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CEM 141 MSU EXAM 3 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CEM 141 MSU EXAM 3 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CEM 141 MSU EXAM 3 QUESTIONS ANDANSWERS WITH SOLUTIONS 2024
Ionization Energy - ANSWER energy required to remove an electron from an atom in the gas phase
Left Side Electrons - ANSWER have weaker attractions to remove electrons
*easier to remove electrons from the left side of the table than the right side*
Does it take MORE or LESS energy to remove an electron from Li than from Na? - ANSWER MORE
Why? Because as we move down a group, the orbitals become larger and weaker. While going across the
effective nuclear charge increases. (holds onto the electrons tighter)
Big Bang evidence - ANSWER universe is expanding (red shift)
Where do atoms come from? - ANSWER The Big Bang
What were elements formed by? - ANSWER Nuclear reactions
Chemical reactions - ANSWER involve rearrangements of valence electrons
*the element undergoing a chemical reaction does not ever change*
Ionization energies are affected by - ANSWER -size of an atom
-size of positive charge
Periodic Trends - ANSWER -small atoms have higher ionization energies
-they are inversely related
Atomic Radius Decreases ----> Ionization energy increases - ANSWER when the radius decreases, it pulls
the electrons closer. decreasing the size of an atom
, Nuclear Reactions - ANSWER Fusion and Fission
Fusion - ANSWER two lighter nuclei combines to form a heavier nucleus (energy released)
Fission - ANSWER a heavier nucleus is broken a part to form lighter, more stable nuclei energy
Atomic # = - ANSWER # of protons
Atomic mass = - ANSWER what's left over
Do isolated atoms or molecules have melting or boiling points? - ANSWER No
Do isolated atoms or molecules exist in a state (solid, liquid, gas)? - ANSWER No
Why do bonds form between atoms? - ANSWER because valence electrons are attracted to the nuclei of
other atoms
Covalent Bonds - ANSWER two hydrogen atoms interact and form a covalent bond
What properties do metals have? - ANSWER -hard
-conduct electricity
-shiny
-react w/water
-malleable
Bonding in Metals - ANSWER atomic orbitals combine with each other to form molecular orbitals
Covalent bonds hold atoms together within.. - ANSWER molecules
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