reactions. Heterogeneous matter, on the other hand, is a type of matter that has different properties and compositions in different parts. It is not uniform, and you can distinguish its different components. It can be separated into its individual components based on physical methods such as filtration and centrifugation.
02

Classify each item as homogeneous or heterogeneous

a. A door: Heterogeneous Doors are made of various materials such as wood, metal, glass, and plastic that are combined in different parts of the door. This makes the door non-uniform and heterogeneous. b. The air you breathe: Homogeneous Air is a mixture of gases (mainly nitrogen, oxygen, and trace amounts of other gases) that are evenly distributed, making it uniform and homogeneous in nature. c. A cup of black coffee: Homogeneous Black coffee is a uniform mixture of water and extracted coffee solutes, making it homogeneous. However, if there are undissolved particles or cream added to the coffee, it would become heterogeneous. d. The water you drink: Homogeneous Water is a uniform substance consisting of hydrogen and oxygen molecules (H2O) evenly distributed throughout, making it homogeneous. e. Salsa: Heterogeneous Salsa is a mixture of various ingredients, such as tomatoes, onions, peppers, and spices. These ingredients are not uniformly mixed, making salsa heterogeneous in nature. f. Your lab partner: Heterogeneous A human being (your lab partner) is made up of various organs, tissues, and cells with different properties and compositions. These components are not uniformly distributed throughout the body, making humans heterogeneous in nature.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Classification of Matter
Understanding the classification of matter is fundamental in the study of chemistry and material science. Matter can be broadly categorized into two groups: homogeneous and heterogeneous.

Homogeneous matter is uniform in composition and properties throughout. Solutions, such as air and black coffee (without additives), are classic examples of homogeneous mixtures. They are made up of substances that are so completely blended that the mixture appears the same everywhere with no visible boundaries or regions.

Heterogeneous matter, in contrast, consists of substances that are not evenly distributed, leading to the formation of distinct regions within the material. Everyday examples include salsa and a door, which visibly display different components and phases.

This binary classification is a starting point for studying more complex forms of matter, and for applying various physical and chemical methods to separate or manipulate them.
Physical Properties of Matter
Physical properties are attributes of matter that can be observed or measured without changing its composition. These properties include texture, color, odor, melting point, boiling point, density, and state of matter (solid, liquid, or gas), among others.

For instance, when classifying matter as homogeneous or heterogeneous, visual inspection, a physical property, is often used. The uniform texture and color of coffee and air mark them as homogeneous, whereas the varied textures and components of salsa and the intricate structure of a door are classic markers of heterogeneous matter.

Importance in Classification

Understanding physical properties also aids in determining which separation techniques might be most effective for a given mixture. These properties are fundamental in identifying substances and understanding how they interact with one another.
Chemical Properties of Matter
Chemical properties are characteristics that become evident during or after a chemical reaction; they describe the matter's potential to undergo chemical change. These properties include reactivity with other chemicals, toxicity, flammability, acidity or basicity, and oxidation states.

For example, the chemical properties of hydrogen and oxygen molecules within water do not alter their homogeneous nature but point towards their potential to react with other substances. Chemical properties explain why certain substances combine or transform under specific conditions, offering insights into the predictable behaviors of matter during chemical reactions.
Separation Techniques
In practical applications, separation techniques are employed to sort the different components in a mixture. They are based on differences in physical or chemical properties. Common separation methods include filtration, centrifugation, distillation, and chromatography.

Physical Separation

Filtration and centrifugation are physical methods typically used for separating heterogeneous mixtures. Filtration, for example, could be applied to separate solid particles from a liquid in salsa.

Distillation and Chromatography

Distillation is a physical method that relies on differences in boiling points, useful for homogenous mixtures. Chromatography separates substances based on their movement through a stationary phase, which might be employed to analyze the components of air.

Each technique is chosen according to the specific properties and composition of the matter in question, highlighting the interconnected nature of matter classification and its properties with separation processes.

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Most popular questions from this chapter

You have a \(1.0-\mathrm{cm}^{3}\) sample of lead and a \(1.0-\mathrm{cm}^{3}\) sample of glass. You drop each in separate beakers of water. How do the volumes of water displaced by each sample compare? Explain.

An experiment was performed in which an empty \(100-\mathrm{mL}\) graduated cylinder was weighed. It was weighed once again after it had been filled to the \(10.0-\mathrm{mL}\) mark with dry sand. A \(10-\mathrm{mL}\) pipet was used to transfer \(10.00 \mathrm{~mL}\) of methanol to the cylinder. The sand- methanol mixture was stirred until bubbles no longer emerged from the mixture and the sand looked uniformly wet. The cylinder was then weighed again. Use the data obtained from this experiment (and displayed at the end of this problem) to find the density of the dry sand, the density of methanol, and the density of sand particles. Does the bubbling that occurs when the methanol is added to the dry sand indicate that the sand and methanol are reacting? Mass of cylinder plus wet sand \(\quad 45.2613 \mathrm{~g}\) Mass of cylinder plus dry sand \(\quad 37.3488 \mathrm{~g}\) Mass of empty cylinder \(22.8317 \mathrm{~g}\) Volume of dry sand \(10.0 \mathrm{~mL}\) Volume of sand plus methanol \(\quad 17.6 \mathrm{~mL}\) Volume of methanol \(\quad 10.00 \mathrm{~mL}\)

The density of pure silver is \(10.5 \mathrm{~g} / \mathrm{cm}^{3}\) at \(20^{\circ} \mathrm{C}\). If \(5.25 \mathrm{~g}\) of pure silver pellets is added to a graduated cylinder containing \(11.2 \mathrm{~mL}\) of water, to what volume level will the water in the cylinder rise?

Classify the following as physical or chemical changes. a. Moth balls gradually vaporize in a closet. b. Hydrofluoric acid attacks glass, and is used to etch calibration marks on glass laboratory utensils. c. A French chef making a sauce with brandy is able to burn off the alcohol from the brandy, leaving just the brandy flavoring. d. Chemistry majors sometimes get holes in the cotton jeans they wear to lab because of acid spills.

Indicate the number of significant figures in each of the following: a. This book contains more than 1000 pages. b. A mile is about \(5300 \mathrm{ft}\). c. A liter is equivalent to \(1.059\) qt. d. The population of the United States is approaching \(3.0 \times 10^{2}\) million. e. A kilogram is \(1000 \mathrm{~g}\). f. The Boeing 747 cruises at around \(600 \mathrm{mi} / \mathrm{h}\).
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