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Cobalt and Thorium
Boiling water does not change the chemical make up of water, it just changes the state of the matter from liquid to gas. Rust is caused by a chemical reaction to the metal making an oxide which is a different compound.
Strangely worded question. I assume you mean how fast a bike can go. Usually it's more about the rider than the bike, which makes the answer even more muddy. Secondly it's very dependent on what kind of bike and what kind of riding you're talking about, is it on the flat on a fairly normal bike? downhill? alone or in group? for what distance?
The best kind of water resistant picnic tables are reinforced steel or iron. These will last a long time and if treated properly will avoid rusting.
physical change
Iron rusting is a chemical change in which iron reacts with moist air to form fe2o3 commonly known as rust, a brown coloured coating.
A chemical change, redox reaction: 2Fe(s) + O2(g) --> 2FeO(s)
Not worth it. Sell the bike as it is and buy the kind of bike you want instead.
Oxygen.
Rusting is a reaction which combines molecules to form other molecules: metal + oxygen -> rust. The definition of a chemical reaction is molecules turning into other molecules, so rusting is a chemical reaction.
Iron rusting is a chemical change in which iron reacts with moist air to form fe2o3 commonly known as rust, a brown coloured coating.
as it takes a lot of time
Steel castings can prevent rusting depending on what the kind of steel. Carbon steel may cause rusting at a higher rate than stainless steel.
a bike that is small
What kind of an idiot are you? That seriously depends on what kind of freaking bike you have, STUPID!
a bmx bike
Cobalt and Thorium