Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Concept explainers
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Question
Which is an example of a physical change?
Transcribed Image Text:**Understanding Physical and Chemical Changes**
*Physical Change vs Chemical Change:*
To understand the difference between physical and chemical changes, let's analyze this question:
**Question:** Which is an example of a physical change?
1. **ice melting**
2. gasoline burning
3. food being digested in your stomach
4. a nail rusting
**Explanation:**
- **Physical Change:** This type of change affects the form of a chemical substance, but not its chemical composition. The molecules are rearranged, but their internal structure remains the same.
- *Example:* Ice melting. When ice melts, it changes its state from solid to liquid, but its chemical composition (H₂O) remains unchanged.
- **Chemical Change:** This change occurs when a substance combines with another to form a new substance; this process is called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
- *Examples:*
- **Gasoline burning:** A combustion reaction where gasoline reacts with oxygen to produce carbon dioxide, water, and energy.
- **Food being digested in your stomach:** Enzymatic reactions break down complex molecules into simpler substances.
- **A nail rusting:** Iron reacts with oxygen to form iron oxide, a new substance.
Thus, the correct answer for a physical change from the provided options is:
1. **ice melting**
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