Chemistry Basics: Elements and Compounds
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Questions and Answers

What is an element?

  • A substance that consists of only one type of atom (correct)
  • A physical blend of two or more substances
  • A substance that can be broken down into simpler substances
  • A substance that consists of two or more different elements

    • What is a compound?

  • A substance that consists of only one type of atom
  • A substance that consists of two or more different elements (correct)
  • A physical blend of two or more substances
  • A substance that can be broken down into simpler substances by chemical means

    • What is a characteristic of a mixture?

  • It has properties identical to its constituent elements
  • It is formed by a chemical reaction
  • It consists of only one type of atom
  • It is a physical blend of two or more substances (correct)

    • What is not a characteristic of an element?

    <p>It can be broken down into simpler substances</p> Signup and view all the answers

    What is an example of a compound?

    <p>Water</p> Signup and view all the answers

    What can be used to separate the components of a mixture?

    <p>Filtration</p> Signup and view all the answers

    What is a characteristic of elements?

    <p>They have different physical properties but same chemical properties.</p> Signup and view all the answers

    Which of the following is an example of a compound?

    <p>Water (H2O)</p> Signup and view all the answers

    What is a characteristic of mixtures?

    <p>Their composition can vary.</p> Signup and view all the answers

    How many elements occur naturally?

    <p>92</p> Signup and view all the answers

    What can be used to separate the components of a compound?

    <p>Chemical means</p> Signup and view all the answers

    What is a common difference between compounds and mixtures?

    <p>The ratio of elements they contain.</p> Signup and view all the answers

    Study Notes

    Substances

    Elements

    • A substance that consists of only one type of atom
    • Cannot be broken down into simpler substances by chemical means
    • Examples: Hydrogen (H), Carbon (C), Oxygen (O)
    • Represented by a one- or two-letter symbol (e.g. H, C, O)
    • Around 118 known elements, listed in the periodic table

    Compounds

    • A substance that consists of two or more different elements
    • Formed by chemical reaction between elements
    • Properties different from its constituent elements
    • Examples: Water (H2O), Carbon Dioxide (CO2), Ammonia (NH3)
    • Can be broken down into simpler substances by chemical means
    • Formula represents the ratio of atoms of each element in the compound

    Mixtures

    • A physical blend of two or more substances
    • Can be elements, compounds, or both
    • No chemical reaction occurs between components
    • Properties vary depending on the proportion of each component
    • Examples: Air (oxygen, nitrogen, others), Soil (dirt, water, air), Blood (water, proteins, cells)
    • Can be separated by physical means (filtration, sedimentation, etc.)

    Substances

    Elements

    • Consist of only one type of atom
    • Cannot be broken down into simpler substances by chemical means
    • Examples include Hydrogen (H), Carbon (C), and Oxygen (O)
    • Represented by a one- or two-letter symbol
    • There are around 118 known elements, listed in the periodic table

    Compounds

    • Consist of two or more different elements
    • Formed by chemical reaction between elements
    • Have properties different from their constituent elements
    • Examples include Water (H2O), Carbon Dioxide (CO2), and Ammonia (NH3)
    • Can be broken down into simpler substances by chemical means
    • Formula represents the ratio of atoms of each element in the compound

    Mixtures

    • A physical blend of two or more substances
    • Can be elements, compounds, or both
    • No chemical reaction occurs between components
    • Properties vary depending on the proportion of each component
    • Examples include Air (oxygen, nitrogen, others), Soil (dirt, water, air), and Blood (water, proteins, cells)
    • Can be separated by physical means (filtration, sedimentation, etc.)

    Elements

    • Consist of only one type of atom
    • Cannot be broken down into simpler substances by chemical means
    • Examples: hydrogen (H), oxygen (O), carbon (C)
    • Can exist in various forms (allotropes) with different physical properties, but same chemical properties
    • 118 known elements, with 92 occurring naturally and 26 being synthetic

    Compounds

    • Formed by the chemical combination of two or more different elements
    • Have properties different from their constituent elements
    • Composition always remains the same, with a fixed ratio of elements
    • Examples: water (H2O), carbon dioxide (CO2), sodium chloride (NaCl)
    • Can be broken down into simpler substances by chemical means

    Mixtures

    • Physical blends of two or more substances, maintaining their chemical properties
    • Composition can vary, with no fixed ratio of substances
    • Examples: air (oxygen, nitrogen, etc.), alloys (brass, steel, etc.), sand
    • Can be separated by physical means, such as filtration, evaporation, or magnetism

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    Description

    Learn about the fundamental substances in chemistry - elements and compounds. Understand their definitions, properties, and examples.

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