Clean the nichrome wire by dipping it into the acid and heating the loop to get rid of any excess chemicals. Dip the wire into one of the sample solutions and place into the hottest part of the flame. Repeat the dip into the salt solution if necessary to see the flame test colour. Write the colour of each metal salt when it is put into the flame into a results table. Repeat this procedure with the other known solutions to record the
The watch glass was removed with the beaker tongs. Using a rubber bulb and a stirring rod to stir the solution continuously, 15.00mL of .25M BaCl2 solution was added to the solution in the beaker. The watch glass is replaced and the solution is keep hot but not boiling for 15 minutes. The precipitate was allowed to settle. When the liquid above the precipitate was clear, the solution was tested for completeness of precipitation when a few drops of BaCl2 solution were added from a pipette.
How the length affects the resistance of a wire Introduction Aim In this piece of coursework I want to find out how the length affects the resistance of a wire. What is electricity? Electricity is a form of energy. The flow of electrons is the flow of electricity. Every single thing is made up from atoms.
Page 7 Flame Test …………………….………………………………………………………...…………………….. Page 7 - 8 Identification of the two unknown compounds ………………………………………………………………... Page 8 Testing for ions (chloride, carbonate and sulphate ions) ……………………………………………………… Page 9-11 Equipment ____________________________________________________________ __________ Equipment used.................................................................................................................................................. Page 11 Labelled diagram of the Bunsen burner flame ………………………………………………………………..... Page 11
This colour can be used to determine which ion is being burnt as each ion emits a certain specific combination of wavelengths which correspond to specific colours. Variables: Independent Variable: Metal Salt Dependent Variable: Colour of the flame Controlled Variable: Quantity of the metal salt taken. Apparatus: * Safety goggles * Latex gloves * Nichrome wire * Bunsen burner * Hydrochloric acid * Wash bottle(with distilled water) * some metal salts > sodium chloride > sodium carbonate > sodium sulphate > lithium chloride > potassium chloride > potassium sulphate > strontium chloride > calcium sulphate > calcium carbonate > calcium chloride > copper carbonate > copper chloride * Spectroscope * Cobalt glass Safety Precautions:- * Safety goggles and latex gloves must be worn. * Hydrochloric acid is corrosive and can cause severe injury. If you spill acid on yourself, immediately flush the affected area with water for 2-3 minutes and notify the teacher.
The standard and test sample’s frequency can be differentiated by the detectors. [2] 0.1 to 10 ml of test samples is put into a narrow test tube and the test tube is inserted into the middle of the magnet pneumatically. Automatic sample changers are available to eliminate the inconvenience of analysis of only one sample at a time.
These impurities include vanadium, arsenic, zirconium, iron, silicon, and magnesium. Therefore, impure titanium tetrachloride is then cleaned of all these impurities for the purpose of gaining a pure titanium tetrachloride. The cleaning process is initiated by allowing the former mixture to settle, where the undissolved particles are removed as dirt or mud. Afterwards, the liquid that contains several chlorides is passed through a distillation column and is chemically treated with hydrogen sulfide or mineral oil to eliminate vanadium oxychloride, which is a chloride that boils at the same temperature as titanium tetrachloride. Finally, it is redistilled again to further purify the titanium tetrachloride produced.
WHY? To examine what kind of environment would be needed to allow life to begin. THE GASES The gases they used were methane (CH4), ammonia (NH3), hydrogen (H2), and water (H2O). How did they simulate lightning? Sparks were fired between the electrodes to simulate lightning through the atmosphere and water vapor.
Investigate How Changing the Concentration of a Sodium Chloride Solution Affects the Rate of Electrolysis Aim: During my investigation I will be investigating how changing the concentration of sodium chloride (NaCl) will affect the rate of electrolysis. Electrolysis: “Electrolysis is the process by which ionic substances are broken down into simpler substances using electricity. During electrolysis, metals and gases may form at the electrodes.” (http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/ions/electrolysisrev1.shtml) There are always two electrodes during electrolysis; the anode, which has a positive charge, and the cathode, which has a negative charge). Generally, the electrodes are made of carbon as it is the only non-metal that is a conductor. The positively charged ions are attracted to the negative cathode where they gain electrons to form atoms that have no overall charge.
Look in the water bath on your table for a flask labeled DMA. This flask contains Davis Minimal Agar that has been autoclaved to make it sterile, and is being kept at 47 C to keep it liquefied. 3. Think about these important points in pouring a petri plate before doing it: a) You must work quickly, because once the container of minimal agar is removed from the bath, it will start to harden within 2-3 minutes. b) When pouring agar into the petri dish, pour just enough to fill the dish about half way.