CEM 141-Exam 1 Latest Update Already Graded A

CEM 141-Exam 1 Latest Update Already Graded A Matter is made up of Atoms The the smallest distinguishable part of an element Atom Can change overtime according to the evidence available Theories ALL atoms/molecules attract to one another due to Electrostatic forces ________ lower potential energy of a system Attractions _____ raise potential energy of a system Repulsions Stable systems form where The attractive and repulsive forces are EQUAL or the potential energy is at a minimum The most stable part of a graph is The well The temperature of a phase change depends on The strength of the inter molecular forces 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) ? List all the diatomic molecules H2, N2, O2, F2, Cl2, Br2, I2 Contrast the energy change that occurs when two helium atoms or two hydrogen atoms combine ? Differentiate between London Dispersion Forces and covalent bonding LDFs occur between two atoms, covalent bonding occurs IN a molecule Described phenomenon, tells WHAT Law