Oobleck Reaction Lab

The purpose of doing this lab was to apply the knowledge of chemical reactions to identify an unknown substance. Research was done prior to doing the experiment to provide a basic understanding of the chemical reactions occurring. There are two elementary aspects a chemical solution. First, there’s the reactant. The reactant is the substance added that reacts with another chemical, after the chemical reaction has run its course, what is left is called the product. There are about seven ways to tell if a chemical reaction has taken place; a few of which include color change, precipitate, the formation of gas, and temperature change. In this particular experiment, the question that was being investigated was: What is the unidentified chemical substance? The hypotheses made was: The unnamed chemical is Calcium Chloride considering each are clear liquids.

A chemical reaction is when substances (reactants) change into other substances (products). The five general types of chemical reactions are synthesis (also known as direct combination), decomposition, single replacement (also known as single displacement), double replacement (also known as double displacement), and combustion. In this lab, the five general types of chemical reactions were conducted and observations were taken before, during, and after the reaction. Then the reactants and observations were used to determine the products to form a balanced chemical equation. The purpose of this lab was to learn and answer the question: How can observations be used to determine the identity of substances produced in a chemical reaction?

What is the percentage yield of the reaction of iron and copper chloride when steel wool and copper chloride dehydrate are used as reactions?

Day 1. Michael was coming home for vacation from college. When he got home he found out that

Is A+C a chemical reaction? Yes, because of serval chemical changes happening to the solution before and after. I came to this conclusion by using three pieces of evidence. The three pieces of evidence were a ph imbalance, a dramatic density rise, and a change in electroconductivity.

The main objective is not only to reach the optimum ratio to generate the greatest amount of heat and temperature, but also to maintain a constant volume throughout the entire experiment.

: During each reaction, something happened. During reaction 1, after adding the nitric acid a red-brown gas was created. The copper first turned green after a few minutes turned into a blue solution. Reaction 2, When acid was added a blue precipitate formed. Reaction 3, when heated the solution turned into a black precipitate.

Jack Zhou Eric Lonrenzo Chemistry section # Date Chemical Reactions Introduction: The purpose of the lab was to create and observe the 4 kinds of chemical equation, and to identify reactants and products of those reactions.

Texture: It feels like a wash sponge,but a little more softer and kind of gooey.

For this experiment we are looking to determine the equilibrium constant KC for this reaction, KC = [FeSCN2+]/([Fe3+]•[SCN-]. Using a spectrophotometer, we are going to determine the absorbance of FeSCN2+ with different concentration measurements.

In this lab, we tested how chemical reactions happen when enzymes and reaction rates are effected. For the chemical reaction, we broke down the substrate ONPG into galactose and o-nitrophenol. Using ONPG as the substrate allowed us to see what was actually going on. When breaking down ONPG, the o-nitrophenol turns yellow, unlike lactose which is colorless. There are two ways in which we can manipulate the reaction rate and activation energy in this experiment. Increasing the heat by exposing enzymes to higher temperatures results in faster progression with the reaction. If the temperature were to drop, the reaction rate would slow down since molecules move faster at higher rates, proving this indeed has an effect on the rate. The other option

Place a beaker in a mixture of salt and crushed ice until the temperature of the reaction mixture falls to about 0-50C. Now stirr the viscous mixture continuously, add 4 ml of fuming nitric acid cautiously drop by drop from a burette, so that the temperature of the mixture does not rise about 250C.This operation should take 10-15

Make sure to pour Solution B into Solution A, then mix throughly. Observations:​ After swirling the resulting solution, its appearance kept cycling through the color yellow and appearing colorless. However, there was constantly a small patch of blue residue caused by some undissolved starch powder. There was some gas formation during this process.

You should have a cool mixture of ice and something that is starting to look cloudy. It will be colder on the top than the bottom and most of the ice has melted. Let this mixture set until the ice completely melts. Grab the bucket and carefully pour off the water and fine white powder leaving behind the Chloroform that has settled to the bottom of the bucket. When you're pouring off the water, it may be hard to see the Chloroform, but trust me, it's in there. The Chloroform is heavier than water and falls to the bottom in a bubble looking blob. The blob will have a white powder clinging to it. Just pour off the water until you can clearly see the blob and then pour blob, water and powder into a smaller, easier to handle container. There may be some bubbles forming and rising to the top of the solution. Don't worry, this is normal and will not cause a problem…unless you try to seal the reactants up.

CSE219 OBJECT – ORIENTED PROGRAMMING LAB Cycle Sheet – I 1. Create a class that registers your details by taking reg.no, name, age and mail id. Create a function that prevents duplicate entries of objects based on reg.no. (b) 2. Create a class account that maintains acc_no, name, and balance. Perform deposit, withdrawal and statement print operations. (statement print must print all the transactions that has taken place so for – use structures inside the class to maintain the details about transactions)(b) -----------------------------------------------------------------------------------------------------3. Create a class that holds the details of the mobile phone like brand, imei, no of sim cards, phone numbers etc.,. Allow user to login