Atomic Structure and Isotopes
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Atomic Structure and Isotopes

Learn about the structure of atoms, isotopes, and how to calculate relative atomic mass. Understand the concept of isotopes with different numbers of neutrons and protons, and how it affects the atomic mass of an element.

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@JovialTransformation

Questions and Answers

What defines an element's identity?

Number of protons

What is the difference between isotopes of the same element?

Number of neutrons

How is the relative atomic mass of a sample calculated?

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

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

<p>A dense, positively-charged nucleus</p> Signup and view all the answers

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

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

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

<p>The presence of electrons</p> Signup and view all the answers

What is Avogadro's number also known as?

<p>6.02 x 10^23</p> Signup and view all the answers

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

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

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

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

What is the purpose of calculating the relative formula mass?

<p>To calculate the weight of a substance</p> Signup and view all the answers

What is the unit of concentration in quantitative chemistry?

<p>Grams per decimeter cubed</p> Signup and view all the answers

What is the symbol for relative formula mass?

<p>mr</p> Signup and view all the answers

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

<p>To calculate the predicted yield or expected yield</p> Signup and view all the answers

What happens to the atoms when heating up calcium carbonate?

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

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

<p>A decimeter cubed is equivalent to a liter</p> Signup and view all the answers

What is the name of the molecule made up of 60 carbon atoms joined together?

<p>Buckminsterfullerene</p> Signup and view all the answers

What is silicon dioxide also known as?

<p>Silica</p> Signup and view all the answers

What is the first step in calculating the moles of a substance?

<p>Determining the relative formula mass</p> Signup and view all the answers

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