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9/24/2026CEM 141 Module 1.pdf###############################################################################
141 Module 1.pdfCEM 141 Module 1.pdf#############################################
CEM 141 Module 1
*glass tube consisted of 2 electrodes under very low pressure.
*High voltage is applied and the cathode emits particles that move toward anode
*Particle rays bend toward + platte
*mass of particles was about 2000 times lighter than H atom (1st evidence of particle smaller
than an atom)
*type of metal that the cathode was made of did not affect the behavior of the ray, it did not
affect the type of particles (always had same madd to charge ratio
*provided evidence for atoms and substructure of atoms - ANS-Cathode Ray Tube Experiment
*Particles emerged from one disc (the cathode) and moved to the other (the anode)
*these particles could be deflected by electrical fields in a direction that would indicate they were
neg charged
*they carried the electric charge
*the metal that the cathode was made of did not affect the behavior of the ray
*all atoms contain electrons - ANS-Thompson's experiment showed
1. increases
2. decreases - ANS-What happens to the gravitational force of attraction as:
1. The mass of the interacting objects increases?
2. The distance between the objects increases?
1) Elements are composed of small indivisible, indestructible particles called atoms.
2) All atoms of an element are identical and have the same mass and properties.
3) Atoms of a given element are different from atoms of other elements.
4) Compounds are formed by combinations of atoms of two or more elements.
5) Chemical reactions are due to the rearrangements of atoms; atoms (matter) are neither
created nor destroyed during a reaction. - ANS-Dalton's Atomic Theory
2 or more - ANS-How many objected do gravitational forces require?
A push or a pull.or an interaction - ANS-What is a force?
always attractive - ANS-Grav forces are ______
An alpha particle has 2 protons and 2 neutrons.
It is the nucleus of a helium atom. overall charge 2+ - ANS-What is an alpha particle?
an element composed of atoms w a new number of protons, diff # protons, unique set of
properties - ANS-What types of evidence might be used to conclude that you had isolated a new
element?
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CEM 141 Module 1CEM 141 Module 1.pdf#######################################################################
,######################################################################################!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Q
#############################CEM
9/24/2026CEM 141 Module 1.pdf###############################################################################
141 Module 1.pdfCEM 141 Module 1.pdf#############################################
at a distance - ANS-How do electromagnetic forces act
Atoms of a given element are different from atoms of other elements. Y
Compounds are formed by combinations of atoms of two or more elements. Y
Chemical reactions are due to the rearrangements of atoms; atoms (matter) are neither created
nor destroyed during a reaction.Y - ANS-What is still true from Dalton's Atomic Theory?
attractive and repulsive - ANS-Electromagnetic fields are____
based on reacting different elements together to form compounds - ANS-How did Dalton Come
up w his theory?
Both of these interactions follow an inverse square law - ANS-what do gravitational attraction
and electrostatic forces equations have in common?
C
The ball would go thru her hand if only gravity was acting on the ball. gravity is pulling the ball
down, and electrostatic repulsive force is pushing ball up (atoms in ball and atoms in hand).
forces balance each other - ANS-Here is Katie. She has a ball in her hand. What forces are
acting on the ball? Why?
aGravitational
bElectrostatic
cBoth A and B
dThere are no forces because the ball is not moving
I don't know
change in energy - ANS-What is change in matter accompanied by?
change in force - ANS-What is change in energy caused by?
compounds are 2 or more types of elements which are chemically bonded
elements are a collection of atoms - ANS-What is the difference between an element and a
compound?
d - ANS-What is the evidence from Thomson's experiment that all atoms contain electrons?
a)The particles were attracted to the + electrode.
b)The particles were deflected by magnetic fields.
c)The particles were deflected by electrical fields.
d)The particles were identical regardless of the metal used for the cathode (where they were
emitted from).
######################################################################################!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Q
CEM 141 Module 1CEM 141 Module 1.pdf#######################################################################
#############################CEM
9/24/2026CEM 141 Module 1.pdf###############################################################################
141 Module 1.pdfCEM 141 Module 1.pdf#############################################
CEM 141 Module 1
*glass tube consisted of 2 electrodes under very low pressure.
*High voltage is applied and the cathode emits particles that move toward anode
*Particle rays bend toward + platte
*mass of particles was about 2000 times lighter than H atom (1st evidence of particle smaller
than an atom)
*type of metal that the cathode was made of did not affect the behavior of the ray, it did not
affect the type of particles (always had same madd to charge ratio
*provided evidence for atoms and substructure of atoms - ANS-Cathode Ray Tube Experiment
*Particles emerged from one disc (the cathode) and moved to the other (the anode)
*these particles could be deflected by electrical fields in a direction that would indicate they were
neg charged
*they carried the electric charge
*the metal that the cathode was made of did not affect the behavior of the ray
*all atoms contain electrons - ANS-Thompson's experiment showed
1. increases
2. decreases - ANS-What happens to the gravitational force of attraction as:
1. The mass of the interacting objects increases?
2. The distance between the objects increases?
1) Elements are composed of small indivisible, indestructible particles called atoms.
2) All atoms of an element are identical and have the same mass and properties.
3) Atoms of a given element are different from atoms of other elements.
4) Compounds are formed by combinations of atoms of two or more elements.
5) Chemical reactions are due to the rearrangements of atoms; atoms (matter) are neither
created nor destroyed during a reaction. - ANS-Dalton's Atomic Theory
2 or more - ANS-How many objected do gravitational forces require?
A push or a pull.or an interaction - ANS-What is a force?
always attractive - ANS-Grav forces are ______
An alpha particle has 2 protons and 2 neutrons.
It is the nucleus of a helium atom. overall charge 2+ - ANS-What is an alpha particle?
an element composed of atoms w a new number of protons, diff # protons, unique set of
properties - ANS-What types of evidence might be used to conclude that you had isolated a new
element?
######################################################################################!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Q
CEM 141 Module 1CEM 141 Module 1.pdf#######################################################################
,######################################################################################!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Q
#############################CEM
9/24/2026CEM 141 Module 1.pdf###############################################################################
141 Module 1.pdfCEM 141 Module 1.pdf#############################################
at a distance - ANS-How do electromagnetic forces act
Atoms of a given element are different from atoms of other elements. Y
Compounds are formed by combinations of atoms of two or more elements. Y
Chemical reactions are due to the rearrangements of atoms; atoms (matter) are neither created
nor destroyed during a reaction.Y - ANS-What is still true from Dalton's Atomic Theory?
attractive and repulsive - ANS-Electromagnetic fields are____
based on reacting different elements together to form compounds - ANS-How did Dalton Come
up w his theory?
Both of these interactions follow an inverse square law - ANS-what do gravitational attraction
and electrostatic forces equations have in common?
C
The ball would go thru her hand if only gravity was acting on the ball. gravity is pulling the ball
down, and electrostatic repulsive force is pushing ball up (atoms in ball and atoms in hand).
forces balance each other - ANS-Here is Katie. She has a ball in her hand. What forces are
acting on the ball? Why?
aGravitational
bElectrostatic
cBoth A and B
dThere are no forces because the ball is not moving
I don't know
change in energy - ANS-What is change in matter accompanied by?
change in force - ANS-What is change in energy caused by?
compounds are 2 or more types of elements which are chemically bonded
elements are a collection of atoms - ANS-What is the difference between an element and a
compound?
d - ANS-What is the evidence from Thomson's experiment that all atoms contain electrons?
a)The particles were attracted to the + electrode.
b)The particles were deflected by magnetic fields.
c)The particles were deflected by electrical fields.
d)The particles were identical regardless of the metal used for the cathode (where they were
emitted from).
######################################################################################!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Q
CEM 141 Module 1CEM 141 Module 1.pdf#######################################################################
