Ingmar



By Ingmar Chen 1, what is dry ice? Answer: Dry ice is frozen Carbon Dioxide, or CO2, which is a gas under standard temperature and pressure conditions. The atmosphere contains about .035% of this gas. CO2 is a greenhouse gas, which means it absorbs light at infrared wavelengths. An increase in the concentration of this gas would, some scientists believe, cause an increase in the atmosphere's average temperature. The high concentration of CO2 in the atmosphere of the planet Venus is said to contribute to that planet's high average temperature. At normal atmospheric pressure on //this// planet, frozen CO2 doesn't melt into a liquid, but rather evaporates directly into its gaseous form. Hence the name //dry// ice. This process is called //sublimation.// All of the experiments below rely on this property of dry ice. 1 pound of dry ice, when it "sublimes" (turns to gas) will produce 250 liters of gas at atmospheric pressure, enough to fill 125 2-liter bottles. That's a lot of gas! ([|http://www.west.net/~science/co2.htm]) 2, Once I got hurt by dry ice, how cold is dry ice? Answer: Dry ice have a extreme cold temperature (-78.5oC, or -109.3oF), dry ice can cause damage to the skin if handled. 1, Grab an uninflated balloon and force the neck open with the index and middle fingers of both hands, stretching the balloon open. This will allow you to drop in one or more pellets of dry ice. 2, Tie the balloon closed.
 * Investigation into Matter – Exploring dry ice **
 * Questions of this topic:**
 * Experience 1:**
 * Inflate a balloon-can the carbon dioxide in dry ice inflate a balloon?**
 * Hypothesis:** The balloon will inflate bigger and bigger
 * Procedure:**

After 5 minutes || The balloon inflated bigger like a table tennis ball || After 10 minutes || Big like a tennis ball || After 20 minutes || Big like a small football || The balloon keeps getting bigger and bigger until the dry ice inside it is gone. || Why? There are carbon dioxide in dry ice. The balloon was inflated by the carbon dioxide released from dry ice. 1, Find a big metal spoon and set it on the table. 2, Put a dry ice on the spoon The spoon started to “sing” when I putted the dry ice on the spoon. Why: The metal spoon is very “warm” for a -76degree dry ice. dry ice to instantly turn to gas when it contact to the “warm” spoon, 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 I hear.(some information comes from [|http://www.west.net/~science/co2.htm]) 1. Get a cup of water 2. Put some dry ice in the water. Fog came out from the cup until the dry ice disappear, When i place dry ice into some warm or hot water, clouds of white fog are created. This white fog is not the CO2 gas, but rather it is condensed water vapor, mixed in with the invisible CO2. The extreme cold causes the water vapor to condense into clouds. The fog is heavy, being carried by the CO2, and will settle to the bottom of a container, and can be poured. You can produce enough ground - hugging fog to fill a medium sized room with a pound or so of dry ice. Do not allow anyone to lay down in this fog, or allow babies or pets into it, as CO2 gas does not support life. Dry ice fog allows low powered laser beams to be seen (some information come from ([|http://www.west.net/~science/co2.htm]) 1. Get Phenolphthalein in the a cup mix with water and it 2. Put in dry ice 3. Observe the solution
 * Observation:**
 * Experience2- what will happen if we put a dry ice on a metal spoon?**
 * Procedure:**
 * Observation:**
 * Experience3,-What will happen if we put dry ice in water?**
 * Fog effect:**
 * Procedure:**
 * Observation:**
 * Why?**
 * Experience 4:-clear the pink water!**
 * Procedure:**
 * Observation:**