Physical or Chemical Change Chemistry 1 Chopping wood

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Physical or Chemical Change? Chemistry

Physical or Chemical Change? Chemistry

1. Chopping wood (Chopping = cutting into large pieces) 2. Wood becoming sawdust (Sawdust

1. Chopping wood (Chopping = cutting into large pieces) 2. Wood becoming sawdust (Sawdust is the small particles of wood that fall to the ground when you cut wood. ) 2. Physical change… because the bits of dust are STILL made of WOOD. 1. Physical change… because after the wood is chopped, it is STILL made of WOOD.

1. 2. Burned logs 2. Sugar dissolved in water (Dissolved = melted. When sugar

1. 2. Burned logs 2. Sugar dissolved in water (Dissolved = melted. When sugar dissolves in water, you cannot see the sugar anymore, but it’s there. ) Physical change… because the sugar still exists; it is just broken up into bits in the drink. 1. Chemical change… because the wood turns into smoke & ash. It cannot be changed back into WOOD.

1. Salt and pepper mixed together 2. Physical change… because the substances have NOT

1. Salt and pepper mixed together 2. Physical change… because the substances have NOT changed into new substances. 2. Putting salad dressing on salad 1. Physical change… because the salt and pepper still exist; they are just mixed with each other.

1. Fruit salad tossed together (“Tossed together” = mixed together) 2. Rusting bike (Rust

1. Fruit salad tossed together (“Tossed together” = mixed together) 2. Rusting bike (Rust occurs when metal reacts with oxygen. The oxygen is destroying the metal and breaking it down into very small pieces. ) 2. Chemical change… because the metal is CHANGED into a NEW substance called RUST. 1. Physical change… because the fruit has not changed into different substances.

1. 2. Gasoline burning (Inside an engine, gasoline burns (combusts) to produce energy so

1. 2. Gasoline burning (Inside an engine, gasoline burns (combusts) to produce energy so the car can go. ) Liquid water freezing (Liquids freeze when they get cold and turn into a solid. ) 2. Physical change… because the substance is STILL water, even though it’s frozen solid. 1. Chemical change… because when something BURNS, it turns into NEW substances like smoke and smog.

1. 2. Rocket fuel igniting (Ignite = to start a fire. When rocket fuel

1. 2. Rocket fuel igniting (Ignite = to start a fire. When rocket fuel burns, it produces energy to make the rocket go. ) 2. Ice melting (Something melts when it changes from a frozen solid to a liquid. ) Physical change… because it is STILL made of the same substance (water). 1. Chemical change… because when something burns, it turns into NEW substances like smoke.

1. 2. Minerals forming (Minerals form deep within the earth when certain elements are

1. 2. Minerals forming (Minerals form deep within the earth when certain elements are changed due to the intense heat and pressure inside the earth. ) Glaciers melting 2. Physical change… Because it’s STILL all water…nothing new is made. 1. Chemical change… because NEW substances are made.

plants decomposing 1. Dead (Decomposing = the nutrients from 2. something that was once

plants decomposing 1. Dead (Decomposing = the nutrients from 2. something that was once alive, but now is dead, are going back into the ground and can be used again by other plants. ) 2. Silver tarnishing (Tarnish forms on silver when the silver reacts with the oxygen in the air. It forms a greenish-black substance on the silver that can be removed with special polish. ) Chemical change 1. Chemical change

1. Firecrackers exploding 2. Physical change 2. Ocean water evaporating and leaving salt behind

1. Firecrackers exploding 2. Physical change 2. Ocean water evaporating and leaving salt behind (Evaporation occurs when water molecules float up into the air to form clouds. Anything that was in the water will stay behind. ) 1. Chemical change

1. Saliva dissolving starch in food (Saliva = the water your mouth produces. To

1. Saliva dissolving starch in food (Saliva = the water your mouth produces. To dissolve = to break down into very small pieces using water. Starch = carbohydrates, a type of energy in food. ) 2. Saliva breaking the chemical bonds of meat protein (The liquid in your mouth reacts with the meat to separate the protein so your body can absorb it. ) 2. Chemical change 1. Chemical change

1. A tree’s leaves changing color in the fall (The leaves turn color because

1. A tree’s leaves changing color in the fall (The leaves turn color because they are dying. ) 2. Physical change 1. Glass breaking Chemical change

1. 2. Baking Bread Physical change 2. 1. Paint Drying Chemical change

1. 2. Baking Bread Physical change 2. 1. Paint Drying Chemical change

1. Making Kool-Aid 2. Chemical change 2. 1. Milk souring Physical change Good →

1. Making Kool-Aid 2. Chemical change 2. 1. Milk souring Physical change Good → Bad

1. A rotting log 2. Physical change 2. Making an ice sculpture 1. Chemical

1. A rotting log 2. Physical change 2. Making an ice sculpture 1. Chemical change

1. Burning a candle 2. Chemical change Penny turns green 2. A (Pennies are

1. Burning a candle 2. Chemical change Penny turns green 2. A (Pennies are made of the element copper. Copper reacts to oxygen in the air by forming a green or brown coating. ) 1. Chemical change

1. An Alka-Seltzer in water (When the chemicals in the medicine combine with the

1. An Alka-Seltzer in water (When the chemicals in the medicine combine with the water, carbon dioxide gas is released and the medicine dissolves into the water. ) 2. Tearing a piece of paper in two 2. Physical change 1. Chemical change

1. Reacting substances 2. Physical change 2. Mixing blue and red paint to make

1. Reacting substances 2. Physical change 2. Mixing blue and red paint to make purple 1. Chemical change + =

1. A magnet sticking to a refrigerator heat or electricity 2. Conducting (The eye

1. A magnet sticking to a refrigerator heat or electricity 2. Conducting (The eye on the stove conducts (carries) heat to the pan, and the pan conducts heat to the food. The molecules in air conduct (allow to travel) lightening. ) 2. Physical change 1. Physical change

1. Cooking pancakes 2. THE END 2. 1. That’s all. Chemical change

1. Cooking pancakes 2. THE END 2. 1. That’s all. Chemical change

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