The hot water (which expands, by the way) has no place to go, so either the cap will blow possibly causing steam burns, or it will drain out onto the ground creating a biohazard.
Nothing. It will not hurt anything.
No
Once your vehicle is warmed up, if you have antifreeze coming out of the overflow you have too much in your radiator.
There should be markings on side of the resivoir. or some type of plastic dipstick
A mixture of 1/2 distilled water 1/2 antifreeze to the full line of the radiator overflow container.
If it's a question of too much fluid it can overflow, if it's a question about the fluid being too concentrated - don't worry about it.
ITS 10.5QT...make it a 50/50 mixture. so take half of that amount as your water and the other half your antifreeze and your all set .you can add a little to your overflow also
Not much, the excess coolant would be pushed out the overflow tube.
replace your radiator cap it may be letting hot coolant travel back to the overflow can.
I'm not sure about a Honda Accord, but all cars are pretty much the same. You can remove the radiator cap and add antifreeze, or you can look for the antifreeze "overflow reservoir". A piece of tubing from near the radiator cap should run to a plastic jug about the size of a gallon or two. It usually sits off to one side or the other under the hood. The side of the overflow reservoir may have a fill mark on it. The top should have a lid that is easily removed. That's probably the recommended place to add antifreeze.
buy the 50/50 blend it is already mixed for you it takes 2 gallons dont forget to put some in the overflow bottle
If your use anything more concentrated than about half anitfreeze and half water, the radiator water will freeze at a considerably warmer temperature. There will be less protection. Also, antifreeze actually helps keep your car running cooler in summer. If you use straight antifreeze, the car will "boil over" at a much lower temperature. There will be less protection.