Year 9 MYP Science: An Experiment On Metals

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.

Something that was interesting to find out though, in the description of the reagent color test they show the lighter color on top and the darker one on the bottom. But just as the test that was conducted showed and what Officer had said was that the darker color is always on the top and the lighter on

Some compounds have very distinctive colors when burned, such as Potassium, which is a white/purple, and sodium, which is a deep red hue. The first step for a flame test is to gather the needed materials. These include beakers, distilled water, the unknown substance, a Bunsen burner, matches, a nichrome wire, tubing to connect the gas line to the Bunsen burner, goggles, and known compounds to compare with. The first step is to make aqueous solutions of all the substances to be tested. This is done by adding .5

Exercise 1 1. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Using your results from Data Table 1 as a guide, how would you test this material for the presence of sodium bicarbonate? B BoldI ItalicsU Underline Bulleted list Numbered list Superscript Subscript33 Words

At the surface of the water was a thin layer of orange material 5 Signs of Oxidation at the top and bottom of the test tube The top and the bottom of the nail turned orange At the surface of the water was a thin layer of orange material 7 Signs of Oxidation at the top and bottom of the test tube The nail darkened and left some black residue on nail 9 Clear & No Signs of

Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda Types of qualitative tests There are two types of qualitative tests which are used for identification cation and anion Preliminary Tests : On treating the solid carbonate, CO2 is given off in the cold with brisk effervescence. II.

These color changes indicate a chemical change, which show that a reaction had occurred. In the first step when o-vanillin and p-toludine, imine was formed. The color change from green to orange suggests that imine appears as orange colored. In the second step, the addition of sodium borohydride reduced the imine into another derivative, which was yellowish lime color. The solution turned clear when acids and anhydrides was added, which indicated the precipitate were dissolved.

The color of the flame help in determining the compound. Reasoning: The Flames test lab shows how different compounds react to heat and energy. After testing all compounds we were able to find out the unknown compounds.

We are going to do 4 replicates for different classes. Materials Procedure • Pan (Glass) • Stand • Four Candles • Lid (Glass) • Liquid (Water) • Food dye (Red) • Lighter 1.

Chemical compounds that are available to determine are CaCO3, CaCl2, Ca(NO3)2, mgCl2, MgSO4, KCl, HCl, HC2H3O2, KNO3, K2SO4, NaC2H3O2, Na2CO3, NaCl, Na2SO4, HNO3, H2SO4, HNO3, H2SO4, NH4Cl, (NH4)2SO4, K2CO3, 0.1 M AgNO3, 0.2 M BaCl, Mg(s), NaOH, and KOH. To start this experiment, start with the flame test by gathering a Bunsen burner and a Nichrome wire. Connect the Bunsen burner with a rubber tube to a laboratory gas. To prepare solutions for the flame test, weigh out 0.205 gram of Unknown Compound using an analytical balance and mixed it into a 140 mL beaker filled with 20 mL ionized water. Ensure that solid is completely dissolved using a stirring rod.

For steps #2, 3 and 4, identify the type of chemical property that was observed. For steps #2, 3 and 4, the chemical property which was observed through the experiment is reactivity with a mixture. It was a mixture being featured because while copper sulphate is a pure substance, when it was added to the water, the copper sulphate became a mixture. I can justify which the property observed was reactivity with a mixture because all the steps consisted of reacting materials residing from different states of matter into the solution. The various reactions ranged from higher temperatures, to gas bubbles, to even colour

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

Washing the ester with sodium carbonate solution Effervescence -bubbles of gas produced -a ‘pop’ sound could be heard when the separating funnel is closed and opened again. The ester layer is immiscible with the sodium carbonate solution Adding anhydrous calcium chloride into the ester solution Heat would be produced as the surface of the conical flask feels warm. Anhydrous calcium chloride crystals would clump up after swirling.

In the first four reactions of the ethyne gas, the result of lighting the gases was a mixture of incomplete and complete combustion for all four tests. Due to the fact that the ethyne gas was placed in an enclosed space, which is the test tube, it does not have as readily of an access to the oxygen present in the room than an open flame. The result was incomplete

The wax melted first, followed by the salt, and lastly the sugar. The salt not only burned before the sugar, but developed a brown color throughout most of the substance at a faster pace. In the water solubility test, the salt dissolved in the water, as soon as it was properly mixed and the sugar dissolved in the water as well, but was stirred for a longer period of time until it was completely dissolved. The wax did not dissolve in the water, however bits of the substance broke off from the main piece. With this information, the final results included: wax as a nonpolar covalent compound, since the substance melted first and was not soluble in water; salt as a polar covalent compound, since the substance was soluble in water and the second to melt; and sugar as an ionic compound because the substance melted last and was soluble in