Chapter 1: Chemistry in Our Lives – Introduction to Chemistry, Matter, and Chemicals

Chapter 1: Chemistry in Our Lives

Introduction to Chemistry

Chemistry is a central science that explores the composition, structure, properties, and changes of matter. It is fundamental to understanding the substances that make up the world and the processes they undergo.

• Chemistry is the study of the composition, structure, properties, and reactions of matter.

• It helps explain everyday phenomena, such as how antacid tablets neutralize stomach acid or how toothpaste prevents cavities.

• Applications of chemistry are found in medicine, food, cleaning products, and many other aspects of daily life.

• Example: The chemical reaction that occurs when an antacid tablet is dropped into water, producing bubbles of carbon dioxide gas.

Learning Objectives

• Define the term chemistry and identify chemicals.

• Describe the scientific method and its role in scientific inquiry.

• Review key math skills for chemistry, including writing numbers in scientific notation.

What Is Chemistry?

Chemistry investigates the substances that make up the universe and the changes they undergo. It is essential for understanding biological, environmental, and physical processes.

• Definition: Chemistry is the study of the composition, structure, properties, and reactions of matter.

• Matter refers to anything that has mass and occupies space.

• Example: Antacid tablets undergo a chemical reaction when placed in water, demonstrating a chemical change.

Matter

Matter is a term used to describe all substances that have mass and take up space. Everything around us, including solids, liquids, and gases, is considered matter.

• Examples of matter:

  • Antacid tablets

  • Water

  • Glass

  • Air

• Energy, such as sunlight, is not matter because it does not have mass or occupy space.

Chemicals

Chemicals are substances with a definite composition and set of properties. They can be naturally occurring or synthesized by chemists and are found in everyday products.

• Definition: A chemical is a substance that always has the same composition and properties wherever it is found.

• Everyday products, such as toothpaste, are mixtures of many chemicals.

• Example: Toothpaste contains chemicals that clean teeth, prevent cavities, and provide flavor.

Chemicals in Toothpaste

Toothpaste is a common example of a product made from a combination of chemicals, each serving a specific function.

Chemical	Function
Calcium carbonate	Used as an abrasive to remove plaque
Sorbitol	Prevents loss of water and hardening of toothpaste
Sodium lauryl sulfate	Used to loosen plaque
Titanium dioxide	Makes toothpaste white and opaque
Sodium fluorophosphate	Prevents formation of cavities by strengthening tooth enamel
Wintergreen flavor (methyl salicylate)	Gives toothpaste a pleasant flavor

Identifying Chemicals in Everyday Life

Many substances we encounter daily are chemicals or mixtures of chemicals. Recognizing this helps us understand the role of chemistry in our lives.

• Examples of items containing chemicals:

  • Fruit

  • Milk

  • Breakfast cereal

• Sunlight is not a chemical; it is a form of energy.

Practice Problem

Read the labels on products used to wash dishes. Identify the names of 2-3 chemicals contained in those products.

• Example answers: Sodium chloride, sodium carbonate, sodium lauryl sulfate.

Additional info:

• The scientific method and scientific notation are mentioned as learning objectives but not detailed in the provided content. These topics are foundational for future chapters.