Gr 9 NATURAL SCIENCES: HFST 2.5 What is the pH value?
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Questions and Answers

What is the pH value of a neutral substance?

  • Zero
  • Equal to 7 (correct)
  • Above 7
  • Below 7

What is the characteristic of acids that can be used to distinguish them from bases?

  • Taste sour and feel rough (correct)
  • Can be corrosive
  • Taste bitter and feel slippery
  • Turn blue litmus red

What is the function of an indicator in a solution?

  • To neutralize the solution
  • To change the pH of the solution
  • To show whether the solution is acidic or basic (correct)
  • To make the solution corrosive

What is the pH range of the pH scale?

<p>1 to 14 (C)</p> Signup and view all the answers

Who first described the term 'pH' in 1909?

<p>Søren Peter Lauritz Sørensen (B)</p> Signup and view all the answers

Which of the following is an example of a base?

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

What does 'pH' stand for?

<p>Power of Hydrogen (B)</p> Signup and view all the answers

What is the pH of a neutral substance?

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

Which of the following is an example of a strong acid?

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

What is used to measure the pH of a solution?

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

Which of the following is a characteristic of both acids and bases?

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

What does a pH value of 7 indicate?

<p>A neutral substance (A)</p> Signup and view all the answers

What is the purpose of an indicator in a solution?

<p>To show whether the solution is acidic or basic (A)</p> Signup and view all the answers

What is the pH range of acidic substances?

<p>Below 7 (C)</p> Signup and view all the answers

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

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

What is the main difference between lemon juice and orange juice in terms of pH?

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

Why is it important to maintain the right pH in swimming pool water?

<p>To ensure the water is neutral. (A)</p> Signup and view all the answers

What is the characteristic of a strong acid?

<p>It has a pH close to 1. (D)</p> Signup and view all the answers

What is the purpose of 'pH balanced' shampoo?

<p>To make the shampoo neutral, matching the pH of the hair. (A)</p> Signup and view all the answers

What is the relationship between the pH of a substance and its acidity?

<p>As the pH increases, the substance becomes more basic. (B)</p> Signup and view all the answers

What is the primary reason why lemon juice has a lower pH than orange juice?

<p>Lemon juice has a higher concentration of hydrogen ions (C)</p> Signup and view all the answers

What is the purpose of maintaining a neutral pH in skin soap?

<p>To balance the pH of the skin (D)</p> Signup and view all the answers

What happens to the pH of a substance as it becomes more basic?

<p>The pH increases towards 14 (A)</p> Signup and view all the answers

Why is it important to monitor the pH of swimming pool water?

<p>To ensure the water is within a safe range for swimmers (D)</p> Signup and view all the answers

What is the relationship between the pH of a substance and its strength as an acid or base?

<p>A stronger acid has a lower pH, and a stronger base has a higher pH (A)</p> Signup and view all the answers

What is the primary purpose of using an indicator in a solution?

<p>To identify whether the solution is acidic or basic (D)</p> Signup and view all the answers

What is the characteristic that distinguishes acidic taste from basic taste?

<p>Sour taste indicates an acid, while bitter taste indicates a base (C)</p> Signup and view all the answers

What happens to the pH value of a solution when an acid is added to it?

<p>The pH value decreases (B)</p> Signup and view all the answers

What is the relationship between the feel of a substance and its classification as an acid or base?

<p>Acids feel rough, while bases feel slippery (D)</p> Signup and view all the answers

What is the range of pH values for neutral substances?

<p>pH 7 only (A)</p> Signup and view all the answers

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