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Chapter 1: Problem 3

Give an example of a homogeneous mixture and an example of a heterogeneous mixture.

Short Answer

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Homogeneous mixture: saltwater; Heterogeneous mixture: salad.

Step by step solution

01

Understanding Homogeneous Mixtures

A homogeneous mixture is a mixture where the components that make it up are uniformly distributed throughout the mixture. This means that no matter where you sample the mixture, it will have the same composition. A common example of a homogeneous mixture is saltwater. In saltwater, the salt (sodium chloride) is completely dissolved in the water, making it uniform throughout.
02

Understanding Heterogeneous Mixtures

A heterogeneous mixture is a mixture where the components are not uniformly distributed, and different parts of the mixture have different compositions and properties. One common example of a heterogeneous mixture is a salad. In a salad, the ingredients like lettuce, tomatoes, and cucumbers are mixed together, but you can see each ingredient separately, and they're not uniform throughout.

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Key Concepts

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

Understanding Homogeneous Mixtures
A homogeneous mixture is a type of mixture in which the composition is consistent and uniform throughout the entire mixture. This means wherever you take a sample from the mixture, you will find the same proportion of components.
For example, when you mix salt in water, the salt dissolves completely, resulting in a consistent mixture鈥攁 classic example of a homogeneous mixture.

Key characteristics of homogeneous mixtures include:
  • Uniform composition: The substances in the mixture are evenly distributed.
  • Single phase: They exist in a single phase, either solid, liquid, or gas.
  • Cannot see individual components: The individual substances that make up the mixture are not visible.
This makes such mixtures easy to study and analyze as each part is identical.
Understanding Heterogeneous Mixtures
Unlike homogeneous mixtures, heterogeneous mixtures have a non-uniform composition. Components are not evenly distributed, leading to distinct parts with different properties.
An everyday example of a heterogeneous mixture is a salad. In this kind of mixture, you can easily see and separate each component like lettuce, tomatoes, and cucumbers, as they don't blend into a single uniform phase.

Important aspects of heterogeneous mixtures include:
  • Visible constituents: Different components are easily distinguishable.
  • Multiple phases: It often involves more than one distinct phase, such as solid and liquid.
  • Variety in composition: Different samples taken from the mixture may have varying proportions of the components.
These qualities make heterogeneous mixtures quite dynamic and diverse.
The Role of Chemical Composition in Mixtures
Chemical composition specifies the types and amounts of components in a mixture. It plays a crucial role in defining whether a mixture is homogeneous or heterogeneous.
The chemical composition tells us how the mixture is formed. In a homogeneous mixture, like saltwater, the chemical composition details how much salt is dissolved in the water. Meanwhile, in a heterogeneous mixture, such as a salad, the composition informs us of the proportions and types of individual ingredients.

In learning chemistry, understanding the chemical composition helps you:
  • Predict the behavior of mixtures: Knowing the composition can help forecast reactions and properties.
  • Identify substances: Helps in identifying substances within a mixture based on their composition.
  • Design processes: Useful in industrial applications where specific compositions are required.
Knowing the chemical composition is fundamental in many scientific analyses and practical applications.

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Most popular questions from this chapter

Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose. ( 1 ppm means \(1 \mathrm{~g}\) of fluorine per 1 million g of water.) The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons. What percent of the sodium fluoride is "wasted" if each person uses only \(6.0 \mathrm{~L}\) of water a day for drinking and cooking? (Sodium fluoride is 45.0 percent fluorine by mass. 1 gallon \(=3.79 \mathrm{~L} ; 1\) year \(=365\) days; density of water \(=1.0 \mathrm{~g} / \mathrm{mL} .)\)

A chemist in the nineteenth century prepared an unknown substance. In general, do you think it would be more difficult to prove that it is an element or a compound? Explain.

The medicinal thermometer commonly used in homes can be read to \(\pm 0.1^{\circ} \mathrm{F}\), whereas those in the doctor's office may be accurate to \(\pm 0.1^{\circ} \mathrm{C}\). In degrees Celsius, express the percent error expected from each of these thermometers in measuring a person's body temperature of \(38.9^{\circ} \mathrm{C}\).

Define these terms: (a) matter, (b) mass, (c) weight, (d) substance, (e) mixture.

A silver (Ag) object weighing \(194.3 \mathrm{~g}\) is placed in a graduated cylinder containing \(242.0 \mathrm{~mL}\) of water. The volume of water now reads \(260.5 \mathrm{~mL}\). From these data calculate the density of silver.
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