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Rust is such a problem because its attacking iron, steel due to airborne pollutants.The annoying thing is rust just keeps growing and its especially bad near coastal areas due to the salt levels.

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Over time oxygen, water and any iron mass will form rust. Rust consists of hydrated iron(III) oxides Fe2O3. nH2O, iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3. Rusting is the common term for corrosion of iron

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Rust is an iron oxide and is usually the particular form of red oxide which is created by redox which is the reaction of iron  and oxygen

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Rotting of food is a non-reversible reaction. Tiny living things called micro-organisms feed on the food and turn it into other substances, including nitrogen compounds and carbon dioxide.

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Food rotting is bad because if you eat the rotted food i will smell bad, taste horrible and look unappetizing to eat. Food rotting can cause to having a sore stomach because it has rot and it could be over-date.

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-Drying: Removing water prevents the microorganisms from growing, or digesting the food.
-Adding salt or sugar:Removes water by osmosis
-Adding vinegar: Reduces the pH to prevent the enzymes in the microorganisms from working

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-Canning:The sealed can is heated to kill bacteria. When it cools, no more bacteria can enter.
-Cooling: The food is kept at a low temperature (4°C) so bacteria cannot reproduce (they are not killed).
-Freezing: Bacteria cannot reproduce at low temperatures and the water in the food is frozen.

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Foods can rot if you leave bags open for too long, lids off, over-date, or not kept in the right temperature.

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Microbial Growth. Microorganisms, specifically bacteria, molds, and yeasts, can cause food to rot. Eg. Microorganisms that break down fats in unsalted butter can cause it to become rancid. Bacteria that breaks down protein in meat (proteolytic bacteria) and results in foul odors

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Acid rain is rainfall made so acidic by atmospheric pollution that it causes environmental harm, mostly to forests and lakes. Acid rain is caused by nitrogen oxides and sulfur dioxide, eventually, these oxides react with oxygen and water to give nitric acid and sulfuric acid. It is a problem because air pollution like sulfur dioxide and nitrogen oxides can cause respiratory diseases, or can make these diseases worse.

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Ocean acidification refers to a decrease in the pH of the ocean over an extended period of time, caused mostly by approval of carbon dioxide from the atmosphere. These chemical reactions are termed "ocean acidification" or "OA" for short. When carbon dioxide dissolves in this ocean, carbonic acid is formed and is assumed as a cause of reproductive disorders in some fish.

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A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually.

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An acid is a substance that donates hydrogen ions. Because of this, when an acid is dissolved in water, the balance between hydrogen ions and hydroxide ions is removed.

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Acids are a substance with specific chemical properties including turning litmus red, defusing alkalis, and dissolving some metals. Some examples for acids are Hydrochloric acid (HCl), Nitric acid (HNO3) and Acetic acid in vinegar. Bases turn red litmus paper blue and have a pH greater than 7 and their aqueous solutions have a bitter taste. Some examples for bases at home are soaps and lye.

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Rust has knocked down bridges, killing dozens, it's killed at least a handful of people at nuclear power plants, nearly cause reactor meltdowns, and challenged those storing nuclear waste. It has shut down the largest oil pipelines, rendered military jets and ships unfit for service, and torn apart the fuselage of a commercial plane mid flight

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Rust is such a problem because its attacking iron, steel due to airborne pollutants.The annoying thing is rust just keeps growing and its especially bad near coastal areas due to the salt levels.

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Rust is an iron oxide and is usually the particular form of red oxide which is created by redox which is the reaction of iron  and oxygen. Over time oxygen, water and any iron mass will form rust

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1. https://en.wikipedia.org/wiki/Rust

2. http://www.liquideng.com.au/rustprob.html

3. http://www.ncheurope.com/en/resources/rust-problems