5 Five chemical reactions are listed in the table below.
Reaction 1 C.CO, COCO,
Reaction 2 Ca(OH)2 + 2HC- Ch2410
Reaction 3 NHSHA NICI
Reaction 4
PO - P +0,
Reactions 2Mg +0,- 2MgO
Identify any decomposition reaction(s) shown in the table.
A Reaction 1
B Reaction 2
C Reaction 3
D Reaction 4
E Reaction 5

reaction 1 and reaction 4 both are decomposition reactions

while reaction 2 is double displacement reaction and reaction 3 and 5 are combination reactions

—129°C

Explanation:

First, we analyze what was given from the question as follows:

V1 = 2.50L

T1 = 15°C = 15 +273 = 288K

V2 = 1.25L

T2 =?

V1 / T1 = V2 /T2

2.5/288 = 1.25/T2

Cross multiply to express in linear form

2.5 x T2 = 288 x 1.25

Divide both side by the coefficient of T2 i.e 2.5

T2 = (288 x 1.25) / 2.5

T2 = 144K

Converting this temperature(144K) to degree Celsius, we have

T°C = K — 273

T°C = 144 — 273

T°C = —129°C