Soft - Sponge
Metal - Iron
Transparent - Glass
Soluble - Salt
Opaque - Cardboard
The atomic number of oxygen is 8, because oxygen has eight protons in the nucleus.
Answer:
B. hot to cold
Explanation:
Energy wants to reach thermal equilibrium (which is basically just balanced temperature) so it will move from hot to cold to make the cold object warmer and the hot object cooler.