# 1. write a balanced equation for the reaction between iron and oxygen

### Fe+o2+h2o=fe2o3+h2o

Other examples of these special conditions will be encountered in more depth in later chapters. Ionic compounds dissolved in water are, therefore, more realistically represented as dissociated ions, in this case: Unlike these three ionic compounds, AgCl does not dissolve in water to a significant extent, as signified by its physical state notation, s. The solid sodium reacts with liquid water to produce molecular hydrogen gas and the ionic compound sodium hydroxide a solid in pure form, but readily dissolved in water. Although the equation for the reaction between molecular nitrogen and molecular hydrogen to produce ammonia is, indeed, balanced, the coefficients are not the smallest possible integers representing the relative numbers of reactant and product molecules. Additional Information in Chemical Equations The physical states of reactants and products in chemical equations very often are indicated with a parenthetical abbreviation following the formulas. These spectator ions—ions whose presence is required to maintain charge neutrality—are neither chemically nor physically changed by the process, and so they may be eliminated from the equation to yield a more succinct representation called a net ionic equation: Following the convention of using the smallest possible integers as coefficients, this equation is then written: This net ionic equation indicates that solid silver chloride may be produced from dissolved chloride and silver I ions, regardless of the source of these ions. The First Step: Oxidation of Solid Iron It's common knowledge that rust occurs when you leave water on a metal implement or you leave it exposed to moist air. The reddish tinge of that planet is largely due to the presence of iron oxide, or rust, on its surface.

Write balanced molecular, complete ionic, and net ionic equations for this process. Equations for Ionic Reactions Given the abundance of water on earth, it stands to reason that a great many chemical reactions take place in aqueous media. When ionic compounds dissolve in water, they may dissociate into their constituent ions, which are subsequently dispersed homogenously throughout the resulting solution a thorough discussion of this important process is provided in the chapter on solutions.

The numbers of N and O atoms on either side of the equation are now equal, and so the equation is balanced. The reddish tinge of that planet is largely due to the presence of iron oxide, or rust, on its surface. That's because the first step in the rusting process involves the dissolution of solid iron into solution.

When ions are involved in these reactions, the chemical equations may be written with various levels of detail appropriate to their intended use. In a balanced equation, the same number of oxygen, hydrogen and iron atoms must appear on both sides of the equation. Explicitly representing all dissolved ions results in a complete ionic equation.

### Fe o2 fe2o3 balanced equation

Equations for Ionic Reactions Given the abundance of water on earth, it stands to reason that a great many chemical reactions take place in aqueous media. Hint: Balance oxygen last, since it is present in more than one molecule on the right side of the equation. You then have to multiply the number of O2 molecules by 3 and the number of Fe ions by 4. Balance the number of hydrogen atoms by multiplying the number of water molecules by 6 and the number of hydroxide molecules by 4. Besides gaseous oxygen, the formation of rust needs water because it's a two-step process. Ionic compounds dissolved in water are, therefore, more realistically represented as dissociated ions, in this case: Unlike these three ionic compounds, AgCl does not dissolve in water to a significant extent, as signified by its physical state notation, s. Example 2 Molecular and Ionic Equations When carbon dioxide is dissolved in an aqueous solution of sodium hydroxide, the mixture reacts to yield aqueous sodium carbonate and liquid water. Rust is the result of the combination of iron with oxygen in a process called oxidation, and the presence of rust on Mars suggests there may have been more molecular oxygen on the planet in the past, although carbon dioxide, which is the main component of Mars' present atmosphere, can also supply oxygen. Additional Information in Chemical Equations The physical states of reactants and products in chemical equations very often are indicated with a parenthetical abbreviation following the formulas.

Although the equation for the reaction between molecular nitrogen and molecular hydrogen to produce ammonia is, indeed, balanced, the coefficients are not the smallest possible integers representing the relative numbers of reactant and product molecules.

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