Yes you can compost grass that has been teated with a weed killer. Wether weed kill or some other product keep the product in mind when you use the compost. depending on the product you may not want to use it in your vegtable garden. In your case this would be great to use weed killer compost on the lawn. As time goes by most of any added product will leach out of the compost but I would still use care were the compost gets used. I use weed kill and ferterlizer on my lawn and compost the clippings. I use most of the compost on the lawn and in the flower garder with no know problems.
A product called Gallant NF herbicide. You can spray a grassy shrubbery and it only kills grasses
one type of grass that kills plants can be Johnson farm grass. they have poisonous roots to plants but not humans.
You can not really put anything in your flower beds to prevent grass, but if you happen to get grass in your flower beds, there is a product called Ortho Grass B Gon Garden Grass Killer. It kills grasses without causing any harm to flowers or groundcover.
They eat grass
too many big words!
it kills the parts it touches
Because poison kills plants
Yes, salt kills the grass in most yards. There are some salt-tolerant grasses but they are not common.
Chlorine gas
Because the acidity from the dog's urine kills the patch of grass they urinated in.
Only aerasol bug spray kills grass, the same goes for aerasol sunscreen
Salt is bad for grass in large doses. Although salt typically kills grass, it can be used to get rid of an unwanted patch.