Practice Balancing Chemical Equations Quiz

The balanced equation shows that two hydrogen molecules react with one oxygen molecule to form two water molecules. Coefficients ensure conservation of atoms on both sides of the equation.

Placing a coefficient of 2 before Mg and MgO balances the magnesium atoms while the oxygen molecule remains unchanged. This ensures that both sides of the equation have an equal number of atoms.

The chlorine molecule comprises two atoms, requiring two sodium atoms to form sodium chloride. Using the correct coefficients balances both sodium and chlorine atoms in the reaction.

Methane combustion requires two oxygen molecules to yield one carbon dioxide and two water molecules. The coefficients ensure that carbon, hydrogen, and oxygen atoms are balanced on both sides.

Two molecules of hydrochloric acid provide the required chlorine atoms for zinc chloride while also forming hydrogen gas. The coefficients are chosen to balance the number of atoms on both sides of the equation.

Ethanol combustion requires three oxygen molecules to produce carbon dioxide and water, while maintaining the conservation of atoms. The coefficients ensure that carbon, hydrogen, and oxygen are balanced throughout the reaction.

In the combustion of propane, one mole of propane reacts with five moles of oxygen to yield three moles of carbon dioxide and four moles of water. The balanced equation conserves carbon, hydrogen, and oxygen atoms on both sides.

Balancing the reaction requires three iron atoms to form Fe3O4 while four water molecules supply sufficient oxygen and hydrogen atoms. This arrangement conserves the number of iron, oxygen, and hydrogen atoms.

Decomposition of potassium chlorate releases oxygen gas while forming potassium chloride. The coefficients ensure that potassium, chlorine, and oxygen atoms are balanced on both sides of the equation.

Aluminum reacts with hydrochloric acid to yield aluminum chloride and hydrogen gas. The balanced equation with coefficients 2, 6, 2, and 3 conserves all atoms involved.

Balancing this reaction involves using two molecules of hydrochloric acid to react with sodium carbonate, yielding sodium chloride, carbon dioxide, and water. The final coefficients ensure all elements are balanced.

Phosphorus reacts with oxygen to form diphosphorus pentoxide. The balanced equation requires five molecules of oxygen to perfectly combine with one molecule of P4 to yield two molecules of P2O5, conserving the atoms.

Combustion of butane involves multiplying the entire equation to avoid fractional coefficients. The correct coefficients ensure that carbon, hydrogen, and oxygen atoms are conserved, leading to 13 molecules of oxygen reacting with 2 molecules of butane.

Decomposition of hydrogen peroxide produces water and oxygen. Doubling the hydrogen peroxide helps avoid fractional coefficients, resulting in a balanced equation with two water molecules and one oxygen molecule produced.

The reaction of copper with nitric acid is a redox process that requires careful balancing of atoms and charge. The coefficients in the correct equation ensure that copper, nitrogen, hydrogen, and oxygen are all balanced.

The redox reaction in acidic solution is balanced by ensuring both mass and charge conservation. The half-reaction method yields the correct coefficients, balancing manganese, iron, and hydrogen alongside oxygen in water.

Balancing redox reactions in basic solution involves initially balancing in acidic conditions and then adding OH- to neutralize the H+ ions. The correct equation ensures that both the atoms and the charge are balanced in the basic medium.

In fermentation, one molecule of glucose produces two molecules of ethanol and two molecules of carbon dioxide. This stoichiometry conserves the number of carbon, hydrogen, and oxygen atoms on both sides of the reaction.

This dramatic decomposition reaction produces a characteristic 'volcano' effect, and the balanced equation must conserve all atoms. The coefficients ensure that nitrogen, hydrogen, chromium, and oxygen are correctly balanced.

Neutralization requires the acid and base to react in proportions that yield a salt and water. The balanced equation shows that two molecules of phosphoric acid react with three molecules of calcium hydroxide to form calcium phosphate and water.