*Identify if the following are physical (P) or chemical (C) characteristics:

1) __ Sodium (Na) is a very reactive alkali metal.
2) __ Oxygen (O) is a gas.
3) __ Wood is flammable.
4) __ A ruby is red.
5) __ Copper (Cu) conducts electricity.
6) __ Water (H2O) freezes at 0 degrees Celsius.
7) __ Iron (Fe) reacts with water to form rust.
8) __ Silver (Ag) reacts with moisture in the air to form tarnish.
9) __ The chalkboard is magnetic.
10) __ Sand and dirt are mixed in a flower pot.