Discussion In the Chemical Weathering Lab experiment, 4 different rocks were tested in 4 different substances, being 50% vinegar, 10% vinegar, soda, and distilled water. The mass of the rocks and the pH of the substances were both measured before the experiment began. The rocks were left for 5 weeks and the changes in mass and pH were observed. The reasoning for this experiment was to see how weathering would affect rocks, specifically chemical weathering.
Chemical weathering is the process where erosion and weathering happens to nature, caused by chemical reactions. One very common cause of chemical weathering is acid rain. Acid rain is when sulfur dioxide and nitrogen oxides are released into the atmosphere, then come down as precipitation.
Cadet Eric Wiggins Date: 18 September 2014 Course Name: Chem 100 Instructor: Captain Zuniga Section: M3A Identification of a Copper Mineral Intro Minerals are elements or compounds that are created in the Earth by geological processes. The method of isolating metals in a compound mineral is normally conducted through two processes.
This experiment investigated the properties of metals by seeing the reactivity of metals. The metals used in this experiment were lithium, sodium, potassium, magnesium, and calcium. What was the first chemical change observed in the lab? Explain.
In the lab “All That Glitters” the objective that was focused on during the lab was calculating the density, volume and mass of various substances. The method that was used in finding the volume of the samples is called the displacement method. This is a process where the volume of the water in the graduated cylinder is calculated before and after the sample is placed. In this lab, the goal of the experiment was to identify and come to consensus about what the unknown substance might be. For this experiment, the required materials were ten pre and post pennies, unknown sample, graduated cylinder, weigh boat, water, paper towels and a weighing scale.
For this lab the knowledge to tell the difference between a chemical and physical changes was needed. To tell this the knowledge of the five signs of a chemical change was needed. These five signs are color change, odor change, production of bubbles/gas, production of heat/light, and the production of precipitate. Also prior to the lab one question was provided that needed to be answered. This question was what chemical must be present for a color change.
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 pollutants that taint rainfall is caused by the constant burning of coal and other fossil fuels, such as gas. The pollutants that are found in acid rain are sulfur dioxide, and nitrogen oxides. Acidic substances can also fall from the sky in forms other than rainfall, such as snow and hail, and can also collect on the ground, as dust or fog, and can penetrate into soil. Acid rain is extremely detrimental to soil and therefore
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The question is, how does a physical or chemical change affect the mass of a substance within a closed system? To respond to this question, my group did a lab to determine whether or not the mass would change or not. Our lab was to have a plastic bag containing baking soda, then add a cup of vinegar and a block of clay to the mix. We made sure to weight every element separately and then add them up for our total mass of 31 grams before the reaction. During the reaction, as soon as the vinegar was poured in there was a gas produced, bubbles.
Acid Rain is rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the
The substance or substances can convert into different substance or substances as a result of a chemical reaction. Some common indicators of a chemical reaction we discussed in class are, color change, forming of new substances, and energy being released, A physical change is when the original substance is still the same substance after the change. However, the physical form of the substance can be changed. For example, paper can be ripped into small pieces, the paper is still the same material but the form of it is different. An example from one of the reactions is when baking soda and acetic acid were mixed.
Materials and Methods The chemicals used to perform this experiment were distilled water, sodium chloride (NaCl), ice,
The purpose of this lab was to provide a more visible representation of reaction kinetics through dye decomposition with differing concentrations of reactants and the addition of ions within the solution. On day one of the lab, a linear relationship between absorbance and concentration of the dye was determined by creating multiple samples of dye with differing concentrations and measuring their absorbance in a spectrophotometer. On lab day two, using a similar method from day one, the absorbance of different reactions was analyzed and the rate order of both the dye and NaOH were determined to be 1 through graphical data analysis. Additional ions were introduced as a part of the experiment and the effect of the addition of KNO3 slowed down
The Wittig reaction is valuable reaction. It has unique properties that allows for a carbon=carbon double bond to form from where a C=O double bond used to be located. Creating additional C=C double bonds is valuable due to its use in synthesis. The Wittig reaction will allow the synthesis of Stilbene (E and Z) from a Benzaldehyde (Ketcha, 141).
Properties of Substances Express Lab 1)The purpose of this lab was to compare the physical properties of different types of solids and how the properties of solids are determined by their intermolecular forces and their intramolecular bonds. Then we were to classify each type of solid as either ionic, metallic, non-polar molecular, polar molecular, or network. Paraffin wax classified as a non-polar molecular, Silicon dioxide was classifies as a network, Sodium chloride was classified as ionic, Sucrose was classified as polar molecular and Tin was classified as metallic. (2)The intermolecular forces that are present in Paraffin wax are dispersion forces, because it is non-polar and carries a negative charge. Followed by Sucrose that has
Some people call it acid deposition because they say it is a more precise name due to the fact that acid rain isn’t only rain, it can fall as rain, snow, sleet, hail and anything else. Acid rain has been formed because as we release harmful gases into the atmosphere, we are lowering the pH of precipitation, creating acid rain. Acid rain can kill small organisms such as trees and fish which destroys ecosystems. Although acid rain is not known to affect humans immensely, it can however, cause health issues usually lung