Exothermic Reaction Lab

To make the results of the experiment valid four variables to take into account are if the freezer is the same temperature for both tests, the water is the same water just different temperatures, the ice cube trays are the same size, and finally both trays are in the freezer for the same amount of time.

always exchanges energy with the surroundings. Energy exchange can occur as work or as heat

In this lab, there are two days. In the first day, there are is part A and part B. Part A is further divided into three experiments. In experiment one, we were to figure out the heat capacity of the calorimeter that we made. The next two experiment’s goal was to calculate the enthalpy of 2 reactions and using hess’s law, figure out the heat of formation of magnesium oxide. In a reaction, there are

Question: Will changing the water temperature affect how quickly a gummi bear dissolves in water? Hypothesis: If the temperature of the water is warmer, then the gummi bear will decrease more quickly in size than compared to cooler temperatures. Materials: Gather the following materials including: •safety equipment including: goggles, gloves, and apron •two 25 mL beakers •one graduated cylinder •one thermometer •one hot plate •8 red gummi bears from the same brand •20 mL of normal tap water in each beaker •one balance measured in grams •forceps •paper towels Procedure: 1.Gather all the materials listed above. 2.Include data tables in your experiment by doing two trials.

: 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.

In this lab, students observed reactions, or lack thereof, between metals Mg, Cu, Zn, and Fe; when placed in solutions of Hydrochloric acid (HCl), Cu(NO3)2, Zn(NO3)2, Fe(NO3)3 and Mg(NO3)2. Students were tasked with observing whatever reaction took place and recording the characteristics of said reaction. To set up the lab, students placed a piece of each metal in a pocket on a spot plate. The plates had four pockets in a row, one for each metal, and 3 rows of pockets. Students would then put a solution in each of the rows and observe the effects of that particular solution on each metal.

To improve the experiment, the methodology could be improved by having an efficient calorimeter to retain as much heat as possible, rather than just a tin can. Additionally, more trials for each of the experiments could be conducted to ensure correct and precise data is collected to determine more accurate conclusions.

The purpose of this experiment is to understand how two different reactions can lose mass in a chemical reaction, and to learn how to arrive to the results in an organized way of recording data. The two balanced equations that we worked with were:

The amount of tablets did effect the temperature of the water. Our findings made our hypothesis incorrect. The temperature of the water did increase as the number of the tablets increased also. In this experiment, the finding were quite surprising, simply because I thought that the temperature of the water will decrease as the amount of the number of tablets increased. In the real world I feel like this information would be beneficial, because it shows the reaction of an acid plus a base mixed with water.

Chemical reactions make new things by rearranging other things. In a chemical reaction, the main change that occurs relates to the way atoms are bonded to each other, in order to change those connections, bonds must be broken and new bonds be formed.

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

In the Aquarium experiment it consisted of 5 tanks: tank 1 included rocks and water , Tank 2 contained water, gravel rocks and plants, tank 3 contained gravel rocks, water, snails, tank 4 contained gravel rocks, water, snails and tank 5 contained water, gravel rocks, snails and plants. For conduction this experiment we made multiple predictions before conducting this experiment. First tank 1 we predicted that the level of carbon dioxide wouldn’t occur and also the level of oxygen. They wasn’t any activity such as plant or animal in the tank to create any process. This would be the case because they was photosynthesis or cellular respiration involved in this tank. For the data we collected from this tank determine that the prediction was

Table 1: Observations from reactions between baking soda and vinegar, and baking soda and calcium chloride.

Purpose: To measure the heats of reaction for three related exothermic reactions and to verify Hess’s Law of Heat Summation.

Overall, the experiment succeeded that the metals show the theoretical properties. Differences existed in the mathematical calculation of the actual length. These differences, however, it can be accounted for by experimental error; more over there are uncertainty on purity of the