Science Quiz on Pure Substances
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Questions and Answers

What defines a pure substance?

  • It is a single type of particle. (correct)
  • It can be separated into other kinds of matter.
  • It is a mixture of different substances.
  • It consists of two or more types of particles.

    • Which of the following is an example of a homogeneous mixture?

  • Salad
  • Oil and water
  • Sugar dissolved in water (correct)
  • Sand and salt

    • What term is used for mixtures that have physically distinct parts?

  • Homogeneous mixtures
  • Compounds
  • Elements
  • Heterogeneous mixtures (correct)

    • Which of the following statements about mixtures is false?

    <p>All mixtures have a uniform composition.</p> Signup and view all the answers

    What can be used to separate dissolved substances from water?

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

    If two groups have different amounts of copper sulfate, what does this indicate?

    <p>Solutions can have different color intensities.</p> Signup and view all the answers

    What type of mixture is sea water classified as?

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

    When two substances are combined but do not dissolve, the result is typically what type of mixture?

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

    Which property indicates that a material can be drawn into wires?

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

    What is a characteristic feature of non-metals compared to metals?

    <p>They are poor conductors of heat.</p> Signup and view all the answers

    Which of the following is an example of a metal?

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

    What is the state of mercury at room temperature?

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

    Which elements are considered metalloids?

    <p>Silicon and Germanium</p> Signup and view all the answers

    What happens when you mix and heat iron filings with sulphur powder?

    <p>They form a new solid compound.</p> Signup and view all the answers

    Which of the following describes the texture and color of non-metals?

    <p>Dull and varied</p> Signup and view all the answers

    What is a property that non-metals do not exhibit?

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

    What type of change occurs when camphor is separated from salt?

    <p>Physical change</p> Signup and view all the answers

    Which of the following is a chemical change?

    <p>Rusting of iron</p> Signup and view all the answers

    What is the technique used to separate salt from sea-water?

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

    Which of the following physical properties can be observed without changing the composition of matter?

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

    During the burning of a candle, what type of changes take place?

    <p>Both physical and chemical changes</p> Signup and view all the answers

    What happens during the process of boiling water to form steam?

    <p>It is a physical change</p> Signup and view all the answers

    What is the best description for changes like cutting of trees and dissolving sugar in water?

    <p>Both are physical changes</p> Signup and view all the answers

    Which of these changes involves a change in chemical properties?

    <p>Burning of wood</p> Signup and view all the answers

    What characterizes a solution?

    <p>It is a homogeneous mixture of two or more substances.</p> Signup and view all the answers

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

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

    What is an example of a solid solution?

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

    What happens to the particles in a solution?

    <p>They are evenly distributed throughout the mixture.</p> Signup and view all the answers

    Which method can be used to determine if a mixture is heterogeneous?

    <p>Letting it sit undisturbed for some time.</p> Signup and view all the answers

    What is the phase of the particles in a solution like lemonade?

    <p>The particles are evenly distributed and do not settle.</p> Signup and view all the answers

    How do you identify a substance in the context of mixtures?

    <p>It consistently has a uniform composition.</p> Signup and view all the answers

    In solution science, what does homogeneity refer to?

    <p>The uniform distribution of components throughout.</p> Signup and view all the answers

    What mass of potassium nitrate is needed to produce a saturated solution in 50 grams of water at 313 K?

    <p>62 grams</p> Signup and view all the answers

    What would happen to the solubility of potassium chloride as the solution cools from 353 K to room temperature?

    <p>The solubility decreases significantly.</p> Signup and view all the answers

    At 293 K, which salt has the highest solubility?

    <p>Potassium nitrate</p> Signup and view all the answers

    Which of the following best describes what happens to the solubility of salts when temperature increases?

    <p>Solubility of most salts increases.</p> Signup and view all the answers

    What is a saturated solution?

    <p>A solution where the maximum amount of solute has been dissolved at a given temperature.</p> Signup and view all the answers

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

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

    How would you confirm that a colorless liquid is pure water?

    <p>By checking if it has a boiling point of 100°C at sea level.</p> Signup and view all the answers

    Which of the following materials is categorized as a pure substance?

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

    Study Notes

    Pure Substances and Mixtures

    • A pure substance consists of only one type of particle and cannot be physically separated.
    • Examples include distilled water and crystalline compounds like copper sulfate.
    • Mixtures are combinations of two or more pure substances and can be either homogeneous or heterogeneous.

    Homogeneous vs. Heterogeneous Mixtures

    • Homogeneous Mixtures: Have a uniform composition, the components are indistinguishable. Examples include sugar dissolved in water and saltwater.
    • Heterogeneous Mixtures: Contain physically distinct parts and have non-uniform compositions. Examples include sand in water and salad.

    Solutions

    • A solution is a specific type of homogeneous mixture where a solute is dissolved in a solvent (e.g., sugar in water).
    • Solutions can be liquids, solids (alloys), or gases (air) and exhibit uniform properties throughout.

    Physical and Chemical Changes

    • Physical Changes: Changes that do not alter the chemical composition, such as melting butter or boiling water.
    • Chemical Changes: Involve a change in chemical composition and properties, resulting in new substances (e.g., rusting of iron, burning of wood).

    Properties of Metals and Non-Metals

    • Metals: Typically shiny, malleable, ductile, and good conductors of heat and electricity. Examples include iron and copper.
    • Non-Metals: Generally dull, brittle, poor conductors. Examples include sulfur, phosphorus, and noble gases like argon.
    • Metalloids: Exhibit properties of both metals and non-metals (e.g., silicon, boron).

    Solubility and Temperature

    • Solubility is the ability of a substance to dissolve in a solvent at a given temperature, typically expressed in grams of solute per 100 grams of solvent.
    • Solubility often increases with temperature for many salts; potassium nitrate shows significant increase at higher temperatures.

    Key Concepts

    • Saturated Solution: A solution that cannot dissolve any more solute at a given temperature.
    • Colloids: Mixtures where tiny particles are dispersed in another substance but do not settle out (e.g., milk).
    • Suspensions: Mixtures where particles are suspended in a liquid but can settle out over time (e.g., muddy water).

    Experiments and Observations

    • Light beam experiments can demonstrate the transparency of solutions.
    • Comparing the color intensity of solutions reveals variability even among homogeneous mixtures.
    • Observations can lead to distinguishing between homogeneous and heterogeneous mixtures through physical properties.

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    Related Documents

    Matter Around Us: Pure Substances PDF

    Description

    This quiz explores the concepts of pure substances and mixtures, focusing on their definition and examples. Participants will test their understanding of the properties and classifications of different types of matter, emphasizing the distinction between pure substances and mixtures.

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