Question

PLEASE HELP THIS IS TIMED

Which of the following is a physical change?
CsF(s) + XeFo(s) → CsXeF;(s)
CO2 (s) + CO2(g)
O N2 (g) + 3H2 (g) → 2NH3 (g)
2H2 (g) + O2 (g) → 2H20 (1)
Zn(s) + 2 MnO2(s) + H20(1) → Zn(OH)2(s) + Mn2O3(s)

Answer 1

CO2 (s) + CO2 (g)
This is a physical change because only the state of matter changes, not the chemical makeup.