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SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) ANSWERS
+

B
42 12 Redox

The metal which is more electropositive will
displace the less electropositive metal from its
solution.
Logam yang lebih elektropositif menyesarkan logam
yang kurang reaktif daripada larutan garamnya.
Q= mcꝊ
= (50)(4.2)(56-29)
= 5670 J

n = MV/1000
A = (0.5)(50) / 1000
43 13 Thermochemistry
=0.025 mol

ΔH = Q/n
= 5670 J / 0.025 mol
-1
= 226800 Jmol
-1
= - 226.8 KJmol
Cold pack.
Adding ammonium nitrate to water turns the mixture
cold. It is endothermic reaction.
A
44 13 Thermochemistry
Pek sejuk
Ammonium nitrat dicampurkan dengan air akan
menghasilkan campuran yang sejuk. Ini ialah tindak
balas endotermik.
Q= mcꝊ
= (100)(4.2)(1.0)
= 420 J
45 13 Thermochemistry C
n = m/JAR
= 2.4/24
=0.1 mol

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