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Chapter 3: Problem 17

What is the difference between matter in the phases of solid, liquid, and gas? What are sublimation and evaporation?

Short Answer

Expert verified
Matter exists as solid, liquid, and gas, differing in particle arrangement and movement. Sublimation is solid to gas; evaporation is liquid to gas.

Step by step solution

01

Understanding Matter Phases

Matter exists in different phases: solid, liquid, and gas. In a solid, particles are closely packed in a fixed, orderly arrangement. They vibrate in place, giving solids a definite shape and volume. In a liquid, particles are less tightly packed than in a solid and can slide past each other, allowing liquids to flow and take the shape of their container while maintaining a constant volume. In a gas, particles are far apart and move freely, filling any container they are in and having neither a definite shape nor a fixed volume.
02

Defining Sublimation and Evaporation

Sublimation is the process by which a substance transitions directly from the solid phase to the gas phase without passing through the liquid phase. An example of a substance that sublimates is dry ice (solid carbon dioxide). Evaporation is the process where a liquid changes into a gas at a temperature below its boiling point, typically occurring at the surface of the liquid. This commonly occurs with water when it is exposed to air and gradually turns into vapor.

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Key Concepts

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

Phase Transitions
Phase transitions refer to the change of a substance from one state of matter to another. These changes occur due to variations in temperature or pressure, influencing the energy and movement of particles. In everyday life, we often see these transitions when heating or cooling substances.
  • When heat is added, a substance might transition from solid to liquid (melting) or from liquid to gas (boiling/evaporation).
  • Conversely, removing heat can cause a gas to become a liquid (condensation) or a liquid to solidify (freezing).
These transitions are fundamental to processes ranging from the water cycle to cooking, reflecting the dynamic nature of matter.
Solid Liquid Gas
Solid, liquid, and gas are the three primary states of matter distinguished by particle arrangement and movement. Each state has unique characteristics due to the behavior of its particles.
  • Solid: In this state, particles are closely packed in a fixed structure, allowing solids to maintain a distinct shape and volume. Think of ice cubes or a block of wood.
  • Liquid: Particles in liquids are less organized, sliding past each other which lets liquids conform to the shape of their containers while maintaining volume. Water is an intuitive example.
  • Gas: Here, particles are widely spaced, moving freely which means gases fill the entire volume of their containers, like helium in a balloon.
Understanding these states helps us predict how substances will respond to different conditions like heating or pressure changes.
Sublimation
Sublimation is a fascinating phase transition where a substance moves directly from solid to gas without becoming liquid. This might seem unusual, but it happens with substances like dry ice.
  • Dry Ice: It sublimates at room temperature, producing carbon dioxide gas without becoming liquid, making it suitable for fog effects in displays.
  • Naphthalene balls: Commonly used as mothballs, they slowly sublimate to repel insects.
This transition needs specific conditions of temperature and pressure, which are not common among most solids.
Evaporation
Evaporation is a gradual phase transition where a liquid changes into a gas at temperatures below boiling point, especially happening at the surface. This process is vital in nature and human applications.
  • Occurs more readily with increased temperature and surface area, such as a puddle of water drying up in the sun.
  • This is how sweat cools us; as water evaporates from skin, it removes heat.
Evaporation also plays a crucial role in the water cycle, contributing to cloud formation and precipitation. It is a fundamental mechanism in maintaining Earth鈥檚 climate balance.

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Most popular questions from this chapter

Briefly describe the general characteristics of each of the following types of worlds: terrestrial planets, jovian planets, moons, asteroids, comets, and large Kuiper belt objects.

Alien Technology. Some people believe that Earth is regularly visited by aliens who travel here from other star systems. For this to be true, how much more advanced than our own would the space travel technology of the aliens have to be? Write one to two paragraphs to give a sense of the technological difference. (Hint: The ideas of scale in this chapter can help you contrast the distance the aliens travel easily with the distances we are now capable of traveling.)

Atomic Terminology Practice. a. The most common form of iron has 26 protons and 30 neutrons in its nucleus. State its atomic number, atomic mass number, and number of electrons if it is electrically neutral. b. Consider the following three atoms: Atom 1 has seven protons and eight neutrons; atom 2 has eight protons and seven neutrons; atom 3 has eight protons and eight neutrons. Which two are isotopes of the same element? c. Consider fluorine atoms with nine protons and ten neutrons. What are the atomic number and atomic mass number of this fluorine? Suppose we could add a proton to this fluorine nucleus. Would the result still be fluorine? Explain. What if we added a neutron to the fluorine nucleus? d. The most common isotope of uranium is \(^{238} \mathrm{U}\), but the form used in nuclear bombs and nuclear power plants is \(^{235} \mathrm{U}\) Given that uranium has atomic number \(92,\) how many neutrons are in each of these two isotopes of uranium?

Briefly describe the scale of the galaxy. How long would it take to count 100 billion stars? Why is the search for extraterrestrial intelligence (SETI) primarily a search for signals broadcast by civilizations in the past, rather than an attempt to carry out two-way radio conversations?

Communication with Mars. We use radio waves, which travel at the speed of light, to communicate with robotic spacecraft. How long does it take a message to travel from Earth to a spacecraft on Mars when (a) Mars is at its closest distance to Earth; (b) Mars is at its farthest distance from Earth. (Data: The distance from Earth to Mars ranges between about 56 and 400 million kilometers.)
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