Presentation on theme: "Dry Ice Lab. Warnings and precautions Dry ice is very cold (-78.5 o C, or -109.3 o F) No direct contact with skin (use tongs, paper towels, gloves etc…"— Presentation transcript:
Warnings and precautions Dry ice is very cold (-78.5 o C, or -109.3 o F) No direct contact with skin (use tongs, paper towels, gloves etc… Goggles must be worn at all time! Do not eat dry ice directly! To high of a concentration of CO 2 in the air will make people dizzy Do not keep in closed environment for long time as concentration of CO 2 continues to increase with use
Storing and Transporting Dry Ice Dry ice continuously sublimates as heat enters it from the surrounding air and objects. The CO 2 gas that evolves must be vented from the container or pressure inside the container builds. A Styrofoam (polystyrene foam) ice chest with a loose fitting lid makes a good container for transporting dry ice. Top will pop off if too there is too much gas pressure
Handling Dry Ice Due to its extremely cold temperature, dry ice can cause damage to the skin if handled for any length of time. Use tongs or gloves when handling dry ice. It is also important when crushing or grinding the solid not to get any of the dust into your eyes. Wear protective goggles.
Witches Brew, Fog Combine hot water and dry ice into one beaker. For the fog to continuously flow, used a hot plate or crock pot The hotter the water and smaller the pieces of ice, the greater the amount of fog
Dry Ice on the table Obtain a small piece of dry ice and place on table After a short while, it starts to move on its own, as if it where on an air hockey table! The surface of dry ice sublimates as it comes into contact with the table. A layer of CO 2 gas forms as a result between ice and table
Ringing spoons, whistling washers a.Place the spoon in the table, put a small piece of dry ice in it. b.Hold a warm spoon or washer by its handle, then press it firmly against a chunk of dry ice. c.If there is a different flat metal object, repeat the experiment using that
The reason for the sound The spoon will scream loudly as the heat of the spoon causes the dry ice to instantly turn to gas where the two make contact. The pressure of this gas pushes the spoon away from the dry ice, and without contact, the dry ice stops sublimating. The spoon falls back into contact again, and the cycle repeats. This all happens so quickly that the spoon vibrates, causing the singing sound you hear.
Frosting a washer Leave the spoon or washer in contact with the dry ice for an extended time Leave dry ice in canister or soda bottle for extended time. Frost is created because the water vapor in the surrounding air loses enough energy to change into the solid phase
Film Canister Combine film canister and a piece of dry ice Place piece of dry ice, inside film canister Put film canister top side down on a flat surface Point away from every one else! Wait awhile, as the dry ice sublimates, gas pressure of the created CO2 increases inside the canister until the point where there is more pressure pushing top away than holding it in
Smoking Bubbles Need dry ice, warm water, 1 tablespoon of dish detergent, food coloring Place dry ice and warm water in container, then add detergent, and a couple drops of food coloring The CO 2 fog is captured inside of the bubbles
What you need for this experiment: 2 Balloons with openings large enough to fit a plastic bottle opening Empty plastic soft drink bottle Small pieces or large pellets of dry ice Tongs to hold the dry ice Two people
What to Do: 1.Blow up one of the balloons and tie it off. 2.Save the balloon for later. 3.Remove the lid of the plastic bottle. 4.Have one person hold the plastic bottle upright. 5.Using tongs and wearing insulated gloves, take a few small pieces of dry ice and put them into the plastic bottle. 6.Fit a balloon over the opening of the bottle. 7.Watch the balloon inflate with carbon dioxide as the dry ice sublimates. 8.To make the balloon inflate faster, shake the bottle gently. Air currents make dry ice sublimate more quickly into carbon dioxide? 9.When the balloon is fully inflated, remove it from the bottle and tie it off. 10.Go and get the first balloon that you blew up with your own breath. 11.Toss up both balloons into the air.
Balloons and dry ice Wearing insulated gloves and using tongs, pick up a piece of dry ice and touch it to the balloon that you blew up with air [not the one you filled with carbon dioxide]. What happens to the balloon?
Hero’s engine 1.Using a push pin, or a straight pin held in pliers, poke two holes into opposite sides of a film can, near the bottom. 2.The holes should be off - center, like pinwheel rockets. Tie a loop in a length of thread. 3. The loop should fit loosely over the cap of the film can, so that when you loop it over the cap, and snap the cap onto the can, you can hold the can by the remaining length of thread. 4. Place a small piece of dry ice into the can. Then quickly add some warm water, and close the lid, with the thread attached. 5. Lift the can by the thread, and watch what happens.