/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 31 List three examples of substance... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 3: Problem 31

List three examples of substances. Explain why each is a substance.

Short Answer

Expert verified
Water (H2O), gold (Au), and carbon dioxide (CO2) are examples of substances. Water is a compound composed of 2 hydrogen atoms and 1 oxygen atom, having consistent properties such as boiling and freezing points. Gold is an element made of only gold atoms, known for its unique physical and chemical properties. Carbon dioxide is a compound of 1 carbon atom and 2 oxygen atoms, with properties like density and reactivity that make it identifiable as a substance.

Step by step solution

01

Example 1: Water (H2O)

Water is a well-known substance that is composed of two hydrogen (H) atoms and one oxygen (O) atom, chemically bonded together in a specific ratio (2:1). The distinct properties and well-defined composition of water make it a substance. Water exhibits consistent properties like a specific boiling point (100 degrees Celsius) and freezing point (0 degrees Celsius) under standard conditions, which makes it identifiable as a unique substance.
02

Example 2: Gold (Au)

Gold is an element, which means it is composed of only one type of atom 鈥� gold atoms. It is known for its distinct properties such as being a heavy, shiny, and ductile metal with a bright yellow color that does not tarnish. Gold has a specific atomic number (79) and a unique set of chemical and physical properties that distinguish it from other elements. These characteristics make gold a substance.
03

Example 3: Carbon dioxide (CO2)

Carbon dioxide is a compound, formed by the chemical combination of one carbon (C) atom and two oxygen (O) atoms in a specific proportion (1:2). It is a colorless, odorless gas under standard conditions and is a crucial component of Earth鈥檚 atmosphere. Carbon dioxide has consistent properties, such as a well-defined density, specific solubility in water, and reactivity with other chemical compounds, making it clearly identifiable as a substance.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

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

Understanding Water as a Pure Substance
Water is a fundamental example of a pure substance due to its consistent chemical structure of two hydrogen atoms bonded with one oxygen atom, represented as H鈧侽. This specific 2:1 ratio remains constant in every water molecule, ensuring its classification as a chemical compound. Water's properties, such as boiling at 100掳C and freezing at 0掳C under normal atmospheric pressure, are predictable and consistent. These properties aid in recognizing water as a pure substance. Additionally, its importance in biological processes and environments further exemplifies its role as a pure substance essential for life.
The Purity of Gold
Gold, represented by the chemical symbol Au, is a noble metal known for its purity. It belongs to the group of elements called metals and is made entirely of only one type of atom鈥攇old atoms. This elemental nature means that gold is a homogeneous material throughout, an important characteristic of a pure substance. It is recognized for several distinct traits such as ductility, malleability, and a resistance to tarnishing, which contribute to its uniqueness and value. These consistent properties are why gold is often found in high-purity forms, such as gold bullion, and confirm its status as a pure substance.
Carbon Dioxide's Role as a Pure Substance
Carbon dioxide (CO鈧�) is a chemical compound formed from one carbon atom and two oxygen atoms, always in the specific molar ratio of 1:2. This consistency marks it as a classic example of a pure substance. Although it exists as a gas at room temperature, carbon dioxide's attributes do not change. It possesses a distinct density and solubility characteristics in water that help differentiate it from other gases. Importantly, CO鈧� is a critical greenhouse gas and is vital in processes like photosynthesis, showcasing its prominent place as a pure substance in various ecological and industrial contexts.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

A 100-g sample of an unknown salt contains 64 g of chlorine. What is the percent by mass of chlorine in the compound?

Describe the separation technique that could be used to separate each of the following mixtures. a. two colorless liquids b. a non dissolving solid mixed with a liquid c. red and blue marbles of the same size and mass

Is the production of charcoal from the dry distillation of wood a chemical or a physical change? Explain.

A 78.0-g sample of an unknown compound contains 12.4 g of hydrogen. What is the percent by mass of hydrogen in the compound?

Boiling Water At what temperature would 250 \(mL\) of water boil? 1000 \(mL\) ? Is the boiling point an intensive or extensive property? Explain.
See all solutions

Recommended explanations on Chemistry Textbooks

Making Measurements

Read Explanation

Kinetics

Read Explanation

Nuclear Chemistry

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Inorganic Chemistry

Read Explanation

Physical Chemistry

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.