Changes in Matter Types of Changes Two Types

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Changes in Matter

Changes in Matter

Types of Changes: Two Types of Changes Physical Change Chemical Change

Types of Changes: Two Types of Changes Physical Change Chemical Change

Physical Change: ¡ ¡ Does not change the chemical composition or the nature of

Physical Change: ¡ ¡ Does not change the chemical composition or the nature of a substance Process is easily reversible Ex. l Crumpling & smoothing out paper Freezing water and thawing ice Sublimation – from solid to gas (ex. dry ice (CO 2) or iodine)

Tells you a physical change occurred ¡ Key Words: l Crush/Pulverize l Melt l

Tells you a physical change occurred ¡ Key Words: l Crush/Pulverize l Melt l Evaporation l Condensation l Sublimation l Solidification l Dissolve

Chemical Changes: ¡ ¡ ¡ Changes the chemical composition or make-up of the substance

Chemical Changes: ¡ ¡ ¡ Changes the chemical composition or make-up of the substance New substances are formed with new properties Not easily reversible (Reversible only through chemical means or reactions) Rust

Signs of Chemical Changes: ¡ Formation of a gas ¡ Formation of a precipitate

Signs of Chemical Changes: ¡ Formation of a gas ¡ Formation of a precipitate ¡ Change in color ¡ Production of heat &/or light ¡ Increase or decrease in mass Tells you a chemical change occurred

Physical Change -Sublimation -Freezing -Condensation -Evaporation -Pulverization (crush) -Solidification -Dissolving Chemical Change - Burning

Physical Change -Sublimation -Freezing -Condensation -Evaporation -Pulverization (crush) -Solidification -Dissolving Chemical Change - Burning - Neutralization - Combustion - Corrosion (rusting)

Which of the following are examples of physical changes? 1. Melting Butter 2. 3.

Which of the following are examples of physical changes? 1. Melting Butter 2. 3. 4. Rusted Car Dissolving Sugar 6. in Tea Crushing Rock 5. Condensation Burning Wood

Which of the following are examples of chemical changes? 1. Cooking an egg 2.

Which of the following are examples of chemical changes? 1. Cooking an egg 2. 3. 4. Rotting food Sublimation of Dry Ice Freezing Rain 5. 6. Burning a candle Crumpling Paper

Where You carry didout a chemical the following steps of an change occur? experiment

Where You carry didout a chemical the following steps of an change occur? experiment A physical & record your observations. change? 1. You place a powder in a test tube 2. You heat the test tube. You notice that a colorless gas & a coppercolored liquid are produced. 3. You collect the copper-colored liquid & cool it. It becomes a solid.

Activities: ¡ Physical ¡ Student 1 -16 Science Worksheet #2 Study Guide – Mod

Activities: ¡ Physical ¡ Student 1 -16 Science Worksheet #2 Study Guide – Mod 1 -14 -