General Physical and Colloid Chemistry Key Points Quiz

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Questions and Answers

Who proposed the concept of atoms in the fifth century BC?

John Dalton
Selyutin Artem
Aristotle
Leucippus and Democritus (correct)

Which English schoolteacher proposed his atomic theory in 1807?

Aristotle
Democritus
John Dalton (correct)
Leucippus

What distinguishes the chemical elements from each other?

Number of protons (correct)
Kinetic-Molecular Theory
Number of neutrons
Atomic mass

What are forms of an element that have different numbers of neutrons called?

Isotopes (D) Signup and view all the answers

What is the basic particle of the chemical elements?

Atom (D) Signup and view all the answers

Which of the following statements best describes an ion?

An ion is a charged particle due to an unbalanced electron/proton numbers (B) Signup and view all the answers

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 (D) Signup and view all the answers

What is the empirical formula of acetic acid?

C2H4O2 (B) Signup and view all the answers

What type of model can be used to represent a methane molecule with carbon and hydrogen atoms as spheres?

Ball-and-stick model (C) Signup and view all the answers

How many copper atoms are approximately present in a pre-1982 copper penny?

$3 \times 10^{22}$ (B) Signup and view all the answers