NEMCC physical science II midterm questions with
verified answers
"-ide" rule of compounds Ans✓✓✓Compound contains only two dif
elements
3 types of chemical bonds Ans✓✓✓Ionic- electrons transferred
between atoms; electrostatic force=binding force; ex.) NaCl
Covalent- octets achieved through sharing electrons; usually btwn
nonmetallics
Metallic- outer electrons move freely throughout metal; "electron gas"
w/in rigid lattice of metal atoms; conduct heat and electricity well
Alcohols Ans✓✓✓Have one or more hydroxyl functional groups
Alkanes Ans✓✓✓Hydrocarbons w/ all single carbon-carbon bonds
Straight chains
Branches and rings
Alkene Ans✓✓✓Hydrocarbons w/ double carbon-carbon bond
Unsaturated
Simplest = ethylene
Alkynes Ans✓✓✓Hydrocarbons w/ a triple carbon-carbon bond
Simplest = acetylene
, All of the naturally occurring radioactive decay series end when the
radioactive elements have decayed to __________ Ans✓✓✓Lead
Alpha emission Ans✓✓✓Expulsion of helium nucleus
Least penetrating: stopped by paper
aqueous solution Ans✓✓✓Solid, liquid, or gas dissolved in water
aromatic hydrocarbons Ans✓✓✓Based on benzene structure
Functional benzene group: phenyl
Delocalized electrons
atomic mass unit (u) Ans✓✓✓1/12 of carbon-12 isotope mass
atomic number Ans✓✓✓number of protons
Elements are distinguished by this
# of protons = # of electrons
Atomic weight Ans✓✓✓Atomic mass averaged over isotopes
Beta emission Ans✓✓✓Expulsion of an electron
More penetrating: 1 cm of aluminum
verified answers
"-ide" rule of compounds Ans✓✓✓Compound contains only two dif
elements
3 types of chemical bonds Ans✓✓✓Ionic- electrons transferred
between atoms; electrostatic force=binding force; ex.) NaCl
Covalent- octets achieved through sharing electrons; usually btwn
nonmetallics
Metallic- outer electrons move freely throughout metal; "electron gas"
w/in rigid lattice of metal atoms; conduct heat and electricity well
Alcohols Ans✓✓✓Have one or more hydroxyl functional groups
Alkanes Ans✓✓✓Hydrocarbons w/ all single carbon-carbon bonds
Straight chains
Branches and rings
Alkene Ans✓✓✓Hydrocarbons w/ double carbon-carbon bond
Unsaturated
Simplest = ethylene
Alkynes Ans✓✓✓Hydrocarbons w/ a triple carbon-carbon bond
Simplest = acetylene
, All of the naturally occurring radioactive decay series end when the
radioactive elements have decayed to __________ Ans✓✓✓Lead
Alpha emission Ans✓✓✓Expulsion of helium nucleus
Least penetrating: stopped by paper
aqueous solution Ans✓✓✓Solid, liquid, or gas dissolved in water
aromatic hydrocarbons Ans✓✓✓Based on benzene structure
Functional benzene group: phenyl
Delocalized electrons
atomic mass unit (u) Ans✓✓✓1/12 of carbon-12 isotope mass
atomic number Ans✓✓✓number of protons
Elements are distinguished by this
# of protons = # of electrons
Atomic weight Ans✓✓✓Atomic mass averaged over isotopes
Beta emission Ans✓✓✓Expulsion of an electron
More penetrating: 1 cm of aluminum
