The purpose of the Decomposition of Baking Soda Lab was to find the correct formula with the right products, for when baking soda is heated. Scientists hypothesized that when baking soda is heated sodium hydroxide and carbon dioxide would be formed. To test this hypothesis, 2 grams of baking soda was placed into a beaker and then placed on a hot plate set to its highest temp. To do these scientists first had to measure the beaker to subtract its mass from the total of it with baking soda. Both masses were then subtracted to find that the baking soda mass after the experiment the new mass being 1.29 grams. Later the scientists balanced three given equations to find the coefficients and then used those to solve three mass-mass problems. The mass-mass
Baking Soda and Vinegar: Limiting Reactant Lab Background The limiting reactant of a chemical reaction is the substance that places an upper bound on the amount of product that the reaction can produce. The limiting reactant places this upper bound because the reaction must stop once all of the limiting reactant is consumed. If the relative amount of reactants is altered, then the limiting reactant may change accordingly.
The question I was trying to answer is Which balanced chemical equation best represents the thermal decomposition of sodium bicarbonate. Using that question to guide us we were trying to determine which of the four chemical equations show how atoms are rearranged during thermal decomposition. We concluded it was the second chemical equation, we know that because:
The Arm & Hammer Brand Baking Soda has been a staple of American life since 1846. The brand once only used for baking enjoyed a resurgence of interest in the 1970's by reinventing itself and its usefulness without changing a single ingredient. The new marketing campaign would eventually expand the Arm & Hammer brand to include deodorants, laundry detergents, cleaning supplies, and even toothpaste. An interesting history with many interesting uses in such an uninteresting little yellow box we are all familiar with, Arm & Hammer Baking Soda has become as Americana as apple pie and baseball. In fact, you probably can't even name one other brand of baking soda, can you?
Moreover, another purpose was to learn how to use different lab techniques, such as filtration and proper heating of test tubes, in order to determine the mass of products produced by the reaction. Not only that, the experiment demonstrates how transition elements can often form more than one type of reaction due to their differently charged ions, like Fe.
Purpose: The purpose of this lab is to find the ideal conditions for carbon dioxide production in yeast. Determining the ideal conditions for carbon dioxide production would help Jim Baker bake his bread as fluffy as possible in a short amount of time.
Placed a 400 mL beaker that is 2/3 full of water on a hot plate in the fume hood and brought the water to a boil. While the water was boiling, weighed and empty weighing boat then took the solid metal sample and weighed it in the weighing boat. Recorded the two weighs and subtracted the values to calculate the mass of the metal.
Thermochemistry is the study of energy changes that occur during chemical reactions and changes in state. There are two different processes that have to do with the absorption and release of heat. In the endothermic process, the system picks up heat, as the surroundings lose heat. In the exothermic process, heat is released to its surroundings. Heat either goes in or goes out.
" This means that therefore the enthalpy change of a reaction can be measured by the calculation of 2 other reactions which relate directly to the reactants used in the first reaction and provided the same reaction conditions are used, the results will not be affected. We have the problem set by the experiment to determine the enthalpy change of the thermal decomposition of calcium carbonate. This is difficult because we cannot accurately measure how much thermal energy is taken from the surroundings and provided via thermal energy from a Bunsen flame into the reactants, due to its endothermic nature. Therefore, using the enthalpy changes obtained in reaction 1 and reaction 2 we can set up a Hess cycle.
The Compound Light Microscope is a tool used to make images larger of small objects that are hard to study with your eyes. The compound light microscope, which is going to be used in this lab activity, is an instrument with two lenses and various knobs to focus the image. In this lab, we will learn about the microscope and how to properly use it (Kim, 2001). Anton van Leeuwenhoek (2001) was the first person to observe and describe single celled organisms by using handcrafted microscopes. He originally referred to these single celled organisms as animalcules which we now call microorganisms. Even though he was the first person to do all of this, however he was also the first to record and observe muscle fibres, spermatozoa, bacteria and blood flow in capillaries which are also referred to as small blood vessels. Zacharias Jansen (2001) is known to be the first creator of the compound microscope and is dated around the 1590's. There were
One of the best methods for determining mass in chemistry is gravimetric analysis (Lab Handout). It is essentially using the the mass of the product to figure out the original mass that we are looking for. Thus the purpose of our experiment was to compare the final mass in our reaction to the initial mass and determine the change in mass.
Then, we took the twelve bath bombs out of the molds. There were four different kinds: citric acid, lemon juice, cornstarch, and cream of tartar. Three bath bombs of each of the four kinds to have three trials to ensure the consistency of the experiment. 1000 mL of room temperature tap water was put into a 2000 mL container that was used to allow the bath bombs to react. We plugged in the balance and zeroed it. We then placed an empty plastic cup on the balance to calculate its mass. Once calculated, the balance was tarred and the lemon juice bath bomb was placed in the plastic cup and the mass of each was recorded. Before putting a bath bomb into the water, the temperature of the water was taken using a temperature probe and that temperature was recorded. Then the bath bomb was placed in the water for a total of one hundred seconds. The temperature of the water was recorded in ten second intervals, zero to one hundred, as the reaction of each kind of bath bomb was taking place. Observations were recorded before, during, and after the reaction was completed. Once the one hundred seconds were over, the water was poured out, and the container of water was cleaned. For each type of bath bomb, we made sure each had the same mass before being tested. This process was repeated for each of the following bath bombs, and a new cup was used for each new bath bomb. Once all of the data was collected and recorded for
In this experiment, the calcium carbonate was in the form of marble chips. The calcium carbonate reacted with hydrochloric acid when the acid was poured into marble chips. Due to calcium carbonate’s higher reactivity, it displaced hydrogen in the hydrochloric acid. As a result, products of calcium chloride, carbon dioxide and water were formed. As the chemical reaction occurred, the water in the measuring cylinder was displaced and gas bubbles that were blowing out represented carbon dioxide.
We can see oxygen bubbles being let through the glass tube into the beaker. This shows the decomposition of H2O2 . Start the stopwatch and also start counting the no. of bubbles produced. 4) Note down the results for every minute, up to 5 minutes. 5)
First, the mass of the beaker being used was recorded, then about 1g of baking soda was added and the mass recorded. Next, the mass of just the baking soda was found and recorded. Then, the contents were boiled until dry then weighed and mass recorded after cooling off. Finally, the mass of jus the salt, or sodium chloride, was found and recorded.
borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may