Gr 9 Natural Sciences Ch 10: Acids & Bases, and Ph Value
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Questions and Answers

What characteristic is typically associated with acids?

  • Turn red litmus blue
  • Taste sour (correct)
  • Taste bitter
  • Feel slippery between your fingers

    • Which pH value is considered neutral?

  • 7 (correct)
  • 1
  • 14
  • 3

    • What do bases typically taste like?

  • Bitter (correct)
  • Sour
  • Sweet
  • Salty

    • What is the pH range for basic substances?

    <p>7 to 14</p> Signup and view all the answers

    Which of the following is a common acidic substance?

    <p>Lemon juice</p> Signup and view all the answers

    Which property is associated with bases?

    <p>Can make acids lose their acidic character</p> Signup and view all the answers

    What indicator is known to turn red litmus paper blue?

    <p>Basic solutions</p> Signup and view all the answers

    What does the term 'pH' stand for?

    <p>Power of hydrogen</p> Signup and view all the answers

    What pH level is considered neutral?

    <p>pH 7</p> Signup and view all the answers

    Which indicator turns red in acidic solutions?

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

    What color does red cabbage water turn in neutral solutions?

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

    Which pH meter characteristic makes it preferable for laboratories?

    <p>Offers quick and precise measurements</p> Signup and view all the answers

    What color does a universal indicator turn in strong basic solutions?

    <p>Dark Purple</p> Signup and view all the answers

    Which of the following ranges is associated with basic substances?

    <p>pH 7.1 to pH 14</p> Signup and view all the answers

    What is the function of an acid-base indicator?

    <p>Changes color in response to pH</p> Signup and view all the answers

    What is the result of using red litmus paper in a basic solution?

    <p>Turns blue</p> Signup and view all the answers

    What type of solutions turn the Red Cabbage indicator yellow?

    <p>Strongly Basic Solutions</p> Signup and view all the answers

    Which pH range indicates strong acids?

    <p>pH 0 to pH 1.9</p> Signup and view all the answers

    What pH value indicates a substance is acidic?

    <p>pH below 7</p> Signup and view all the answers

    Which of the following statements correctly describes a characteristic of bases?

    <p>Feel slippery between your fingers</p> Signup and view all the answers

    On the pH scale, which value represents a neutral substance?

    <p>7</p> Signup and view all the answers

    What is the pH characteristic of lemon juice compared to orange juice?

    <p>Lemon juice has a lower pH than orange juice.</p> Signup and view all the answers

    Which of the following examples is classified as a neutral substance?

    <p>Cooking oil</p> Signup and view all the answers

    Which color does red cabbage indicator turn in slightly basic solutions?

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

    Which acid-base indicator provides a precise pH measurement over a wide range?

    <p>Universal Indicator</p> Signup and view all the answers

    Which indicator is used to determine whether a solution is acidic or basic?

    <p>Universal indicator</p> Signup and view all the answers

    What pH range represents strong acids?

    <p>pH 1 to pH 3</p> Signup and view all the answers

    What is a common property shared between both acids and bases?

    <p>They can both be corrosive</p> Signup and view all the answers

    What origin does the term 'pH' relate to?

    <p>Potential of hydrogen</p> Signup and view all the answers

    What happens to blue litmus paper in an acidic solution?

    <p>Turns red</p> Signup and view all the answers

    Which pH meter feature is beneficial for laboratories?

    <p>It offers quick and precise measurements.</p> Signup and view all the answers

    Which of the following changes occur when an acid reacts with a base?

    <p>They lose their acidic and basic character</p> Signup and view all the answers

    What color change occurs in universal indicator for weak bases?

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

    How is red cabbage indicator paper made?

    <p>By soaking paper in red cabbage juice and drying it.</p> Signup and view all the answers

    What color does litmus paper appear in neutral solutions?

    <p>No color change</p> Signup and view all the answers

    Which pH level is indicative of strongly basic solutions?

    <p>pH 12 to pH 14</p> Signup and view all the answers

    What is the general pH value range for acids?

    <p>1 to 6</p> Signup and view all the answers

    Which of the following substances is categorized as a base?

    <p>Bicarbonate of soda</p> Signup and view all the answers

    Which property is commonly associated with bases when touched?

    <p>Feel slippery</p> Signup and view all the answers

    What pH value represents a strong acid?

    <p>1</p> Signup and view all the answers

    What color does blue litmus paper turn in an acidic solution?

    <p>Turns red</p> Signup and view all the answers

    What pH value is indicative of neutral substances?

    <p>7</p> Signup and view all the answers

    Which of the following substances is an example of an indicator?

    <p>Universal indicator</p> Signup and view all the answers

    What can be concluded about substances with a pH value of 6?

    <p>They are weakly acidic.</p> Signup and view all the answers

    Which statement accurately describes the color change of red cabbage water in a strongly basic solution?

    <p>It turns yellow.</p> Signup and view all the answers

    What pH level is considered to be neutral?

    <p>pH 7</p> Signup and view all the answers

    Which of the following is a property of the universal indicator?

    <p>It changes color over a wide range of pH values.</p> Signup and view all the answers

    When using litmus paper, what happens to blue litmus paper in an acidic solution?

    <p>It turns red.</p> Signup and view all the answers

    What characteristic of pH meters makes them suitable for laboratory use?

    <p>They offer quick and precise pH measurements.</p> Signup and view all the answers

    In which solution will red cabbage water turn shades of pink or red?

    <p>Strongly acidic solutions</p> Signup and view all the answers

    Which indicator is specifically known for not changing color in neutral solutions?

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

    What pH range is indicative of stronger acids?

    <p>pH 1 to pH 2</p> Signup and view all the answers

    Which of the following colors indicates a weak acid when using a universal indicator?

    <p>Orange to yellow</p> Signup and view all the answers

    What is the primary component of red cabbage that allows it to be an acid-base indicator?

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

    Which statement correctly describes the behavior of the Red Cabbage Indicator in basic solutions?

    <p>It changes to yellow in strongly basic solutions.</p> Signup and view all the answers

    Which of the following statements is true regarding the Universal Indicator?

    <p>It can indicate strong acids with a red color.</p> Signup and view all the answers

    In what way do pH meters outperform acid-base indicators?

    <p>They offer quick and consistent pH readings.</p> Signup and view all the answers

    What color change would be observed in litmus paper when exposed to an acidic solution?

    <p>It turns red.</p> Signup and view all the answers

    What is the significance of pH 7 in the context of acids and bases?

    <p>It indicates a neutral substance.</p> Signup and view all the answers

    Which improperly describes the color behavior of Red Cabbage water in a strongly basic solution?

    <p>It appears purple.</p> Signup and view all the answers

    What pH characteristics define a strong acid?

    <p>pH ranging from 1 to 2.</p> Signup and view all the answers

    What common indicator would show no color change in a neutral solution?

    <p>Litmus paper.</p> Signup and view all the answers

    Which statement about acid-base indicators is accurate?

    <p>Different indicators provide varying color responses at specific pH levels.</p> Signup and view all the answers

    What type of solution would you expect Lemon juice to be classified under?

    <p>Weak acid.</p> Signup and view all the answers

    What characteristic is unique to acidic solutions in contrast to basic solutions?

    <p>Turn blue litmus paper red</p> Signup and view all the answers

    Which of the following substances would you expect to have a pH value below 7?

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

    Which functional role do indicators serve in acid-base chemistry?

    <p>Show whether a solution is acidic or basic</p> Signup and view all the answers

    Which pH value range is indicative of weak acids?

    <p>4 to 6</p> Signup and view all the answers

    Among the following, which is a common characteristic of both acids and bases?

    <p>They can both be corrosive</p> Signup and view all the answers

    What does a pH value of 14 indicate about a substance?

    <p>The substance is very basic</p> Signup and view all the answers

    Which characteristic best describes the sensation of touching a basic solution?

    <p>Slippery and smooth</p> Signup and view all the answers

    Which of the following examples represents a neutral substance?

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

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