Introduction: As a class, we were each given our own individual compounds. The goal to figure out, through a series of tests, what the compound was. The reason we did this was to understand that the properties and behaviors of a compound are all we need to correctly identify them, and not just knowing the name of them. The experiments that I used were, the solubility test, the conductivity test, and the flame test. The solubility test tests how a substance is able to dissolve in a different substance, in our case water. The conductivity test shows the degree to which the solution conducts electricity. The flame test uses the heat of the flame to excite the electrons into a higher energy level and creates kinetic energy. This releases energy waves that produce light, specific to the metal being burned. Method: …show more content…
I put distilled water into a section of my well plate and added a small scoop of my compound into it. Another reason that I decided to do it first was that once dissolved, I put the conductivity meter into the well plate which was the most time efficient. Once I conclusively figured out my compound was ionic I moved on to the flame test. The flame test only works on ionic compounds, so doing it after knowing that the test would return helpful evidence made the most sense. After all three of these tests, there was enough evidence to make a conclusive answer to the original question of, what compound is
The purpose of this lab was to be able to use physical characteristics to determine the identity of an unknown compound. The data from this experiment classified aluminum as metallic; ascorbic acid, paraffin, palmitic acid, sucrose, graphite, and water as molecular; sodium chloride as ionic. In order to determine this, 3 tests were conducted. The first test was to test the conductivity of each substance at room temperature. In this test, only graphite and aluminum conducted.
Characteristic Property- Test 3- Flame Test Materials: tongs, unknown 6, matches Procedure: at the sink, we held a small piece of towel that was soaked with the liquid fraction 6 and held it with the tongs for the lit match to light it on fire. Data: We found that the unknown is flammable after it automatically lit on fire and burned during the burn test.
To do the temperature and dissolved oxygen tests, stick the probe in the water, and it will show numbers. One will be the dissolved oxygen in ppm (parts per million) and the other will be the temperature of the water. To do the pH test, stick the pH paper in the water and compare the color it turns to the scale. To test nitrates, put clear water in a container and dirty water in another, and put powder in them. Shake them and then compare the color they turn to the scale.
Large bubbles with a short duration indicate a higher alcohol content, while smaller bubbles that disappear more slowly indicate lower alcohol content. A common folk test for the quality of moonshine was to pour a small quantity of it into a spoon and set it on fire. The theory was that a safe distillate burns with a blue flame, but a tainted distillate burns with a yellow flame. Practitioners of this simple test also held that if a radiator coil had been used as a condenser, then there would be lead in the distillate, which would give a reddish flame.
Introduction A candle is a lightsource now mostly used for decorative and ceremonial purposes. It consists of wax, tallow and similar slow burning material. Candles are usually made in a cylindrical form but can be made with fanciful designs, enclosing and saturating a fibrous wick (Britannica School, Candle). A candle, when in use, burns when the heat from the flame liquefies the wax near the base of the wick.
Next, a 10 mL beaker is filled with 3 mL of HCl and measure 10 mL of ionized water into a 140 mL beaker. Carefully turn on laboratory burner and start cleaning the Nichrome wire by dipping it into concentrated HCl acid. Hold the Nichrome wire on top of the flame and repeat the step until the wire doesn 't show any color. When the wire is clean, dip the wire again with some of the acid and dip it into the solution with the unknown compound in it. Place the wire back into the flame again and observe the color of the flame.
In order for a substance to be a conductor of electricity it is necessary that the substance consist of electrons that are able to move around in the substance. Read the entire laboratory activity. Form a hypothesis as to whether distilled water is a conductor of electricity. Based of this laboratory activity I believe that if distilled water is tested and experimented, then it will show not be a conductor of electricity.
This was an indicator to see if a reaction had occurred, and would change color if one had. The two test tubes were then placed in the water, and sat for around 5 to 6 minutes until a reaction had started to occur. Both the distilled water and the Alkaline
Place your conductance sensor into the distilled water. Make sure the straw is completely covered in the distilled water. Read the current displayed on the multimeter and remove the conductance sensor immediately.
Introduction: When we breathe, we extract oxygen from the air, and use that oxygen for metabolism, which is how we convert the food we eat into useable energy to do the things that we do. One of the by-products of metabolism is carbon dioxide; whenever we exhale, we are getting rid of the carbon dioxide that our bodies produce. The main purpose of breathing, therefore, is to provide our bodies with oxygen, and rid our bodies of carbon dioxide. We humans are terrestrial (land-dwelling) mammals, and as such, our lungs are designed to breathe gas. Therefore, the first problem we must overcome to explore the underwater realm is a means to provide breathing gas.
Second, we’ll need to test the conductivity. By this, we connected the sample to the wires that were attached to the lightbulb and a battery. If the light bulb light up when connected to the sample, then that proves that the sample is conductive. If the light bulb doesn't light up, then the sample is not conductive. Third, we needed to figure out if the sample is soluble or not.
Explanation of the Reaction A combustion reaction is a chemical change in which a compound reacts with oxygen often producing energy in the form of heat and light.1 Candles make light by making heat, and all of the light a candle makes comes from the chemical reaction combustion. 2 Once you light a candle, the wax near the wix melts from the heat of the flame. The liquid wax is then drawn up the wick by capillary action.
I. Purpose: To measure conductivity of solutions. To classify substances as conductors, partial conductors, or nonconductors. To relate conductivity to bond type. II. Materials:
We investigated phase behaviors of the mixtures of pyrene and model polymers with or without aromatic side groups. The pyrene and polymer mixtures showed two phase behaviors due to crystallization of pyrene. The melting points of pyrene crystals, which define the phase boundary of the mixtures, were conveniently identified using the DSC technique. Among the polymers employed in this study, poly(2-vinylpyridine) is most favorably miscible with pyrene and 1,4-polyisoprene is least favorable. Using the simple Flory-Huggins theory, we extracted the effective interaction parameters between pyrene and model polymers.
In my seventh grade science course, we were given basic information about anions and cations, we learned how to use models to create chemical formulas, and we conducted several experiments. The only one of these experiments that I can remember in detail is when we were stationed at bunsen burners, given chemicals, and were told to find out what colors the chemicals burnt. The experiments we did were often more to keep us entertained and we were never truly explained all of the science behind