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

What is the classification of milk?

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

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

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

What is an example of a homogeneous mixture?

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

What is an example of a diatomic molecule?

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

What is the classification of air?

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

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

<p>Elements (A)</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 (D)</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 (C)</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 (B)</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 (A)</p> Signup and view all the answers

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

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

Which type of mixture has a uniform composition throughout?

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

What is the classification of carbon dioxide (CO2)?

<p>Compound (B)</p> Signup and view all the answers

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

<p>Rocks (D)</p> Signup and view all the answers

What is the classification of water (H2O)?

<p>Compound (D)</p> Signup and view all the answers

Which of the following is a characteristic of compounds?

<p>They have a fixed ratio of atoms (D)</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) (C)</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 (C)</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. (D)</p> Signup and view all the answers

What is a characteristic of elements?

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

What is a compound?

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

What is a diatomic molecule?

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

What is a characteristic of mixtures?

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

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

<p>They represent elements. (B)</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. (C)</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. (C)</p> Signup and view all the answers

What is the primary characteristic of a mixture?

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

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

<p>They are pure substances. (B)</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. (C)</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. (B)</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. (D)</p> Signup and view all the answers

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

<p>To classify materials. (A)</p> Signup and view all the answers

Which of the following is an example of a compound?

<p>Water (H2O) (C)</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. (A)</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 (B)</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) (D)</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 (A)</p> Signup and view all the answers

What is the classification of nitrogen gas (N2)?

<p>Element (B)</p> Signup and view all the answers

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

<p>Rocks (C)</p> Signup and view all the answers

What is the classification of granite?

<p>Heterogeneous mixture (D)</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 (C)</p> Signup and view all the answers

What is the common characteristic of all pure substances?

<p>They have a fixed composition and properties (A)</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 (D)</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 (D)</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 (C)</p> Signup and view all the answers

What is represented in diagram (d)?

<p>A mixture of different substances (C)</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 (A)</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 (A)</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 (D)</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 (A)</p> Signup and view all the answers

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

<p>Composition (C)</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 (A)</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 (A)</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) (A)</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 (C)</p> Signup and view all the answers

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

<p>Rocks (A)</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 (C)</p> Signup and view all the answers

Which of the following is a characteristic of all mixtures?

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

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