ACS GEN CHEM 2 EXAM REVIEW STUDY
GUIDE QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS | NEW UPDATE 2026
which particle, if lost from the nucleus will not result in a change in the atomic number? -
PROTON - one unit of positive charge
ALPHA PARTICLE - has two units of positive charge
BETA PARTICLE - one unit of negative charge
NEUTRON - has no charge, and will not change the atomic number
an atom of the element of atomic number 84 and mass number 199 emits an alpha particle. the
residual atom after this change has an atomic number of _______ and a mass number of
_______. - when an atom emits an alpha it looses 2 protons and 2 neutrons
So atomic number Z which represents the number of protons is decreased by 2 : here 84-2 =82
and The mass number A which represents number of protons + neutrons is dereassed by 4: here
199-4= 195
side note: beta particles result in gain of one proton and loss of one neutron, so mass stays the
same and atomic number increases by one
in effecting nuclear changes by bombarding target nuclei with positively charged alpha particles
it is necessary to accelerate these particles to high speed because it is necessary to -
overcome the force of repulsion of the nucleus
, a simple method of showing experimentally that a solid substance may be ionic is to show that
it - conducts electricity in when dissolved in water
-unique to ionic compounds
the boiling point of water compared with other members of the series can be explained by: -
hydrogen bonding
-has the highest IMF than the other compounds listed due to h bond. h bonds only happen
when H is bonded to N, O, or F
sodium chloride NaCl crystallizes in a face centered cubic lattice of chloride ions, with smaller
sodium ions occupying holes between Cl ions. how many cl- ions are in contact with and single
Na+ ion - 6
-is a octahedral hole - so coordination number of 6; tetrahedral have coordination number of 4
and simple cubic hole has coordination number of 8
according to the phase diagram showing the gas, liquid and solid phases of a pure substance
what phase or phases can be present at point x (phase diagram where x lies on boiling point
curve) - liquid and gas
-know where each state lies on diagram
three phases are always in same relative positions with varying slopes. if point lies on the phase
boundary line both phases can occur together
what is the normal melting point of the pure substance Z? - 4 degrees celsius
GUIDE QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS | NEW UPDATE 2026
which particle, if lost from the nucleus will not result in a change in the atomic number? -
PROTON - one unit of positive charge
ALPHA PARTICLE - has two units of positive charge
BETA PARTICLE - one unit of negative charge
NEUTRON - has no charge, and will not change the atomic number
an atom of the element of atomic number 84 and mass number 199 emits an alpha particle. the
residual atom after this change has an atomic number of _______ and a mass number of
_______. - when an atom emits an alpha it looses 2 protons and 2 neutrons
So atomic number Z which represents the number of protons is decreased by 2 : here 84-2 =82
and The mass number A which represents number of protons + neutrons is dereassed by 4: here
199-4= 195
side note: beta particles result in gain of one proton and loss of one neutron, so mass stays the
same and atomic number increases by one
in effecting nuclear changes by bombarding target nuclei with positively charged alpha particles
it is necessary to accelerate these particles to high speed because it is necessary to -
overcome the force of repulsion of the nucleus
, a simple method of showing experimentally that a solid substance may be ionic is to show that
it - conducts electricity in when dissolved in water
-unique to ionic compounds
the boiling point of water compared with other members of the series can be explained by: -
hydrogen bonding
-has the highest IMF than the other compounds listed due to h bond. h bonds only happen
when H is bonded to N, O, or F
sodium chloride NaCl crystallizes in a face centered cubic lattice of chloride ions, with smaller
sodium ions occupying holes between Cl ions. how many cl- ions are in contact with and single
Na+ ion - 6
-is a octahedral hole - so coordination number of 6; tetrahedral have coordination number of 4
and simple cubic hole has coordination number of 8
according to the phase diagram showing the gas, liquid and solid phases of a pure substance
what phase or phases can be present at point x (phase diagram where x lies on boiling point
curve) - liquid and gas
-know where each state lies on diagram
three phases are always in same relative positions with varying slopes. if point lies on the phase
boundary line both phases can occur together
what is the normal melting point of the pure substance Z? - 4 degrees celsius
