18 Questions
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?
A dense, positively-charged nucleus
What is the concept of electron shells proposed by Niels Bohr?
Electrons flying in distinct shells at different distances from the nucleus
What is the main difference between Dalton's atomic model and J.J. Thompson's plum pudding model?
The presence of electrons
What is Avogadro's number also known as?
6.02 x 10^23
What is the relative atomic mass of an atom based on?
1/12 of the mass of carbon-12
What is the main concept behind the law of conservation of mass?
No atoms are lost or made during a chemical reaction.
What is the purpose of calculating the relative formula mass?
To calculate the weight of a substance
What is the unit of concentration in quantitative chemistry?
Grams per decimeter cubed
What is the symbol for relative formula mass?
mr
What is the purpose of the balance symbol equation in quantitative chemistry?
To calculate the predicted yield or expected yield
What happens to the atoms when heating up calcium carbonate?
They are released into the atmosphere and are no longer being weighed.
What is the relationship between a decimeter cubed and a liter?
A decimeter cubed is equivalent to a liter
What is the name of the molecule made up of 60 carbon atoms joined together?
Buckminsterfullerene
What is silicon dioxide also known as?
Silica
What is the first step in calculating the moles of a substance?
Determining the relative formula mass
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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