Physical and Chemical Changes - Presentation PDF

# PHYSICAL AND CHEMICAL CHANGES ## NEENA HARIDAS Physical Science Reg. No: 13971014 ## OBJECTIVE: To study the difference between a physical and chemical change. ## MATTER - Matter is everywhere. - Matter is anything that takes up space and has mass. - Matter is constantly experiencing both chemi...

# PHYSICAL AND CHEMICAL CHANGES ## NEENA HARIDAS Physical Science Reg. No: 13971014 ## OBJECTIVE: To study the difference between a physical and chemical change. ## MATTER - Matter is everywhere. - Matter is anything that takes up space and has mass. - Matter is constantly experiencing both chemical and physical changes. ## PHYSICAL CHANGE - A physical change alters the form of a substance, but does not change it to another substance. - It changes shape or size - It dissolves. - It changes phase (freezes, boils, evaporates, condenses) - Example: Making Orange Juice - Physical changes occur when matter changes its property but not its chemical nature. - Physical property changes could include a change in: texture, shape, size, color, odor, volume, mass, weight, and density. ## EXAMPLES OF PHYSICAL CHANGE - A boiled egg - Crushing an aspirin - Cutting paper - Ice melting - Sawing wood - Disappearing puddle - Dry ice ## CHEMICAL CHANGE - Chemical changes are changes matter undergoes when it becomes new or different matter. - It burns - Temperature changes without heating/cooling - It bubbles (makes a gas) - It changes color - It forms a precipitate - When a substance undergoes a chemical change, it is changed into a different substance with different properties. - To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, and presence of heat. - Example: Baking a Cake ## SIGNS OF A CHEMICAL CHANGE 1. Precipitation 2. Color Change 3. Gas Production 4. Temperature Change - A chemical change occurs when fireworks are used. Fireworks are made of metals such as magnesium and copper These change chemically as they light up the sky. ## EXAMPLES OF CHEMICAL CHANGE - Lighter fluid burning - Sugar dissolving in tea - Logs burning - Breaking water up by separating it into hydrogen and oxygen - Toast burning - Rocket fuel burning - Metal rusting - Candle burning ## IDENTIFY THE CHANGE? - Tears up paper? **Physical change** - Mixes salt and water? **Physical change** - Burns paper? **Chemical change** - Evaporates salt water? **Physical change** - Mixes vinegar and baking soda? **Chemical change** ## WRITING ACTIVITY Write a paragraph about the difference between a chemical and physical change. Give examples of each. ## THANK YOU