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BIOLl 1107l Examl 1l –l Principlesl ofl Biologyl Il ( l 2026/l 2027l Update)l Guide l l l Questionsl &l Answersl l Gradel A
Q:l pHl expresses
Answer:
protonl concentrationl inl al solution.
Q:l Acidsl havel al pHl of
Answer:
lessl thanl 7
Q:l Basesl havel al pHl of
Answer:
greaterl thanl 7
Q:l Inl acid-basel reactions
Answer:
al protonl donorl (acid)l transfersl al protonl tol al protonl acceptorl (base)
Q:l Greaterl H+l concentration
Answer: 1 / 3
lowerl pHl -l morel acidic
Q:l Lowerl H+l concentration
Answer:
higherl pHl -l morel basic/alkaline
Q:l Buffers
Answer:
compoundsl thatl minimizel changesl inl pH
Q:l pHl Scale
Answer:
Q:l Chemicall equilibrium
Answer:
occursl whenl thel forwardl andl reversel reactionsl proceedl atl thel samel ratel andl thel quantitiesl ofl reactantsl andl productsl remainl constant. 2 / 3
Q:l Endothermicl reactions
Answer:
mustl absorbl heat
Q:l exothermicl reactions
Answer:
mustl releasel heat
Q:l Energy
Answer:
thel capacityl tol dol workl orl supplyl heat.l
(Thisl capacityl existsl inl onel ofl twol ways—asl al storedl potentiall orl asl anl activel motion)
Q:l Storedl energyl is
Answer:
potentiall energy
Q:l Thel energyl ofl movementl isl called
Answer:
kineticl energyl orl thermall energy
Q:l Electronsl inl anl outerl shelll (fartherl froml thel positivelyl chargedl nucleus)l havel ______l potentiall energyl thanl dol electronsl inl anl innerl shell.
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