CEM 141 MSU ACTUAL TEST PAPER
COMPLETE QUESTIONS AND ANSWERS
FULL SOLUTION
●● Atomic number=
Answer: Number of protons
●● Dalton's Atomic Theory
Answer: 1) Elements are composed of atoms.
2) Atoms of same 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.
●● Cathode Ray Tube
Answer: Glass tube consisting of 2 electrodes under very low pressure.
When a high voltage is applied, cathode emits "particles" that move
toward anode.
●● Thomson's Experiments showed
,Answer: 1. Particles emerge from one disc and move to the other
2. Particles could be deflected by electrical fields or magnetic fields
3. Particles carried the electrical charge
●● Number of electrons =
Answer: Number of protons
●● 4 Known fundamental forces are
Answer: Gravity, Electromagnetic, Strong Nuclear Force, and Weak
Nuclear Force.
●● The electromagnetic force is mediated by the
Answer: Electric and Magnetic Fields
●● Electromagnetic force >
Answer: Gravity
●● Coulomb's law represents
Answer: The force between charges
●● What is Energy?
Answer: We don't know but changes in energy are caused by changes in
forces.
, ●● System
Answer: Part of the universe you are looking at
●● Surroundings
Answer: Everything else in the universe
●● Kinetic Energy is energy associated with
Answer: Motion.
●● Potential Energy
Answer: 1. Energy associated with the position of system of objects in a
field.
2. Must be 2 or more objects
3. Must be a field.
●● How many atoms must be present for LDFs to exist?
Answer: 2 or more.
●● As atoms approach each other...
Answer: Potential energy decreases
COMPLETE QUESTIONS AND ANSWERS
FULL SOLUTION
●● Atomic number=
Answer: Number of protons
●● Dalton's Atomic Theory
Answer: 1) Elements are composed of atoms.
2) Atoms of same 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.
●● Cathode Ray Tube
Answer: Glass tube consisting of 2 electrodes under very low pressure.
When a high voltage is applied, cathode emits "particles" that move
toward anode.
●● Thomson's Experiments showed
,Answer: 1. Particles emerge from one disc and move to the other
2. Particles could be deflected by electrical fields or magnetic fields
3. Particles carried the electrical charge
●● Number of electrons =
Answer: Number of protons
●● 4 Known fundamental forces are
Answer: Gravity, Electromagnetic, Strong Nuclear Force, and Weak
Nuclear Force.
●● The electromagnetic force is mediated by the
Answer: Electric and Magnetic Fields
●● Electromagnetic force >
Answer: Gravity
●● Coulomb's law represents
Answer: The force between charges
●● What is Energy?
Answer: We don't know but changes in energy are caused by changes in
forces.
, ●● System
Answer: Part of the universe you are looking at
●● Surroundings
Answer: Everything else in the universe
●● Kinetic Energy is energy associated with
Answer: Motion.
●● Potential Energy
Answer: 1. Energy associated with the position of system of objects in a
field.
2. Must be 2 or more objects
3. Must be a field.
●● How many atoms must be present for LDFs to exist?
Answer: 2 or more.
●● As atoms approach each other...
Answer: Potential energy decreases
