Cold+Pack+Experiment

When we put the Bicarb Soda in, it felt super smooth. We managed to sneak a quick feel in before the water was dropped in. It felt smoother than the Citric Acid alone. When we added the Water at first it didn’t really do much but as we put more in, it started to fizz up a little bit. (My predictions were right!!) (YAY!) It sounded like fizzy drink when it was poured into a glass. That was when the reaction occured. The water was feezing cold! We had one tonne of fizzles after a while. Eventually it started to blow up. As we opened the bag up, it died down a little bitand then died down more and more until it was time to seal it up again. It gave off a lot of gas. Then eventually the whole bag turned cold. We had to pop it now and again though. ||
 * || Indi || Madi || Kristen || Angela ||
 * What were the main things you observed during the experiment? || I saw that it bubbled and fizzed a lot when I put the water in and it made the bag puff up and expand until it looked like it was about to explode and when it dried it turned into a ice like substance. || It bubbled and fizzed and went cold when you put the water in and it expanded the bag and it smelled bad || It bubbled and fizzed a lot and it went freezing when you added in the water and it made a gas form inside so it almost exploded! ||  When I tasted Citric Acid it was very lemony and it needed lots of water afterwards. It felt really smooth in the bag though. It was only a little bit prickly.
 * What is the chemical difference between Citric Acid and Bicarb Soda? || Citric acid is and acid because it is under seven on the PH scale and the Bi-Carb soda is a base because it is over seven on the PH scale. || Citric is an acid and bi-carb soda is a base . 7 is neutral everything above 7 is a base and everything below the 7 is an acid. || Bi-carb soda is like the base and acid is the acid and citric acid is above 7 and bi-carb soda is below 7. || It made a chemical reaction with the water because Acid and BiCarb don’t mix well. It was a reaction with BiCarb over seven as it is a base and the Acid is under neutral and that is closer to Alkaline ||
 * Why did the product turn cold? || Because the endothermic drew all the heat out of the substance so it went extremely cold || Because of the endothermic sucks out all the heat.  || Because it sucks the heat out of the space inside the bag so then it makes it freezing! ||   The product tured well and truly cold becuase of the water temperature. It was frezzing cold and a cold pack is normally freezing cold so that is what explains the cold temperature of the water.   ||
 * Describe one scientific fact you learnt. || I don’t know a lot about chemistry but I learned that endothermic draws all the heat out.  || I learned what endothermic meant it means it sucks out all the heat.  || I learnt that acids are above 7 and bi-carb is below 7. ||   I learnt all about the Alkaline and the Bases and 7 is netural...all that sort of stuff. I think it was really useful and worth learning.   ||

Would have been one of the ingredients! || Before the water was added not much happened, when the water was added it bubbled and fizzed. It gradually grew colder and bubbled and fizzed, when the bag was sealed it would fill up with air until it was unsealed. || When you added water to the bi-carb soda and to the citric acid it started to bubble and fuzz the stated to draw the heat away from your hands to make it feel cold. || That’s what caused it to go cold because it drew out the heat. || Because it is endothermic, the heat is drawn out, so there is no or very little heat left, it is cold. || It is endothermic which is if you touch it, it will absorb the heat from your fingers so it feels cold. ||
 * || Gracie || Emmaby || Kate ||
 * What were the main things you observed during the experiment? || I saw the change that happened over time and the cycle of the change. It was interesting how it bubbled and fizzed after you added water and went cold because it was endothermic.. I never would have thought citric acid
 * What is the chemical difference between Citric Acid and Bicarb Soda? || citric acid is an acid or an alkaline. bi carb soda is a base. A base is over neutral, 7,[ which means the level of the balance]and an acid is under neutral.  ||  Citric Acid is an Alkaline which means on the PH scale it is under 7. Bicarb Soda is a base which means on the PH scale it is over 7.  || Citric acid is an alkaline which is a acid and bicarb soda is a base so on the ph scale it is over 7 and with the citric acid it is under 7. ||
 * Why did the product turn cold? || Because it was endothermic. it means that it draws the heat out of the mixture or the substance.
 * Name one scientific fact you learnt. || I learnt about the word endothermic, what it meant and also i learnt about the reaction of bi carb soda and water.  ||  I learnt about the PH scale and what it means: it goes from 0-14, 7 being neutral. Anything over 7 is a BASE. Anything under 7 is a ALKALINE or ACID.  || I lernt what endothermic means it means that when you touch something that is endothermic it will suck up the heat from your fingers or where ever you touched it. ||