BY KWASI SMITH

Making Iron Oxide

(Rust)

Rust

Rust is scientifically called oxidation, which occurs when oxygen comes in long-term contact with certain metals. Over time, the oxygen combines with the metal at an atomic level, forming a new compound called an oxide and weakening the bonds of the metal itself. If the base metal is iron or steel, the resulting rust is properly called iron oxide. http://www.wisegeek.com/what-is-rust.htm

The goal + Stoichiometry

My goal in this reaction is to create Iron Oxide (Rust) by means of exposing Iron to Oxygen under prime conditions. This is an exothermic reaction, which means that it gives off heat.

Fe + O2 = Fe2O3

55.84g/mol 32g/mol 159.67g/mol5g 2.84g 14.21g

0.089/mol 0.067/mol 0.445/mol

1st Reaction

For my first reaction, I filled two 1liter sandwich bags with 5 grams of Iron Powder, 1 gram of Vermiculite, 1ml water, and 2 grams of NaCl (table salt). During the reaction, one of the bags were open as to have an unlimited amount of oxygen, and the other bag was closed with approximately 1 liter of air.

Over time, the bags began to get warmer as the Iron in the bags reacted with the surrounding oxygen. The bag granted unlimited oxygen had a higher overall temperature than the closed bag.

1 2 3 4 5 605

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1st Reaction

Closed BagOpen Bag

Time (10 min)

Tem

p (°

C)

2nd Reaction

What I have changed in the second reaction is the amount of water being used in one of the bags in reaction from only 1 milliliter to 2 milliliters. Both bags will be open to see how much the extra water will influence the reaction and the data taken.

0 10 20 30 40 50 600

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2nd Reaction

1ml Bag 2ml Bag

Time (min)

Tem

p (°

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Ideal Gas Law

The ideal gas law can be viewed as arising from the kinetic pressure of gas molecules colliding with the walls of a container in accordance with Newton's laws. But there is also a statistical element in the determination of the average kinetic energy of those molecules. The temperature is taken to be proportional to this average kinetic energy; this invokes the idea of kinetic temperature. One mole of an ideal gas at STP occupies 22.4 liters.

http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/idegas.html

Ideal Gas Law continued

Pressure x Volume = Moles x Ideal Gas Constant x TemperatureWith the appropriate variables, the formula looks like this…

PV=nRTI can use this formula to calculate the amount of oxygen I will

need to completely react the iron.

This formula tells me how much air I would need to affect the Iron, but air consists of only 20% oxygen. So five times the given amount of air will be needed to completely affect the Iron.

The Catalyst

Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. A catalyst may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts. Substances that interact with catalysts to slow the reaction are called inhibitors (or negative catalysts). http://en.wikipedia.org/wiki/Catalysis

The Catalyst in this reaction is the NaCl, or the salt. When added to the water, it can react with the Iron more quickly and effectively. The salt causes the iron to react with the Oxygen in the atmosphere quicker than it would without it.

Bonding

When an element steals electrons from another element, it is called an Ionic Bond. When electrons are shared between elements it is called a Covalent bond. This particular reaction is an ionic bond.

Oxygen is a very electron rich element that can hold onto its electrons well, as opposed to Iron which is a metal it has no charge, making it easy for Oxygen to steal its electrons. Oxygen steals 3 electrons from Iron and Oxygen becomes O3 while Iron becomes +Fe3.

Bonding Continued

Essentially, this is what it would look like…

Activation Energy

In chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport is called activation energy. http://www.britannica.com/EBchecked/topic/4535/activation-energy

DasEnde