Contains iron and carbon together with small amounts of a number of other elements such as magnesium, chromium, nickel, titanium, molybdenum and manganese
Because air is a composition of all kinds of gases and is different everywhere.
There isn't really a difference since a piece of steel can both stainless and air hardened. Stainless steel is a steel alloy with a minimum of 10% chromium content by mass. Metals can be hardened in a variety of ways. They may be work hardened, tempered, air or oil hardened, for example. Tempering, or the systematic heating, cooling and reheating of a material is one technique that might be used to harden steel.
Rusting of steel wool is a chemical change because it involves a reaction between iron in the steel wool and oxygen in the air to form iron oxide (rust). This new substance has different properties than the original steel wool.
No, a tire losing air is a physical phenomenon caused by air molecules escaping through tiny holes or leaks in the tire. This is not a chemical reaction because it does not involve a change in the chemical composition of the tire or the air.
The iron part of steel combines with oxygen in the air, or dissolved in water. This is a chemical reaction, which produces iron oxide- rust.
When a car is turned into a wreck, this involves a physical change because the molecular composition of the car doesn't change. After the crash it will still consist of steel, petrol, etc. However, if one was to set fire to the car, it would undergo a chemical change: its molecular composition would change because the molecules would bind with the oxygen molecules in the air.
This is a chemical property. The reaction of green carbonate with moist air to form a different substance involves a change in the chemical composition of the substance, indicating a chemical reaction.
Blending air into ice cream to give it a lighter texture is a physical process. This is because air being incorporated into the ice cream does not change the chemical composition of the ingredients; it just alters the physical structure by introducing air bubbles to create a lighter texture.
Weathering of rocks can involve both chemical and physical changes. Physical weathering involves the breakdown of rocks without changing their chemical composition, while chemical weathering involves the alteration of a rock's chemical composition through reactions with water, air, or other substances.
High Speed refers to the type of steel alloy used to make the drill bit. This is an air hardening steel (high speed cooling) the hardness should not be affected if the bit is heated (even to redhot ) and allowed to cool in air.
Because rust forms when Iron reacts with Oxygen in the atmosphere to produce Iron oxide. Rust is a different chemical compound, with different chemical properties from either of the two chemical elements which formed it. So, a chemical change has obviously taken place.
A flame is pure energy so it has no real chemical composition except from the chemical compositions of the oxygen and fuel (usually hydrocarbons) needed for it to burn. A flame requires fuel, oxygen and heat energy, although it gives off light and heat energy as well. The act of burning is reacting the fuel with oxygen in the air but the flame itself has no chemical composition.