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Observation of chemical changes lab report
Observation of chemical changes lab report
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Observation of chemical changes lab report
Observation of chemical changes lab report
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The lab started off by measuring critical materials for the lab: the mass of an an empty 100 mL beaker, mass of beaker and copper chloride together(52.30 g), and the mass of three iron nails(2.73 g). The goal of this experiment is to determine the number of moles of copper and iron that would be produced in the reaction of iron and copper(II) chloride, the ratio of moles of iron to moles of copper, and the percent yield of copper produced. 2.00 grams of copper(II) chloride was added in the beaker to mix with 15 mL of distilled water. Then, three dry nails are placed in the copper(II) chloride solution for approximately 25 minutes. The three nails have to be scraped clean by sandpaper to make the surface of the nail shiny; if the nails are not clean, then some unknown substances might accidentally mix into the reaction and cause variations of the result.
The purpose of this report is determine if sodium chloride is a viable option as a deicer on winter roads. To determine this, one must compare a multitude of factors. In this lab, the freezing point depression of water, enthalpy of dissolution, cost, and environmental impact will be discussed. A large factor in how effective a substance is as a deicer is it’s ability to decrease the freezing point of water. If the freezing point of water can be lowered, the outside temperature must be much colder to reach this new freezing point, resulting in less ice on the roads.
Conclusion: In Station 1- reaction 2, Station 3- reaction 1, Station 4-reaction 1, Station 5 reaction 1, Station 6-reaction 1 and 2, and Station 7- 1 and 2 there was chemical reaction because all of those mixed ionic compounds created a precipitate. However some solutions did not become insoluble and produce precipitates such as: Station 1- BaCl2 (aq) + KNO3 (aq) , Station 2- KNO3(aq) + AgNO3(aq) and KNO3(aq) + CaSO4(aq), Station 3- Na2CO3(aq) + KNO3(aq) , Station 4- NaPO4(aq) + KNO3(aq)
Throughout the experiment, copper was altered a total of 5 times, but after the final chemical reaction, solid, elemental copper returned. Each time the solution changed color, a precipitate formed, or when gas appeared, indicated that a chemical reaction was occurring. For the first reaction, copper was added to nitric acid, forming the aqueous copper (II) nitrate (where the copper went), along with liquid water, and
The first question is, After you stir and mix the substances, could you still see the cornstarch and water? No, because they were mixed together. The second question is, Describe how the new mixture is different from the original substances. The answer for that is it looks like a liquid, feels like a solid, but when you touch it, it drips. Another question is, Was the new mixture made from a physical change or chemical change?
Factors that affect chemical reactions Intro: this experiment is to show us what factors affect the rate of a chemical reaction. Supplies: The Works Liquid Toilet Bowl Cleaner, TUMS antiacid tablets, a non-serrated knife, a spoon, a stirring rod, four test tubes, flame heater, a small beaker for the boiled water, rubber gloves, and safety goggles. Procedure: we filled a beaker 3/4 of the way full with tap water and brought the water to a boil. We then labeled our test tubes 1,2,3,4.
The next thing we tested was the way the red worms reacted towards chemical stimulus. What types of stimulus attracted them the most? In this lab we applyed a couple drops of each substance on a paper towl and observed the way the worms reacted towards it. Our
Each sample of solution #3 being tested by the three reagents will have the most noticeable change in color in result of a positive reaction between solution #3 and the reagent. 5. We took three samples of three solutions, a positive control, and a negative control (fifteen test tubes total.) Each sample was tested by Benedict’s, Biuret’s, and Lugol’s Reagent for a reaction. The result of the reaction was then recorded in notes.
Introduction: The purpose of this experiment is to demonstrate the different types of chemical reactions, those including Copper. There are different types of chemical reactions. A double displacement reaction is a chemical process involving the exchange of bonds between two reacting chemical species. A a decomposition reaction is the separation of a chemical compound into elements or simpler compounds and the single-displacement reaction is a type of
How does the amount of baking soda mixed with vinegar affect the volume of gas produced per 10 seconds? A reaction is when (usually) a solute acts on a solvent to create a reaction. An example of a reaction is an explosion, Here we will be using baking soda and vinegar which are our two components which will cause for a reaction to take place. Reactions can be affected by several things such as temperature, concentration and the presence or absence of a catalyst which is a substance which can increase the rate of reaction.
Everyone knows the simple and easy experiment of vinegar and baking soda, but do you really know how it works. This paper will not only explain what makes these two very different chemicals react, but also what materials you will need to accomplish this easy science experiment. Baking soda and vinegar are two different chemical with two very different uses, they are not really even supposed to be used for a science experiment, take vinegar for example, some individuals use vinegar for cooking. Baking soda has a very different use, it is used for bee-stings. When vinegar and baking soda are combined, the hydrogen ions in the vinegar interact with the sodium and bicarbonate in the baking soda.
Then the balloon is lifted up so that the baking soda runs into bottle to react with the vinegar inside. Immediately the balloon is inflated by the carbon dioxide formed. The baking soda is kept constant when the experiment is repeated for another different amount of vinegar. Results/Findings When sodium bicarbonate and vinegar mix,
Lab Report Experiment 6 Rates of Chemical Reactions By Nikhola Mirashirova Lab Partner: Dina Abetova Section 3, Saturday October 31, 2015 Introduction Rate reaction is the measure of the change in concentration of the reactants or the change in concentration of the products per unit time.1,2 Rate law for this experiment: Rate = k(I-)m(BrO3-)n(H+)p There are several factors which affect the rate of reaction: catalyst, reactant concentration, and temperature.1,2 A catalyst is a substance that changes, increases or decreases, the rate of a chemical reaction but is not being used up during the reaction.3 It provides an alternative way, so that the rate of reaction changes.4 Catalyst, which is used in this experiment, is (NH4)2MoO (0.5 M).
Chemistry Essay: Impact of the use of chemical reactions on the efficiency of a car In this essay I will explore two chemical reactions and how they impact the efficiency of a car. I have chosen to talk about airbags, and nitrous oxide. I will explain how they work, how they enhance a car and talk about how the implication of science has solved everyday problems of a car. Lastly I will talk about what affect these chemical reactions have on the environment.
Did you ever blow balloons on your birthday, and the air accidentally escaped turning the balloon to its normal form again? This change is called a physical change. However, If you burned the balloon it’ll be a chemical change. Chemical change is any change that results in the formation of new chemical substances1. Meaning that it turns to a whole different thing, such as a paper burning and turning to ashes.