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CHM 2025 FINAL EXAM QUESTIONS AND CORRECT ANSWERS

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CHM 2025 FINAL EXAM QUESTIONS AND CORRECT ANSWERS

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CHM 2025 FINAL EXAM QUESTIONS AND
CORRECT ANSWERS
DefineA2matterA2-A2Ans--MatterA2isA2anythingA2thatA2occupiesA2spaceA2andA2hasA2mass.

StatesA2ofA2matterA2-A2Ans--
MatterA2canA2existA2asA2aA2solid,liquid,A2orA2gas.A2SolidA2matterA2canA2beA2eitherA2amorph
ousA2orA2crystalline.

ClassificationA2ofA2matter:A2-A2Ans--pureA2substancesA2andA2mixtures

PureA2matterA2isA2eitherA2anA2element(aA2substanceA2thatA2cannotA2beA2decomposedA2int
oA2simplerA2substances)A2orA2aA2compoundA2(aA2substanceA2composedA2ofA2twoA2orA2mor
eA2elementsA2inA2fixedA2definiteA2proportions).

MixturesA2-A2Ans--
TwoA2orA2moreA2differentA2substances,A2theA2proportionsA2ofA2whichA2mayA2varyA2fromA2o
neA2sampleA2toA2theA2next

PhysicalA2changeA2-A2Ans--
heA2appearanceA2ofA2matterA2mayA2change,A2butA2itsA2compositionA2doesA2not.

ChemicalA2changeA2-A2Ans--heA2compositionA2ofA2matterA2changes.

HeterogeneousA2-A2Ans--HavingA2aA2compositionA2thatA2variesA2fromA2regionA2toA2region

homogeneousA2-A2Ans--HavingA2theA2sameA2compositionA2throughout

physicalA2propertiesA2-A2Ans--doA2notA2involveA2aA2changeA2inA2composition

chemicalA2propertiesA2-A2Ans--involveA2aA2changeA2inA2composition

solutionA2-A2Ans--AA2homogeneousA2mixtureA2ofA2twoA2orA2moreA2substances

pureA2substanceA2-A2Ans--
PureA2matterA2isA2eitherA2anA2element(aA2substanceA2thatA2cannotA2beA2decomposedA2int
oA2simplerA2substances)A2orA2aA2compoundA2(aA2substanceA2composedA2ofA2twoA2orA2mor
eA2elementsA2inA2fixedA2definiteA2proportions).

compoundA2-A2Ans--
(aA2substanceA2composedA2ofA2twoA2orA2moreA2elementsA2inA2fixedA2definiteA2proportions)
.

, elementA2-A2Ans--
(aA2substanceA2thatA2cannotA2beA2decomposedA2intoA2simplerA2substances)

EnergyA2-A2Ans--EnergyA2isA2conserved—
itA2canA2beA2neitherA2createdA2norA2destroyed.A2UnitsA2ofA2energyA2areA2theA2jouleA2(J),A2t
heA2calorieA2(cal),A2theA2nutritionalA2CalorieA2(Cal),A2andA2theA2kilowatt-hourA2(kWh).

EndothermicA2energyA2-A2Ans--chemicalA2reactionsA2thatA2absorbA2energy

ExothermicA2energyA2-A2Ans--ChemicalA2reactionsA2thatA2emitA2energy

potentialA2energyA2-A2Ans--heA2energyA2associatedA2withA2itsA2positionA2orA2composition

kineticA2energyA2-A2Ans--theA2energyA2associatedA2withA2itsA2motion

theA2totalA2energyA2ofA2aA2sampleA2ofA2matterA2isA2theA2sumA2ofA2...A2-A2Ans--
itsA2kineticA2andA2potentialA2energy

ConservationA2ofA2massA2-A2Ans--
MatterA2isA2alwaysA2conserved.A2InA2aA2chemicalA2change,A2theA2sumA2ofA2theA2massesA2
ofA2theA2reactantsA2mustA2equalA2theA2sumA2ofA2theA2massesA2ofA2theA2products.

chemistryA2-A2Ans--
ChemistryA2isA2theA2scienceA2thatA2triesA2toA2understandA2whatA2matterA2doesA2byA2under
standingA2whatA2moleculesA2do.

TheA2ScientificA2MethodA2-A2Ans--
TheA2ScientificA2Method:A2ChemistsA2employA2theA2scientificA2method,A2whichA2makesA2u
seA2ofA2observations,A2hypotheses,A2laws,A2theories,A2andA2experiments.

AnalyzingA2andA2InterpretingA2Data:A2-A2Ans--
AA2seriesA2ofA2measurementsA2areA2referredA2toA2asA2data.A2ScientificA2dataA2canA2beA2gr
aphedA2toA2seeA2relationships.

temperatureA2-A2Ans--
TheA2temperatureA2ofA2matterA2isA2relatedA2toA2theA2randomA2motionsA2ofA2theA2molecules
A2andA2atoms.A2TemperatureA2isA2measuredA2inA2threeA2scales:A2FahrenheitA2(°F),A2Celsi
usA2(°C),andA2KelvinA2(K).A2

KA2=A2275A2+A2CA2degress

HeatA2CapacityA2-A2Ans--
TheA2temperatureA2changeA2thatA2matterA2undergoesA2uponA2absorptionA2ofA2heatA2isA2rel
atedA2toA2theA2heatA2capacityA2ofA2theA2substanceA2composingA2theA2matter.

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