ACS GEN CHEM 2 EXAM REVIEW
2024/2025 Exam Questions and
Corresponding Answers with Surety of
100% Pass Mark
which particle, if lost from the nucleus will not result in a change in the atomic
number? - 🧠ANSWER ✔✔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 _______. - 🧠ANSWER ✔✔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
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,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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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: - 🧠ANSWER ✔✔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
Page 2 of 21
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619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
, 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 - 🧠ANSWER ✔✔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) - 🧠ANSWER ✔✔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? - 🧠ANSWER ✔✔4
degrees celsius
Page 3 of 21
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
2024/2025 Exam Questions and
Corresponding Answers with Surety of
100% Pass Mark
which particle, if lost from the nucleus will not result in a change in the atomic
number? - 🧠ANSWER ✔✔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 _______. - 🧠ANSWER ✔✔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
Page 1 of 21
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
,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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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: - 🧠ANSWER ✔✔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
Page 2 of 21
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
, 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 - 🧠ANSWER ✔✔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) - 🧠ANSWER ✔✔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? - 🧠ANSWER ✔✔4
degrees celsius
Page 3 of 21
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
