10 Questions
Who proposed the concept of atoms in the fifth century BC?
Leucippus and Democritus
Which English schoolteacher proposed his atomic theory in 1807?
John Dalton
What distinguishes the chemical elements from each other?
Number of protons
What are forms of an element that have different numbers of neutrons called?
Isotopes
What is the basic particle of the chemical elements?
Atom
Which of the following statements best describes an ion?
An ion is a charged particle due to an unbalanced electron/proton numbers
According to Dalton’s atomic theory, what does an element consist of?
An element consists of only one type of atom, which has a mass characteristic of the element and is the same for all atoms of that element
What is the empirical formula of acetic acid?
C2H4O2
What type of model can be used to represent a methane molecule with carbon and hydrogen atoms as spheres?
Ball-and-stick model
How many copper atoms are approximately present in a pre-1982 copper penny?
$3 \times 10^{22}$
Test your knowledge on key points in General Physical and Colloid Chemistry including Early Ideas in Atomic Theory, Evolution of Atomic Theory, Atomic Structure, Chemical Formulas, Gas Laws, Ideal-Gas and Real-Gas Equations, and Kinetic-Molecular Theory.
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