Question

Which equation represents a physical change?

(1) H2O(s) + 6.01 kJ ==>H2O(l)
(2) 2H2(g) + O2(g) ==>2H2O(g) + 483.6 kJ
(3) H2(g) + I2(g) + 53.0 kJ ==>2HI(g)
(4) N2(g) + 2O2(g) + 66.4 kJ ==> 2NO2(g)

Answer 1

1

Step-by-step explanation:

1

Answer 2

The answer is (1). The physical change means the compound is not changed only the status change. Like the first one, the process is from solid H2O to liquid H2O.