Gr 8 Natural Sciences Ch 2.1: Mixtures of elements and compounds
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Questions and Answers

What are the two main categories of matter?

  • Pure substances and mixtures (correct)
  • Solutions and suspensions
  • Elements and compounds
  • Homogeneous and heterogeneous mixtures

    • What is an example of a heterogeneous mixture?

  • Sea water
  • Rocks (correct)
  • Air
  • Gold (Au)

    • What is the classification of sugar (C12H22O11)?

  • Homogeneous mixture
  • Pure substance (compound) (correct)
  • Element
  • Mixture

    • What is the classification of oxygen gas (O2)?

    <p>Pure substance (element)</p> Signup and view all the answers

    What is the classification of milk?

    <p>Mixture (heterogeneous)</p> Signup and view all the answers

    What is the classification of steel (alloy of iron and carbon)?

    <p>Mixture (homogeneous)</p> Signup and view all the answers

    What is a mixture?

    <p>A combination of two or more substances that are not chemically bonded and retain their individual properties</p> Signup and view all the answers

    What is the main difference between pure substances and mixtures?

    <p>Pure substances are composed of only one type of matter, while mixtures are composed of multiple substances</p> Signup and view all the answers

    What is an example of a homogeneous mixture?

    <p>Sea water</p> Signup and view all the answers

    What is an example of a diatomic molecule?

    <p>Oxygen (O2)</p> Signup and view all the answers

    What is the classification of air?

    <p>Mixture (homogeneous)</p> Signup and view all the answers

    What do diagrams (a) and (b) represent?

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

    What is a characteristic of compounds?

    <p>They are made up of two or more kinds of atoms chemically bonded in a fixed ratio</p> Signup and view all the answers

    What is a characteristic of mixtures?

    <p>They retain their individual properties and can be separated by physical means</p> Signup and view all the answers

    What do diagrams (a), (b), and (c) have in common?

    <p>They all represent elements or compounds, but not mixtures</p> Signup and view all the answers

    Why is it essential to understand the distinction between elements, compounds, and mixtures?

    <p>To classify materials correctly</p> Signup and view all the answers

    Which of the following is a characteristic of a pure substance?

    <p>It has a fixed composition</p> Signup and view all the answers

    Which type of mixture has a uniform composition throughout?

    <p>Homogeneous mixture</p> Signup and view all the answers

    What is the classification of carbon dioxide (CO2)?

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

    Which of the following is an example of a heterogeneous mixture?

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

    What is the classification of water (H2O)?

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

    Which of the following is a characteristic of compounds?

    <p>They have a fixed ratio of atoms</p> Signup and view all the answers

    Which of the following is an example of a pure substance that is an element?

    <p>Gold (Au)</p> Signup and view all the answers

    What is the main difference between elements and compounds?

    <p>Elements are composed of one type of atom, while compounds are composed of multiple types of atoms</p> Signup and view all the answers

    Which of the following statements about pure substances is true?

    <p>Pure substances are composed of only one type of matter throughout.</p> Signup and view all the answers

    What is a characteristic of elements?

    <p>They are made up of only one kind of atom.</p> Signup and view all the answers

    What is a compound?

    <p>A pure substance made up of two or more kinds of atoms.</p> Signup and view all the answers

    What is a diatomic molecule?

    <p>A molecule made up of two atoms of the same kind.</p> Signup and view all the answers

    What is a characteristic of mixtures?

    <p>Their components retain their individual properties.</p> Signup and view all the answers

    What do diagrams (a) and (b) have in common?

    <p>They represent elements.</p> Signup and view all the answers

    What is the main difference between diagrams (c) and (d)?

    <p>One represents a compound and the other represents a mixture.</p> Signup and view all the answers

    What is the purpose of understanding the distinction between elements, compounds, and mixtures?

    <p>To distinguish between elements, compounds, and mixtures.</p> Signup and view all the answers

    What is the primary characteristic of a mixture?

    <p>It retains its individual properties.</p> Signup and view all the answers

    Which of the following is a characteristic of both elements and compounds?

    <p>They are pure substances.</p> Signup and view all the answers

    What is the difference between a compound and a mixture?

    <p>A compound is composed of chemically bonded atoms, while a mixture is not.</p> Signup and view all the answers

    What is represented in diagram (c)?

    <p>A compound consisting of molecules made up of two or more different kinds of atoms chemically bonded in a fixed ratio.</p> Signup and view all the answers

    What is the main difference between a pure substance and a mixture?

    <p>A pure substance is composed of only one type of matter, while a mixture is composed of multiple substances.</p> Signup and view all the answers

    What is the purpose of understanding the distinction between elements, compounds, and mixtures?

    <p>To classify materials.</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 the difference between diagrams (a) and (b)?

    <p>Diagram (a) represents an element consisting of single atoms, while diagram (b) represents an element consisting of diatomic molecules.</p> Signup and view all the answers

    What is the primary difference between a homogeneous and heterogeneous mixture?

    <p>The uniformity or non-uniformity of composition throughout</p> Signup and view all the answers

    Which of the following is an example of a pure substance that is a compound?

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

    Why is it important to classify matter as pure substances or mixtures?

    <p>To distinguish between substances with different compositions and properties</p> Signup and view all the answers

    What is the classification of nitrogen gas (N2)?

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

    Which of the following is an example of a mixture that is found in nature?

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

    What is the classification of granite?

    <p>Heterogeneous mixture</p> Signup and view all the answers

    What is the purpose of the flowchart for classifying matter?

    <p>To help visualize the classification of matter into pure substances and mixtures</p> Signup and view all the answers

    What is the common characteristic of all pure substances?

    <p>They have a fixed composition and properties</p> Signup and view all the answers

    What is the primary reason for distinguishing between pure substances and mixtures?

    <p>To classify materials based on their composition</p> Signup and view all the answers

    Which of the following statements is true about elements?

    <p>They consist of only one type of atom</p> Signup and view all the answers

    What is the primary difference between a homogeneous and heterogeneous mixture?

    <p>The uniformity or non-uniformity of composition</p> Signup and view all the answers

    What is represented in diagram (d)?

    <p>A mixture of different substances</p> Signup and view all the answers

    What is the main characteristic of a pure substance?

    <p>It consists of only one type of matter</p> Signup and view all the answers

    What is the purpose of diagrams (a), (b), and (c)?

    <p>To illustrate the difference between pure substances and mixtures</p> Signup and view all the answers

    What is a characteristic of compounds?

    <p>They are made up of two or more kinds of atoms chemically bonded</p> Signup and view all the answers

    Why is it essential to understand the distinction between elements, compounds, and mixtures?

    <p>To classify materials based on their composition</p> Signup and view all the answers

    What is the primary characteristic that distinguishes a pure substance from a mixture?

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

    Which of the following statements is true about elements and compounds?

    <p>Elements and compounds are both pure substances</p> Signup and view all the answers

    What is the main difference between a homogeneous and a heterogeneous mixture?

    <p>The uniformity of the mixture</p> Signup and view all the answers

    Which of the following is an example of a pure substance that is not an element?

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

    What is the purpose of classifying matter into pure substances and mixtures?

    <p>To understand the properties and behavior of different materials</p> Signup and view all the answers

    Which of the following is an example of a heterogeneous mixture found in nature?

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

    What is the main advantage of using a flowchart to classify matter?

    <p>It provides a step-by-step process for classifying matter</p> Signup and view all the answers

    Which of the following is a characteristic of all mixtures?

    <p>Variable proportion of components</p> Signup and view all the answers

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