why does dry ice form on roads?

Question

i don't get why dry ice forms on roads? sure it is cold but not below 109 farinheit. sure exahust comes out the back tail pipe but isn't that carbon monoaxide not dioxide so why does it form on roads giving us terrible driving conditions?

actually dry ice is solidified carbon dioxide. it subliminates directly into gas. therefore no melted water to freeze so it is an interesting question one that requires some thought or fore knowledge. but thank you for trying.

Answer 1

To clarify, Daniel is wrong. Dry ice is solidified (frozen) carbon dioxide. Carbon dioxide freezes at -109 F, way too cold for normal atmospheric conditions. Carbon monoxide freezes at an even lower temperature.

All ice you see on the road is just frozen water. Normally ice has air bubbles trapped in it, which reflect light giving a white color. Ice without air bubbles is very clear. This is what people call "black ice." It's not black, but since many roads are black, people call it by that name.

As an aside, commercial ice cubes are produced in a way to eliminate air bubbles in water so you get nice clear cubes. If you want to make clear ice cubes at home, first boil the water (sometimes twice), which will expel the air dissolved in the water.

Answer 2

I have never heard of or observed "dry ice" (frozen CO2) forming by natural processes on the earth's surface. It simply isn't cold enough anywhere for this to happen. The ice you refer to is water ice.

To correct something else, carbon dioxide is one of the major components of vehicle exhaust. Carbon monoxide is a minor constituent, resulting from the incomplete combustion of carbon compounds. Water is also a major component of vehicle exhaust. Acid compounds are minor constituents. Depending upon how well maintained the vehicle is, and other factors, various hydrocarbon compounds are also present in vehicle exhausts.

Answer 3

I think you have them transposed Dry ice is solid Co2 Black ice is when the ice is transparent on the road and it appears black leading one to think the road is clear of ice.

Answer 4

Dry ice if solidified Hydrogen. It does not form on roads. When dry ice melts there is no liquid.

Answer 5

Dry ice does NOT form on roads.

Black ice may but that is regular ice, clear in color and very slippery.

Answer 6

the temperature of the cold air reacting with the warmth on the earth's surface.... it is like the frost you see on the grass in the morning, but way more dangerous