MSU CEM 141 FINAL STUDY GUIDE Actual Questions with Detailed Answers

MSU CEM 141 FINAL STUDY GUIDE Actual Questions with
Detailed Answers

Question 1.
Scientific Questions can be answered by...

Correct Answer: -Doing experiments -Making observations -Taking
measurements


Question 2.
Atomic number=

Correct Answer: Number of protons


Question 3.
Dalton's Atomic Theory

Correct 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.


Question 4.
Cathode Ray Tube

Correct Answer: Glass tube consisting of 2 electrodes under very low pressure.
When a high voltage is applied, cathode emits "particles" that move toward
anode.


Question 5.
Thomson's Experiments showed

Correct 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


Question 6.
Number of electrons =

Correct Answer: Number of protons

,Question 7.
4 Known fundamental forces are

Correct Answer: Gravity, Electromagnetic, Strong Nuclear Force, and Weak
Nuclear Force.


Question 8.
The electromagnetic force is mediated by the

Correct Answer: Electric and Magnetic Fields


Question 9.
Electromagnetic force >

Correct Answer: Gravity


Question 10.
Coulomb's law represents

Correct Answer: The force between charges


Question 11.
What is Energy?

Correct Answer: We don't know but changes in energy are caused by changes in
forces.


Question 12.
System

Correct Answer: Part of the universe you are looking at


Question 13.
Surroundings

Correct Answer: Everything else in the universe


Question 14.
Kinetic Energy is energy associated with

Correct Answer: Motion.

, Question 15.
Potential Energy

Correct 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.


Question 16.
How many atoms must be present for LDFs to exist?

Correct Answer: 2 or more.


Question 17.
As atoms approach each other...

Correct Answer: Potential energy decreases


Question 18.
When atoms overlap

Correct Answer: Potential energy increases


Question 19.
What happens when you add thermal energy to the He atoms?

Correct Answer: 1. Kinetic energy increases, they move faster, they collide and
vibrate with more energy.
2. Once they vibrate to a certain point they fly apart


Question 20.
Thermal Energy is

Correct Answer: A measure of the average kinetic energy of the atoms.


Question 21.
Temperature is

Correct Answer: Directly related to average kinetic energy.


Question 22.
What happens when you break an interaction between atoms?

Correct Answer: Energy is absorbed into the system.