Gr 10 Physical Sciences Ch 2: Isotopes
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Questions and Answers

What is the origin of the term 'isotope'?

  • From the German words 'iso' and 'topos'
  • From the Latin words 'iso' and 'topos'
  • From the French words 'iso' and 'topos'
  • From the Greek words 'iso' and 'topos' (correct)

What is the characteristic that is identical in isotopes of an element?

  • Number of protons
  • Atomic mass number
  • Chemical properties (correct)
  • Physical properties

How are isotopes often represented?

  • Using the element symbol and atomic mass number (correct)
  • Using the element symbol and number of neutrons
  • Using the element symbol and atomic number
  • Using the element symbol and number of electrons

What is the reason for the difference in physical properties of isotopes?

<p>Difference in number of neutrons (D)</p> Signup and view all the answers

What is the average atomic mass of an element influenced by?

<p>The relative abundance of its isotopes (B)</p> Signup and view all the answers

What is the formula to calculate the average atomic mass of an element with multiple isotopes?

<p>Average Atomic Mass = (Atomic Mass of Isotope 1 × % Isotope 1) + (Atomic Mass of Isotope 2 × % Isotope 2) (C)</p> Signup and view all the answers

What is the percentage of Cl-35 in chlorine atoms?

<p>75% of chlorine atoms (D)</p> Signup and view all the answers

What is the symbol for the isotope of chlorine with 17 protons and 18 neutrons?

<p>Cl-35 (C)</p> Signup and view all the answers

What is the primary reason why isotopes occupy the same place on the periodic table?

<p>They have the same number of protons. (B)</p> Signup and view all the answers

What is the difference between the atomic mass number of Cl-35 and Cl-37?

<p>2 u (B)</p> Signup and view all the answers

What is the effect of different neutrons on the physical properties of isotopes?

<p>It affects the stability. (C)</p> Signup and view all the answers

What is the purpose of calculating the average atomic mass of an element?

<p>To take into account the relative abundances of its isotopes. (A)</p> Signup and view all the answers

What would happen if an element had only one isotope?

<p>The average atomic mass would be equal to the atomic mass of the isotope. (A)</p> Signup and view all the answers

Why do isotopes of an element have the same chemical properties?

<p>Because they have the same number of protons and electrons. (D)</p> Signup and view all the answers

What would be the result of miscalculating the relative abundance of an isotope?

<p>An incorrect average atomic mass would be calculated. (B)</p> Signup and view all the answers

What is the importance of considering the relative abundance of isotopes in calculating the average atomic mass?

<p>To accurately reflect the weighted average of the atomic masses of the isotopes. (C)</p> Signup and view all the answers

What is the main reason why isotopes of an element have different physical properties?

<p>Difference in the number of neutrons (C)</p> Signup and view all the answers

What is the significance of the atomic mass number in isotopes?

<p>It represents the total number of nucleons in the nucleus (C)</p> Signup and view all the answers

Why do chlorine atoms have an average atomic mass that is not a whole number?

<p>Because chlorine has different isotopes with different atomic masses (D)</p> Signup and view all the answers

What is the purpose of calculating the relative abundance of isotopes?

<p>To calculate the average atomic mass of an element (B)</p> Signup and view all the answers

What would be the effect of an element having only one isotope?

<p>The element would have an average atomic mass that is a whole number (C)</p> Signup and view all the answers

Why do isotopes of an element have the same place on the periodic table?

<p>Because they have the same number of protons and electrons (B)</p> Signup and view all the answers

What would happen if the relative abundance of an isotope were miscalculated?

<p>The average atomic mass of the element would be incorrect (B)</p> Signup and view all the answers

What is the reason why the atomic mass of an element is not always an integer?

<p>Because the element has different isotopes (D)</p> Signup and view all the answers

What is the primary reason why isotopes of an element have different atomic mass numbers?

<p>Different number of neutrons (B)</p> Signup and view all the answers

Which of the following statements is true about isotopes of an element?

<p>They have different chemical properties due to different numbers of neutrons (D)</p> Signup and view all the answers

What is the result of considering the relative abundance of isotopes in calculating the average atomic mass of an element?

<p>The calculated average atomic mass is affected by the atomic mass number of the most abundant isotope (D)</p> Signup and view all the answers

What is the main purpose of distinguishing between isotopes of an element?

<p>To understand the physical properties and abundance of the element (D)</p> Signup and view all the answers

Which of the following is a consequence of isotopes occupying the same place on the periodic table?

<p>They have the same atomic number (A)</p> Signup and view all the answers

What is the effect of the number of neutrons on the chemical properties of isotopes?

<p>It has no effect on the chemical properties (C)</p> Signup and view all the answers

How does the relative abundance of isotopes influence the average atomic mass of an element?

<p>It affects the average atomic mass proportionally to the abundance (C)</p> Signup and view all the answers

What is the relationship between the atomic mass number and the number of neutrons in an isotope?

<p>The atomic mass number is the sum of protons and neutrons (B)</p> Signup and view all the answers

What is the main difference between isotopes of an element?

<p>Number of neutrons (B)</p> Signup and view all the answers

Why do isotopes of an element have identical chemical properties?

<p>Because they have the same number of protons and electrons (C)</p> Signup and view all the answers

What is the purpose of calculating the average atomic mass of an element?

<p>To account for the relative abundance of isotopes in an element (D)</p> Signup and view all the answers

What is the relative abundance of Cl-35 in chlorine atoms?

<p>75% (D)</p> Signup and view all the answers

What is the effect of having different numbers of neutrons on isotopes?

<p>Different physical properties (A)</p> Signup and view all the answers

What is the result of calculating the average atomic mass of an element with multiple isotopes?

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

Why do isotopes of an element occupy the same place on the periodic table?

<p>Because they have the same number of protons (C)</p> Signup and view all the answers

What is the significance of the atomic mass number in isotopes?

<p>It represents the sum of protons and neutrons (C)</p> Signup and view all the answers

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