12 Questions
Which scientist proposed the Law of Conservation of Energy?
Hermann von Helmholtz
What is the significance of isotopes in chemistry?
They help in determining the age of ancient artifacts.
How is atomic mass calculated?
By summing the results of multiplying each isotope's mass by its abundance.
What did Frederick Soddy propose in 1913?
The concept of isotopes
Why are valence electrons important in chemistry?
They are involved in chemical bonding and reactions.
In what year did Dmitri Mendeleev devise the first periodic table?
1869
What is electronegativity?
A measure of an atom's ability to attract and hold onto electrons in a chemical bond
Who proposed the concept of electronegativity?
Linus Pauling in 1932
What is the main difference between an ionic bond and a covalent bond?
Ionic bonds involve sharing electrons, while covalent bonds involve transferring electrons
What is the Lewis dot structure used for?
To represent the valence electrons in an atom or molecule
Who developed the concept of the Lewis dot structure?
Gilbert N. Lewis in the early 20th century
What is activation energy in a chemical reaction?
The minimum energy required for a reaction to occur
Test your knowledge on physics concepts such as the Law of Conservation of Energy, isotopes, and covalent bonds. Learn about key principles and examples in each topic.
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