Chromatography and Relative Mass - Entry

Which of the following is a type of chromatography that can be used to separate components of a mixture based on their polarity?

• Thin layer chromatography

• High performance liquid chromatography

• Paper chromatography

• All of the above

What is the mobile phase in HPLC?

• Column

• Liquid

• Adsorbent

• Detector

What is the purpose of using a reference substance in chromatography?

• To calibrate the instrument

• To identify an unknown substance

• To measure the retention time or factor

• All of the above

What is a disadvantage of using paper chromatography compared to thin layer chromatography?

• Paper chromatography is less sensitive

• Paper chromatography is more expensive

• Paper chromatography is more dangerous

• All of the above

What is a common application of HPLC?

• Separating proteins and peptides

• Detecting drugs and toxins in biological samples

• Analysing food additives and contaminants

• All of the above

What is relative atomic mass?

• The mass of an atom relative to 1/12 of the mass of an atom of Carbon-12

• The mass of a compound relative to 1/12 of the mass of an atom of Carbon-12

• The sum of the raltive masses of the atoms in a molecule

How is relative atomic mass determined?

• By assigning the relative isotopic mass of carbon-12 as 12 and finding the relative abundance of each isotope

• By determining the number of protons and neutrons in an atom

• By determining the number of electrons in an atom

What is relative molecular mass?

• The sum of all electrons in a molecule

• The sum of the relative atomic masses of all atoms in a molecule

• The sum of all protons and neutrons in a molecule