Paz,+K.

__ Questions: __ In a Paragraph or more tell the class your Interests, favorite subjects, favorite topics in science, least favorite topics in science, and what you Would Like to Learn This Year.

My name is kevin I like to draw monsters.My favorite subject is science.My favorite topic in science is space.my least favorite topic is the rock cycle.I would like to learn about stars this year.

My hypothesis is that, if metals are exposed to contaminants with high amounts of acid or oxygen metal will rast faster

My problem statement is.... How do different contaminants affect how metal rusts.

The independent variable is the type of contaminant used on the metal The dependant variable is how much time(hours) it takes for the metal to rust The control is the type of metal, the amount of acid, and how its put into the metal

Oxidation is a reaction in which the atoms in a substance lose electrons.

Rust is an example of oxidation formed when steel oxidises, water can help oxidise metals.

Copper however, does not get brown rust, instead copper oxidises into a greenish substance known as copper oxide.

When metal oxidises the metal is not weakened but forms a patina.

A patina is a film that forms on objects over a large period of time of being exposed to wind and water.

Oxidation not only forms rust, oxidation is also the cause for fruits rotting and turning brown.

The amount of oxygen and where it combines to the substance affects the process of oxidation.

For example a sliced apple rots faster because its easier for the oxygen to combine with the substance.

The skin of the apple acts as a barrier against the oxygen, preventing oxidation.

Cars can rust, but these days you dont see them rust,a coat of paint on a car can prevent oxidation.

The paint is like an apple skin protecting the car from oxidation thus, no rust appears.

Stainless steel does not rust because it is surrounded by another layer of metal that does not contain free radicals but

oxidation can occurr even if there is a small gap between rust protection.

Burning is also an example of oxidation.

There is also reduction which is the gain of electrons.

Redox is a chemical reaction in which atoms have their oxidation state changed

An elements oxidation state is always zero, even as a molocule.

An example of a redox reaction is between hydrogen and flourine.

The hydrogen ionizes and the flourine is being reduced.

Redox reactions are similar to most chemical reactions.

Redox can also be involved in geology.

Uranium deposits are an example of redox's part in geology.

Contaminints can affect how fast metal oxidizes or rusts.

Water can increase the speed of oxidation.

Since H2O contains oxygen, oxidation in metal will happen faster.

Some other contaminants could also decrease the time it takes for metal to rust.

Acid could also affect how metal oxidizes.

Learn more about [|rust removal]