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Chemical Properties of Matter — Reading Comprehension

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This engaging middle school science passage explores the chemical properties of matter, focusing on how these properties are observed only during chemical changes. Aligned to NGSS standard MS-PS1-2, students will learn about flammability, reactivity with different substances, and toxicity. Through detailed explanations and real-world examples, such as why iron rusts but gold does not, and why baking soda fizzes with vinegar, students gain a deep understanding of underlying mechanisms and cause-and-effect relationships in chemistry. The passage integrates key academic vocabulary, a glossary, and comprehension activities, making it ideal for grades 6-8. Audio integration and Spanish translations support diverse learners. Graphic organizers and writing prompts encourage higher-order thinking, analysis, and application of scientific concepts.

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Chemical-properties-of-matter-2 — Examples of different chemical properties

Chemical properties are special characteristics that can only be observed when a substance undergoes a chemical change. For example, the reason iron rusts but gold stays shiny is because of their different chemical properties. Understanding these properties helps scientists and engineers choose materials for specific uses, protect the environment, and keep people safe. The study of chemical properties also reveals how substances interact in nature and in technology.

How Chemical Properties Work
At the heart of a chemical property is the way a substance reacts with other substances. Flammability is a chemical property that describes how easily something burns in the presence of oxygen. For instance, gasoline has high flammability, while water does not burn at all. Reactivity is another key property, describing how a substance responds when it comes into contact with acids, water, or oxygen. Iron is reactive with oxygen and water, which causes it to form rust (iron oxide) over time. In contrast, gold is very unreactive, so it does not rust or tarnish even after many years. Toxicity is a chemical property that measures how harmful a substance is to living things when it undergoes a chemical change inside a body.

Examples of Chemical Properties in Action
Chemical properties are observed during chemical changes. For example, when baking soda (sodium bicarbonate) is mixed with vinegar (acetic acid), a reaction occurs that produces carbon dioxide gas. This is why the mixture fizzes and bubbles. The ability of baking soda to react with acids is one of its chemical properties. The rate of this reaction can increase if the temperature is higher or if more baking soda is added. Another example is wood burning in a campfire. As wood burns, it reacts with oxygen in the air and produces heat, light, carbon dioxide, and ash. This process is not reversible, showing that a chemical change has taken place and the chemical properties of wood have been observed.

Applications and Importance of Chemical Properties
Chemical properties influence everything from material selection for buildings to food safety. Engineers avoid using reactive metals like iron in situations where rust would be dangerous, such as in bridges or water pipes. Scientists use knowledge of toxicity to prevent exposure to dangerous chemicals in the environment or in consumer products. Chemical properties also explain why some substances are used as fuels while others are used for storage or insulation. Understanding these properties allows us to predict and control reactions, solve environmental problems, and design safer products.

Chemical properties are central to all of chemistry. They help us understand how and why substances change, and how those changes affect the world. The study of chemical properties connects chemistry to biology, engineering, and environmental science, making it a foundation for understanding and improving our lives.

Interesting Fact:
The reason gold jewelry never rusts is because gold is one of the least reactive elements on Earth!

What is a chemical property?

A characteristic observed only when a substance undergoes a chemical change.A quality that can be seen without changing the substance.The shape of an object.A type of physical property.

Which of the following is NOT a chemical property?

FlammabilityReactivityColorToxicity

What happens when baking soda mixes with vinegar?

It melts.It fizzes and produces carbon dioxide gas.It becomes colder.It freezes.

According to the passage, why does iron rust but gold does not?

Iron is more reactive than gold.Gold is heavier than iron.Gold contains more oxygen.Iron is a precious metal.

Which word from the passage means 'the ability to burn'?

ReactivityToxicityFlammabilityIron oxide

What does toxicity measure?

How easily a substance melts.How much a substance weighs.How harmful a substance is to living things.How much light a substance reflects.

Why do engineers avoid using iron in bridges exposed to water?

Because iron is heavy.Because iron rusts when it reacts with water and oxygen.Because iron is expensive.Because iron is not shiny.