How does the compound NaOH contain ionic and covalent bonds?

In each hydroxide ion the Oxygen atom and the H atom are bonded via covalent bonds, but the OH- and Na+ are held together in a crystal lattice via ionic bonds, thus making NaOH an ionic compound. Hope this helps!

1.from liquid state to gaseous state is evaporation 3.solid to liquid is melting 5. solid to gaseous state is sublimation 6. gas to solid state is decomposition 7. a change of state is known as the states of matters

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.