Understanding Atomic Mass and Carbon Isotopes

What was the original basis for the atomic mass scale?

• The mass of a helium atom

• The mass of a carbon atom

• The mass of an oxygen atom

• The mass of a hydrogen atom

Why is carbon-12 chosen as the standard for atomic mass units?

• It is the lightest isotope

• It has the most neutrons

• It is the most abundant isotope

• It is the heaviest isotope

What is the main reason for using carbon-12 as a standard in atomic mass?

• It is the most reactive isotope

• It has the most protons

• It is universally abundant

• It is the lightest isotope

What is the relative atomic mass of carbon considering its isotopes?

• 12.00

• 12.01

• 14.00

• 13.00

What percentage of naturally occurring carbon is carbon-12?

• 100%

• 99%

• 75%

• 50%

Which isotope of carbon is least abundant in nature?

• Carbon-14

• Carbon-13

• Carbon-12

• Carbon-15

How do carbon isotopes differ in chemical reactions?

• They have different bonding patterns

• They do not react with oxygen

• They form different compounds

• They behave the same way

What is the role of neutrons in the chemical behavior of carbon isotopes?

• They affect the isotope's bonding

• They determine the isotope's reactivity

• They do not influence chemical behavior

• They change the isotope's color

How is carbon-14 formed in the atmosphere?

• By the splitting of carbon-13

• By the decay of carbon-12

• By cosmic rays interacting with nitrogen

• By the fusion of hydrogen atoms

What is the significance of carbon-14 in scientific studies?

• It is a source of carbon dioxide

• It is used in energy production

• It helps in determining the age of fossils

• It is used to measure temperature