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.
For example whip cream is white so if you add food coloring four drops and mix it up, that is a chemical reaction. Gas molecules expand in the space they're in and if there is no top they will expand out of the container
Double Replacement Lab Report Date Completed: October 8, 2015 Objective To analyze and determine if a chemical reaction occurred between two compounds using the concepts we learned in class. Also, if the chemical reaction occurred, to determine if it formed a precipitate or gas. Safety General Safety Precautions: Do not touch the chemicals Use of gloves and coats are recommended, use of goggles should be required Keep the work area clean Dispose of the chemicals properly, DO NOT dispose them in the sink Clean up your work station Wash your hand before and after the lab Make sure all chemicals are labeled correctly NEVER return chemicals to reagent bottles Use the wafting technique to smell the chemical Clean up spills immediately
1. A bacterial transformation is when a foreign DNA is inserted into the bacteria's original DNA to alter the genome for a certain outcome. This is usually done by using a plasmid to transfer and incorporate the foreign DNA into the original genome. First, bacterial cells are centrifuged to make a pellet.
Introduction During this lab, students observed that not all substances dissolve at the same rate. Many factors involved including the independent and dependent variables affect how distinct substances dissolve. Overall, the chemical reaction, “the amount of reactant that changes the product in a given time”, played an important part in this experiment, when proven how a substance can change into another element by either emitting or absorbing energy. (Tro, 2018).
Endothermic reactions absorb energy while exothermic reactions release it. 2.3 How is matter classified? pure substance - matter composed of only one kind of atom or molecule mixture - a collection or two of more pure substances physically mixed together homogeneous mixture - a mixture containing substances that are uniformly distributed heterogeneous mixture - a mixture containing substances that are not evenly distributed phase - any part of a system that has uniform composition and properties elements - the 109 simplest substances from which more complex materials are
As the water was added to the heated sample, the solid copper chloride began to dissolve into a pretty blue-green solution, as a result of the compound breaking apart into individual Cu2+ and Cl- ions. When the water was first mixed with the copper chloride, it dissolved the solid pretty slowly, turning into a sort of mush at first. However, eventually, the water dissolved all of the solid copper chloride and the solution was homogenous. Since the compound just changed physical form, from solid to liquid, this change was purely physical. Just as in the first part of the experiment, the chemical character of the compound was not altered, so the compound did not experience a chemical change.
First it is organized into one chapter for each state of matter. Then it then has two additional chapters, one explaining the transition between states of matter and one hiliting the uses of each state. This resource rich book includes all of the necessary information to serve as a science reference for all three states of matter. It uses scientific terms yet keeps the text simple and clear. This book is also filled with fantastic pictures showing a variety of real world examples and up close scenarios where solids, liquids and gasses are in their transition phase.
The melting point for lauric acid in this experiment was 50℃. Explain what is happening during each section of the graph for both cooling and heating in terms of particle motion and energy. When heat is added to a substance the particles in the substance vibrate faster and when vibrate faster the space between the particles increases.
The purpose of this lab was to measure the mass and volume of CO2 gas and calculate its density. To conduct this experiment, the group must have made sure that when moving the collecting bottle, the mouth of the bottle is covered by a group member’s hand. Also, the rubber tube must be taken out from the collecting bottle before taking out the stopper on the test tube. During this experiment, it was determined that it is important to keep the mouth of the collecting bottle covered with a group member’s hand while removing it from the water in order for nothing to come out and nothing to come in, keeping it a closed system. It was also determined that the volume of displaced water in the collecting bottle is the same as the volume of the gas because they both took
The flux ration of oxygen and hydrogen was 1:2 and combustion was maintained for a long time5. At the bottom of the apparatus’s container, the water that was created from the experiment was collected. The total mass of oxygen and hydrogen was approximately the same in the water as it was in the gas; this proved that water was not an element. Lavoisier proved that water was a compound made of hydrogen and oxygen, with a weight percentage of 15% and 85%,
A phase of matter is a uniform with respect to both its physical and chemical properties. Matter undergoes phase transitions that change from one phase to another. A state of matter is a form that matter can take such as solids, liquids, gases, and even plasmas. There are some other states of matter that appear under extreme conditions but these are the main ones you use in your everyday lives. For example, imagine you have gatorade and water.
Diffusion is the movement of particles from a higher concentration
This lab contains two experiments that both test the knowledge of the gas law and how it applies to the state that is necessary to form a cloud and to calculate the rate of effusion of CO2 (carbon dioxide) leaving a balloon. If carbon dioxide is placed into a balloon for a period of time, then the carbon dioxide will effuse out of the balloon at a linear rate, because of the pressure that the gas is placing on the wall of the balloon that will allow it to escape from the balloon's microscopic pores. If a match is placed into a flask with room temperature water and heated water, then the resulting cloud that forms in the heated water will have a higher volume and a higher pressure than the cloud that forms in the room temperature water. The
Yes, the steel ball rolling on the counter top moves with a constant velocity. The steel ball took 0.4 sec to cover a distance of 20 cm. The formula to calculate average speed equals to total distance over total time. So, 20 cm divided by 0.4 sec equals to 50 cm/sec. So the speed of the ball is 50 cm/sec.
