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Chapter 7: Problem 27

What one thing do all chemical reactions have in common?

Short Answer

Expert verified
All chemical reactions involve the breaking and forming of chemical bonds, and they follow the law of conservation of mass.

Step by step solution

01

Understand the Concept of a Chemical Reaction

A chemical reaction involves a process where one or more substances, known as reactants, are converted into different substances called products. During this process, the arrangement of atoms is rearranged to form new compounds.
02

Identify Common Aspects

Regardless of the type of chemical reaction, there's always an involvement of breaking old chemical bonds and forming new ones. This bond transformation is a hallmark of all chemical reactions.
03

Conservation of Mass

One fundamental aspect of all chemical reactions is the conservation of mass. This means that the total mass of reactants equals the total mass of the products, as atoms are rearranged but not destroyed or created in any chemical reaction.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Reactants and Products
In a chemical reaction, interactants are called reactants. They start the process. During the reaction, these reactants transform into new substances known as products. Imagine reactants as the ingredients in a recipe, like flour and sugar in a cake. They undergo changes to become the final product鈥攖he cake itself in our analogy.

In this transformation, no atom is lost; they simply rearrange to form new substances. This is a critical aspect, as it helps us understand the reaction pathway and predict the products that will form. To write chemical reactions, we show reactants on the left and products on the right, separated by an arrow indicating the direction of the reaction.
  • Reactants transform into products.
  • No atoms are lost in this process.
  • Formula: Reactants 鈫� Products.
Bond Transformation
Chemical reactions are all about changes in bonds between atoms. Bonds are the forces holding atoms together. During a reaction, these bonds are broken and new ones form. This is bond transformation.

Think of molecules as building blocks held together by these bonds. In a reaction, we rearrange these blocks, breaking old connections and forming new ones. This is similar to remodeling a house; you keep most of the materials but rearrange them to form a different structure.
  • Bonds are broken in the reactants.
  • New bonds form in the products.
  • Energy is often required to break bonds and released when new bonds form.
Understanding bond transformation helps us to predict the energy changes and the stability of the products formed.
Conservation of Mass
An essential principle of chemical reactions is the conservation of mass. This means the total mass of reactants equals the total mass of the products. No mass is lost or gained during a chemical reaction. This principle holds true because atoms cannot be created or destroyed in a chemical reaction.

Imagine you're reshuffling a deck of cards. The total number remains the same even when the order changes. Similarly, during a reaction, atoms just rearrange, keeping the total mass constant.
  • Mass of reactants = Mass of products.
  • No atoms are lost or gained.
  • This principle aids in balancing chemical equations to reflect equal mass.
Knowing this helps us verify our chemical reactions, ensuring they align with this fundamental scientific principle.

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Most popular questions from this chapter

It is often believed that things that are hot contain a lot of heat. Use the thermodynamic concepts of system, surroundings, and boundaries to explain why this notion is incorrect.

Predict without using tables which of the following reactions would be endothermic. (a) \(\mathrm{H}_{2}(g) \longrightarrow 2 \mathrm{H}(g)\) (b) \(\mathrm{H}_{2} \mathrm{O}(g) \longrightarrow \mathrm{H}_{2} \mathrm{O}(l)\)

If a chemical reaction is exothermic, what can be said about the sums of the bond strengths in the products and reactants? What does an endothermic reaction tell us about the relative bond strengths in products and reactants?

If the enthalpy change for the following reaction $$\mathrm{C}(s)+\mathrm{H}_{2} \mathrm{O}(g) \longrightarrow \mathrm{CO}(g)+\mathrm{H}_{2}(g)$$ is \(131.29 \mathrm{~kJ} / \mathrm{mol}_{\mathrm{rxn}}\), how much heat will be absorbed by the reaction of (a) \(1 \mathrm{~mol}\) of \(\mathrm{H}_{2} \mathrm{O}(g)\) ? (b) \(2 \mathrm{~mol}\) of \(\mathrm{H}_{2} \mathrm{O}(g)\) ? (c) \(0.0300 \mathrm{~mol}\) of \(\mathrm{H}_{2} \mathrm{O}(g)\) ? (d) \(0.0500 \mathrm{~mol}\) of \(\mathrm{C}(s) ?\)

Methane, \(\mathrm{CH}_{4}\), is commonly used in the laboratory as a fuel for Bunsen burners. $$\mathrm{CH}_{4}(g)+\mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g)+\mathrm{H}_{2} \mathrm{O}(g)$$ (a) Balance the equation. (b) Give the Lewis structures of all products and reactants. (c) Calculate the enthalpy change for the combustion of \(\mathrm{CH}_{4}\)
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