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

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.

Answer 2

Answer:

1

Explanation:

1