CEM 141-Exam 1 Questions With Correct Answers Already Passed!!

Atoms - Matter is made up of Atom - The the smallest distinguishable part of an element Theories - Can change overtime according to the evidence available Electrostatic forces - ALL atoms/molecules attract to one another due to Attractions - ________ lower potential energy of a system Repulsions - _____ raise potential energy of a system The attractive and repulsive forces are EQUAL or the potential energy is at a minimum - Stable systems form where The well - The most stable part of a graph is The strength of the inter molecular forces - The temperature of a phase change depends on ? - Why do two isolated atoms attract each other as they approach and repel after coming too close together? ? - Predict and explain the changes in the potential energy, the kinetic energy and the total energy as two isolated helium (or another noble gas) atoms approach each other. ? - Construct a diagram/picture and use it to explain how energy is transferred at the atomic level (by collisions that can either add energy to the system or remove it)? - Predict/rank the relative London Dispersion Forces between atoms and molecules of different sizes ? - ?Relate the strength of London Dispersion Forces to relative melting and boiling points for the noble gases or simple diatomic molecules (H2, N2, O2,F2, Cl2, Br2, and I2) H2, N2, O2, F2, Cl2, Br2, I2 - List all the diatomic molecules ? - Contrast the energy change that occurs when two helium atoms or two hydrogen atoms combine LDFs occur between two atoms, covalent bonding occurs IN a molecule - Differentiate between London Dispersion Forces and covalent bonding Law - Described phenomenon, tells WHAT Theory - Explains phenomenon, tells WHY Ions - Charged atoms are Positive - Protons have a ____ charge Negative - Electrons have a ____ charge Neutral - Neutrons have a ____ charge Neutral - as a WHOLE atoms have a ____ chargeScientific theory - BEST available explanation of existing evidence/data/oberservations Greeks - The ____ developed the earliest atomic theories; based philosophy