CEM 141 Exam Latest Updated Questions with 100%
Complete Solutions
Where did the original idea of atoms come from?
The greeks
Was the earliest atomic theory scientific (based on experiments, data, and evidence)?
No, it was based on philosophy
What was the greek philosopher's earliest atomic theory based on?
They observed dust motes in sunlight and concluded atoms were in constant motion with voids
between them.
What did Ancient Greek philosophers believe about matter?
That it could be divided into smaller and smaller pieces until you reach the smallest piece, the
atom
What is the random motion of atoms and particles called?
brownian motion
Why do atoms constantly change direction?
atoms are in constant motion and collide with each other, causing direction changes.
What did the greeks believe determined the properties of atoms?
their shape
What determines the properties of molecules?
, The shape and polarity of the molecule
which greek ideas about atoms are still valid today?
1) Atoms of different types of different
2) Atoms are in constant motion
3) Atoms exist.
If atoms are in constant motion, what keeps them moving?
thermal energy
What is the smallest unit of an element
an atom
How are atoms of different elements different from one another?
They are different from one another in terms of their atomic number (# of protons)
What is the difference between an atom and an element?
Atom= an atom is the building block of matter, an individual nanoscale entity.
Element= a collection of atoms, forming a macroscopic sample with observable properties
What is an atom of an element
a single unit of an element
What is a molecule of an element
Two or more atoms of the same element bonded together
What is a molecule of a compound
Complete Solutions
Where did the original idea of atoms come from?
The greeks
Was the earliest atomic theory scientific (based on experiments, data, and evidence)?
No, it was based on philosophy
What was the greek philosopher's earliest atomic theory based on?
They observed dust motes in sunlight and concluded atoms were in constant motion with voids
between them.
What did Ancient Greek philosophers believe about matter?
That it could be divided into smaller and smaller pieces until you reach the smallest piece, the
atom
What is the random motion of atoms and particles called?
brownian motion
Why do atoms constantly change direction?
atoms are in constant motion and collide with each other, causing direction changes.
What did the greeks believe determined the properties of atoms?
their shape
What determines the properties of molecules?
, The shape and polarity of the molecule
which greek ideas about atoms are still valid today?
1) Atoms of different types of different
2) Atoms are in constant motion
3) Atoms exist.
If atoms are in constant motion, what keeps them moving?
thermal energy
What is the smallest unit of an element
an atom
How are atoms of different elements different from one another?
They are different from one another in terms of their atomic number (# of protons)
What is the difference between an atom and an element?
Atom= an atom is the building block of matter, an individual nanoscale entity.
Element= a collection of atoms, forming a macroscopic sample with observable properties
What is an atom of an element
a single unit of an element
What is a molecule of an element
Two or more atoms of the same element bonded together
What is a molecule of a compound
