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Atomic Structure and Isotopes

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Questions and Answers

What defines an element's identity?

Atomic mass

Number of protons (correct)

Number of electrons

Number of neutrons

What is the difference between isotopes of the same element?

Atomic mass

Number of protons

Number of electrons

Number of neutrons (correct)

How is the relative atomic mass of a sample calculated?

By subtracting the number of neutrons from the atomic mass

By adding the masses of all isotopes

By dividing the atomic mass by the number of protons

By multiplying the isotope's percentage by its mass and adding the results together (correct)

What was the main discovery of Ernest Rutherford's alpha scattering experiment?

A dense, positively-charged nucleus Signup and view all the answers

What is the concept of electron shells proposed by Niels Bohr?

Electrons flying in distinct shells at different distances from the nucleus Signup and view all the answers

What is the main difference between Dalton's atomic model and J.J. Thompson's plum pudding model?

The presence of electrons Signup and view all the answers

What is Avogadro's number also known as?

6.02 x 10^23 Signup and view all the answers

What is the relative atomic mass of an atom based on?

1/12 of the mass of carbon-12 Signup and view all the answers

What is the main concept behind the law of conservation of mass?

No atoms are lost or made during a chemical reaction. Signup and view all the answers

What is the purpose of calculating the relative formula mass?

To calculate the weight of a substance Signup and view all the answers

What is the unit of concentration in quantitative chemistry?

Grams per decimeter cubed Signup and view all the answers

What is the symbol for relative formula mass?

mr Signup and view all the answers

What is the purpose of the balance symbol equation in quantitative chemistry?

To calculate the predicted yield or expected yield Signup and view all the answers

What happens to the atoms when heating up calcium carbonate?

They are released into the atmosphere and are no longer being weighed. Signup and view all the answers

What is the relationship between a decimeter cubed and a liter?

A decimeter cubed is equivalent to a liter Signup and view all the answers