As far as we know, the mass of the black-hole and it's energy would increase.
well, we simply die.
Then neither of them would win
One of the considerations for the eventual termination of the universe is that all matter will be pulled into black holes, and then these black holes would eventually evaporate.
You cannot see a Blackhole with the naked eye and they're hard to detect anyway. No one would see a Blackhole pull anything into its center.
It sucks all matter within the event horizon. If one was created on Earth, the entire planet would be crushed to a singularity.
The antimatter will annihilate an equal mass of matter in the star and both masses will turn into energy, most likely in the form of gamma rays. Unless you used an enormous amount of antimatter there would be no noticeable change in the star. A large enough amount could blast away the star's outer layers.
An atom of antimatter does not contain any electrons. The equivalent of an electron in antimatter is a positron, which has charge +1.
You would have some explaining to do.
Initially the 9g of remaining matter would survive. Each particle of antimatter can only annihilate with one other particle of antimatter. At this point the 1g of antimatter would cause an explosion equivalent to that of 200000 pounds of TNT. Causing both groups of matter and antimatter to be obliterated.
That is not currently known. There is a slight assymetry between matter and antimatter, but so far, it seems that this assymetry is not enough to explain why there is only matter, and hardly any antimatter, in the Universe. Without such an assymetry, there wouldn't be either matter or antimatter in the Universe - just radiation. For more information about what is known, and what isn't, check the Wikipedia article on "Baryon asymmetry".
If antimatter were visible to the human eye, it would likely appear similar to regular matter, but with opposite charge. This means that antimatter would have colors and properties that are the opposite of what we see in our everyday world.
You would likely be arrested.