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Ch.22 - The Main Group Elements
All textbooksMcMurry 8th EditionCh.22 - The Main Group ElementsProblem 22.53b
Chapter 22, Problem 22.53b

Complete and balance the equation for each of the following reactions.
b. Ca(s) + H2O(l) →

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1
Identify the type of reaction: This is a single displacement reaction where calcium (Ca) will react with water (H2O) to form calcium hydroxide and hydrogen gas.
Write the unbalanced equation: Ca(s) + H2O(l) → Ca(OH)2(aq) + H2(g).
Balance the equation by adjusting coefficients to ensure the same number of each type of atom on both sides of the equation.
Start by balancing the calcium atoms: There is 1 Ca atom on both sides, so calcium is balanced.
Balance the hydrogen and oxygen atoms: Adjust the coefficients of H2O and H2 to balance the hydrogen and oxygen atoms.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Balancing Chemical Equations

Balancing chemical equations is essential to ensure that the law of conservation of mass is upheld, meaning the number of atoms of each element must be the same on both sides of the equation. This involves adjusting coefficients in front of compounds rather than changing the subscripts within the chemical formulas.
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Types of Chemical Reactions

Understanding the types of chemical reactions, such as synthesis, decomposition, single replacement, and double replacement, helps in predicting the products of a reaction. In this case, the reaction between calcium and water is a single replacement reaction where calcium displaces hydrogen from water.
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Reactivity of Metals with Water

The reactivity of metals with water varies significantly across the periodic table. Alkali and alkaline earth metals, like calcium, react with water to produce hydroxides and hydrogen gas. Recognizing this reactivity is crucial for predicting the products of the reaction between calcium and water.
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