CEM 141 Final Exam With Latest
Question & Answer
Matter is made of _____ - ANSWER//Atoms
____ are the smallest distinguishable part of an element. - ANSWER//Atoms
________lower the potential energy of a system, and _________ tend to raise the
potential energy. - ANSWER//attractions and repulsions
________ change over time according to the evidence available. -
ANSWER//theories
All atoms/molecules attract each other because of the attractive
_________________ between them. - ANSWER//electromagnetic forces
_________ form where the attractive forces and the repulsive forces are equal. -
ANSWER//stable systems
____________of a phase change depends on the strength of the intermolecular
forces. - ANSWER//the temperature
While constructing a scientific explanation you need 3 things? - ANSWER//claim,
evidence and reasoning
a ____ describes the phenomenon - ANSWER//law
a ______ explains the phenomenon - ANSWER//theory
the # of ______ distinguishes one element for another - ANSWER//protons
_____ is the smallest unit of an element - ANSWER//atom
Why was daltons atomic theory wrong? - ANSWER//Because elements are not
composed of small indivisible indestructible particles called atoms. All atoms of
an element are not identical.
______ its a different type of elements but with a different number of neutrons. -
ANSWER//Isomers
Which subatomic particle was discovered first? - ANSWER//electrons
,Why was the electron the first subatomic particle discovered? -
ANSWER//because it is a charged particle on the outer layers of the atom
Who discovered the electron? - ANSWER//Thompson
How did Thompson discover the electron? - ANSWER//The cathode ray tube
experiment. Electrons are shot through the metal and when they introduced the
metal plate (positive and negative). The ray was attracted towards the positively
charged plates, therefore, there has to be something negatively charged within
the ray.
Thompsons experiment showed that the particles being shot carried an
____________ - ANSWER//electrical charge
Thompsons experiment also showed that the type of ____ had no affect on the
behavior of the ray - ANSWER//metal
Thompsons _____________ atom model showed that atoms contain electrons
embedded in the positvely charged atom. - ANSWER//plum pudding model
Core principle of the atomic theory is that the idea that _____ is composed of
______ - ANSWER//matter is composed of atoms
Root of atomic theories is from? - ANSWER//the greeks
What did Ernest Rutherford's gold foil experiment show? - ANSWER//They shot
alpha particles at gold foil and the particles went through but every once and a
while a particle was shot back. Through this they realized that most of the atom is
made up of empty space. There must be something small and hard that the
particles are hitting.
How did the Rutherford experiment change the Thompson model? - ANSWER//If
the atom was like a plum pudding all the alpha particles should go straight
through. But some reflect therefore an atom is mostly empty space with a hard
positively charged nucleus.
what is an alpha particle? - ANSWER//2 protons and 2 neutrons
Neutrons are harder to detect because they are ______ - ANSWER//neutral in
charge
coulombs law? - ANSWER//positive and negative charges attract like charges
repel
What is a force? - ANSWER//a push or pull
, If you ______ the mass the gravitational force will _____ - ANSWER//increase and
increase
If you ______ the mass the gravitational force will ______ - ANSWER//decrease
and decrease
If you ______ the distance the force will ________ - ANSWER//increase and
decrease
If you _______ the distance the force will _______ - ANSWER//decrease and
increase
gravitational forces are mediated by _____. They require __________ and are
always ______ - ANSWER//fields. 2 or more objects and are always attractive
The electromagnetic force is mediated by _____ and ______ feilds -
ANSWER//electric and magnetic
the _________ is much stronger than gravity and can be both attractive and
repulsive - ANSWER//electromagnetic
The __________ stops us from falling through the earth - ANSWER//electrostatic
If something is not moving either there is ________ acting on it or the forces
acting on it are ______ - ANSWER//no force and equal
When something is not moving it means the force of ____ is equal to the ______
force - ANSWER//gravity and electromagnetic
____ is the part of the universe you are looking at - ANSWER//system
______ everything else in the universe - ANSWER//surrondings
_____ is never lost it is either transferred or transformed - ANSWER//energy
two types of Energy? - ANSWER//kinetic and potential
?= 1/2mv2 - ANSWER//kinetic energy
energy is associated with the position of a system of objects in a _____ -
ANSWER//field
You can't have __________ without a field or 2 or more objects -
ANSWER//potential energy
_____ is stored in the field not the object - ANSWER//potential energy
Question & Answer
Matter is made of _____ - ANSWER//Atoms
____ are the smallest distinguishable part of an element. - ANSWER//Atoms
________lower the potential energy of a system, and _________ tend to raise the
potential energy. - ANSWER//attractions and repulsions
________ change over time according to the evidence available. -
ANSWER//theories
All atoms/molecules attract each other because of the attractive
_________________ between them. - ANSWER//electromagnetic forces
_________ form where the attractive forces and the repulsive forces are equal. -
ANSWER//stable systems
____________of a phase change depends on the strength of the intermolecular
forces. - ANSWER//the temperature
While constructing a scientific explanation you need 3 things? - ANSWER//claim,
evidence and reasoning
a ____ describes the phenomenon - ANSWER//law
a ______ explains the phenomenon - ANSWER//theory
the # of ______ distinguishes one element for another - ANSWER//protons
_____ is the smallest unit of an element - ANSWER//atom
Why was daltons atomic theory wrong? - ANSWER//Because elements are not
composed of small indivisible indestructible particles called atoms. All atoms of
an element are not identical.
______ its a different type of elements but with a different number of neutrons. -
ANSWER//Isomers
Which subatomic particle was discovered first? - ANSWER//electrons
,Why was the electron the first subatomic particle discovered? -
ANSWER//because it is a charged particle on the outer layers of the atom
Who discovered the electron? - ANSWER//Thompson
How did Thompson discover the electron? - ANSWER//The cathode ray tube
experiment. Electrons are shot through the metal and when they introduced the
metal plate (positive and negative). The ray was attracted towards the positively
charged plates, therefore, there has to be something negatively charged within
the ray.
Thompsons experiment showed that the particles being shot carried an
____________ - ANSWER//electrical charge
Thompsons experiment also showed that the type of ____ had no affect on the
behavior of the ray - ANSWER//metal
Thompsons _____________ atom model showed that atoms contain electrons
embedded in the positvely charged atom. - ANSWER//plum pudding model
Core principle of the atomic theory is that the idea that _____ is composed of
______ - ANSWER//matter is composed of atoms
Root of atomic theories is from? - ANSWER//the greeks
What did Ernest Rutherford's gold foil experiment show? - ANSWER//They shot
alpha particles at gold foil and the particles went through but every once and a
while a particle was shot back. Through this they realized that most of the atom is
made up of empty space. There must be something small and hard that the
particles are hitting.
How did the Rutherford experiment change the Thompson model? - ANSWER//If
the atom was like a plum pudding all the alpha particles should go straight
through. But some reflect therefore an atom is mostly empty space with a hard
positively charged nucleus.
what is an alpha particle? - ANSWER//2 protons and 2 neutrons
Neutrons are harder to detect because they are ______ - ANSWER//neutral in
charge
coulombs law? - ANSWER//positive and negative charges attract like charges
repel
What is a force? - ANSWER//a push or pull
, If you ______ the mass the gravitational force will _____ - ANSWER//increase and
increase
If you ______ the mass the gravitational force will ______ - ANSWER//decrease
and decrease
If you ______ the distance the force will ________ - ANSWER//increase and
decrease
If you _______ the distance the force will _______ - ANSWER//decrease and
increase
gravitational forces are mediated by _____. They require __________ and are
always ______ - ANSWER//fields. 2 or more objects and are always attractive
The electromagnetic force is mediated by _____ and ______ feilds -
ANSWER//electric and magnetic
the _________ is much stronger than gravity and can be both attractive and
repulsive - ANSWER//electromagnetic
The __________ stops us from falling through the earth - ANSWER//electrostatic
If something is not moving either there is ________ acting on it or the forces
acting on it are ______ - ANSWER//no force and equal
When something is not moving it means the force of ____ is equal to the ______
force - ANSWER//gravity and electromagnetic
____ is the part of the universe you are looking at - ANSWER//system
______ everything else in the universe - ANSWER//surrondings
_____ is never lost it is either transferred or transformed - ANSWER//energy
two types of Energy? - ANSWER//kinetic and potential
?= 1/2mv2 - ANSWER//kinetic energy
energy is associated with the position of a system of objects in a _____ -
ANSWER//field
You can't have __________ without a field or 2 or more objects -
ANSWER//potential energy
_____ is stored in the field not the object - ANSWER//potential energy
