atoms, molecules and ions 3
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Questions and Answers

What is the significance of Oxygen-18 in paleoclimatology?

  • Calculating the amount of nitrogen in the atmosphere
  • Studying the history of volcanic eruptions
  • Determining the temperature of precipitation over time (correct)
  • Measuring the acidity of rainwater

What field did Mildred Cohn pioneer the usage of isotopes in?

  • Chemical warfare
  • Environmental conservation
  • Medicine (correct)
  • Biological weapons

How are cations formed in a mass spectrometer?

  • By gaining one or more electrons
  • By absorbing light particles
  • By losing one or more electrons (correct)
  • By reacting with oxygen molecules

What happens to cations in a mass spectrometer after being charged?

<p>They are deflected based on mass and charge (A)</p> Signup and view all the answers

Which isotope of zirconium has the highest relative abundance?

<p>ZR 90 (A)</p> Signup and view all the answers

What is the role of a mass spectrometer in chemical analysis?

<p>Identifying mixtures of substances (D)</p> Signup and view all the answers

How does a mass spectrometer detect ions?

<p>By deflecting their path based on mass and charge (C)</p> Signup and view all the answers

What does a mass spectrum plot show?

<p>The relative number of ions versus their mass-to-charge ratios (A)</p> Signup and view all the answers

What contribution did Mass Spectrometry make to modern atomic theory?

<p>'Mass-to-charge ratio' concept was introduced (B)</p> Signup and view all the answers

What is the significance of Oxygen-18 in paleoclimatology?

<p>Determining the temperature of precipitation over time (A)</p> Signup and view all the answers

How does a mass spectrometer work in terms of analyzing samples?

<p>By heating the sample to create ions and then deflecting the ions based on their mass and charge (A)</p> Signup and view all the answers

What was Mildred Cohn's contribution to using isotopes?

<p>Tracing isotopes to understand chemical reactions (D)</p> Signup and view all the answers

How are ions detected in a mass spectrometer?

<p>By measuring the height of peaks in a mass spectrum (D)</p> Signup and view all the answers

What is the role of a mass spectrometer in environmental science?

<p>Analyzing pollutants in air samples (C)</p> Signup and view all the answers

What makes Oxygen-18 important for studying metabolic pathways?

<p>Its stability as a naturally occurring isotope (C)</p> Signup and view all the answers

What field benefits from using isotopes as tracers?

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

How does mass spectrometry contribute to forensic science?

<p>By identifying unique chemical markers on evidence (C)</p> Signup and view all the answers

Which statement accurately describes the process in a mass spectrometer?

<p>Charged particles are deflected based on their mass-to-charge ratio. (A)</p> Signup and view all the answers

What is the role of Oxygen-18 in paleoclimatology?

<p>Determining the temperature of precipitation over time.</p> Signup and view all the answers

How did Mildred Cohn contribute to the field of isotopes?

<p>She pioneered the usage of isotopes as tracers.</p> Signup and view all the answers

What is the most abundant isotope of zirconium?

<p>ZR 90</p> Signup and view all the answers

What is the significance of mass spectrometry in chemical analysis?

<p>It is a powerful tool for analyzing substances in a sample.</p> Signup and view all the answers

How do mass spectrometers work in terms of detecting ions?

<p>Charged particles from the sample are deflected by a magnetic field based on their mass and charge.</p> Signup and view all the answers

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