# Writing and balancing chemical equations quiz

## 20 balanced chemical equations

Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products. 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 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. 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. Hint: Balance oxygen last, since it is present in more than one molecule on the right side of the equation. Formulas for the substances undergoing the change reactants and substances generated by the change products are separated by an arrow and preceded by integer coefficients indicating their relative numbers. For example, consider the reaction of ethane C2H6 with oxygen to yield H2O and CO2, represented by the unbalanced equation: Following the usual inspection approach, one might first balance C and H atoms by changing the coefficients for the two product species, as shown: This results in seven O atoms on the product side of the equation, an odd number—no integer coefficient can be used with the O2 reactant to yield an odd number, so a fractional coefficient, , is used instead to yield a provisional balanced equation: A conventional balanced equation with integer-only coefficients is derived by multiplying each coefficient by 2: Finally with regard to balanced equations, recall that convention dictates use of the smallest whole-number coefficients.

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.

Feedback Have feedback to give about this text?

The physical states of reactants and products in chemical equations very often are indicated with a parenthetical abbreviation following the formulas. 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.

Click here. Dividing each coefficient by the greatest common factor, 3, gives the preferred equation: Use this interactive tutorial for additional practice balancing equations.

## Balancing chemical equations practice worksheet

Chemical equations are symbolic representations of chemical and physical changes. The physical states of reactants and products in chemical equations very often are indicated with a parenthetical abbreviation following the formulas. Common abbreviations include s for solids, l for liquids, g for gases, and aq for substances dissolved in water aqueous solutions, as introduced in the preceding chapter. 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. Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products. Dividing each coefficient by the greatest common factor, 3, gives the preferred equation: Use this interactive tutorial for additional practice balancing equations. 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. Chemical reactions in aqueous solution that involve ionic reactants or products may be represented more realistically by complete ionic equations and, more succinctly, by net ionic equations. Feedback Have feedback to give about this text?

Write balanced molecular, complete ionic, and net ionic equations for this process. Hint: Balance oxygen last, since it is present in more than one molecule on the right side of the equation.

Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products. 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.

Chemical reactions in aqueous solution that involve ionic reactants or products may be represented more realistically by complete ionic equations and, more succinctly, by net ionic equations.

Common abbreviations include s for solids, l for liquids, g for gases, and aq for substances dissolved in water aqueous solutions, as introduced in the preceding chapter.

Rated 10/10
based on 92 review

Download