chemistry: mixtures and pure substances
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Questions and Answers

What is a characteristic of pure substances?

  • Particle composition is not fixed, but can be separated by physical methods
  • Constituent particles have a fixed composition (correct)
  • Particles of different pure substances are identical
  • Composition of particles varies from one sample to another

    • What is a way to separate the components of a mixture?

  • By heating or cooling
  • By simple hand-picking, filtration, crystallisation, distillation, etc. (correct)
  • By dissolving in water
  • By chemical reactions

    • What is an element?

  • A type of compound
  • A pure substance consisting of only one type of atoms (correct)
  • A type of mixture
  • A type of pure substance with more than one type of atoms

    • What is a characteristic of heterogeneous mixtures?

    <p>Particles of different substances are not uniformly distributed</p> Signup and view all the answers

    What is a compound?

    <p>A type of pure substance consisting of two or more elements</p> Signup and view all the answers

    What is a characteristic of glucose?

    <p>Its particles are of same composition</p> Signup and view all the answers

    What is the typical sequence of states of matter when a substance is heated?

    <p>Solid, liquid, gas</p> Signup and view all the answers

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

    <p>A pure substance has a fixed composition, while a mixture has a variable composition</p> Signup and view all the answers

    What is the term for a mixture in which the components are uniformly distributed throughout the bulk?

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

    What is the term for the process by which a gas changes to a liquid?

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

    What is an example of a homogeneous mixture?

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

    What is the classification of matter that includes both pure substances and mixtures?

    <p>Macroscopic level</p> Signup and view all the answers

    What is the fundamental characteristic of solids?

    <p>They have definite volume and definite shape</p> Signup and view all the answers

    What is true about the particles in a gas?

    <p>They are far apart and their movement is easy and fast</p> Signup and view all the answers

    What is common to all three states of matter?

    <p>They are all composed of matter</p> Signup and view all the answers

    What happens to the particles in a substance when it changes from a solid to a liquid?

    <p>They gain more freedom of movement</p> Signup and view all the answers

    What is true about the shape of a liquid?

    <p>It takes the shape of its container</p> Signup and view all the answers

    What can cause a change from one state of matter to another?

    <p>Changes in both temperature and pressure</p> Signup and view all the answers

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