Dissolve solid KA1 in distilled water and filter. Use separate portions of the filtrate for the following tests. (i) Add aqueous sodium hydroxide‚ then in excess. (ii) Add aqueous ammonia‚ then in excess followed by aqueous ammonium chloride. (iii) Add aqueous iron (III) chloride‚ then warm. (iv) Add aqueous silver nitrate‚ followed by dilute nitric acid. (v) Add aqueous disodium hydrogen phosphate. (vi) Add aqueous potassium chromate (VI) followed by dilute hydrochloric acid. Observation Solutions smells
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Nerve Impulse • In this experiment‚ we will be investigating what stimulates action potential on the nerve being tested on the oscillator. The factors that helped determine action potential are voltage‚ single stimulus‚ Hydrochloric acid‚ sodium chloride‚ the glass rod‚ and heat. II. Activity 8: Nerve Conduction Velocity • In this activity‚ we will be investigating action potential like in activities 1-4‚ and the nerve conduction velocity. We will test an earthworm nerve‚ frog nerve‚ and two
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Chemical Reactions I. Purpose – The purpose of this lab was to observe different type of chemical reactions to write and balance chemical equations. II. Hypothesis: If you mix two chemicals together‚ then they will change color and/or bubble/fix. III. Procedure - Workstation 1: 1. Light the Bunsen Burner 2. Add 5 – 8 mL of HCL to a test tube that’s in the test tube rack 3. Drop a 2 – cm piece of Mg ribbon into the test tube 4. Record Observations 5. Clean Workstation
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Purpose: There are four halide salts used in this experiment that are found in the human body. Sodium fluoride is poisonous‚ but has been traced to be beneficial to humans in the prevention of tooth decay. Sodium chloride is added to many of our foods to increase flavor. Sodium chloride is important for many life processes‚ but too much intake is linked to high blood pressure. Sodium bromide is distributed throughout body tissues. Sodium iodine controls cell growth. The principal oxidation number
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reaction between the HCl molecules and water that results in formation of ions. Materials and Method A 100mL of beaker were filled up to aboput 2/3 full with the following solution: Tap Water 95 % C2H5OH 1M CH3COOH Distilled water Sodium chloride crystals Sucrose crystals 12M HCL 1M NaCl 5% sucrose solution 1M HCL Conc. H2SO4 1M NH4OH 1M NaOH 1M H2So4 1M CH3COOH 1M NH4Cl 17M CH3COOH 1M NH¬4OH + CH3COOH The electrodes of
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Demo write up: #1 The plastic tablet that gets placed into the water causes the water to spin like a tornado. Then when dry ice is added the water starts to spin and create smoke‚ the color of the water goes from dark green to light green. There is probably a chemical in the dry ice that is reacting with the universal indicator which is causing the substance to change colors. Hydrochloric acid changes the color of the mixture and makes it green to yellow but when you add more hydrochloric acid
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between them. II. Safety- In this lab the needed safety materials required are safety goggles and apron. Also its suggested to wash hands after dealing with any of the chemicals. some chemicals with safety hazards we will be working with are Sodium chloride with is slightly toxic if ingested. Sodium Bromide which is slightly toxic if inhaled or ingested may cause serious eye damage if in contact. Sodium Iodide may cause serious eye damage‚ corrosion or irritation causes skin irritation. Silver Nitrate
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N12/4/CHEMI/SPM/ENG/TZ0/XX 88126104 CHEMISTRY standard level Paper 1 Friday 9 November 2012 (afternoon) 45 minutes INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question‚ choose the answer you consider to be the best and indicate your choice on the answer sheet provided. • The periodic table is provided for reference on page 2 of this examination paper. • The maximum mark for this examination
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carbonate is domestically well known for its everyday use as a water softener. It is also used to remove grease‚ oil and wine stains. It can be extracted from the ashes of many plants. It is synthetically produced in large quantities from salt (sodium chloride) and limestone in a process known as the Solvay process. Titration is also known as titrimetry. It is the process‚ operation‚ or method of determining the concentration of a substance in a solution by adding a standard reagent of known concentration
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and would take a long time to dry. A drying procedure is therefore necessary to remove all traces of water before the solvent is evaporated. This procedure consists of two steps: (1) thoroughly mixing the solution with saturated aqueous sodium chloride (saturated salt solution) and discarding the aqueous layer (this is a preliminary drying step that removes most of the water) and (2)‚ adding a solid inorganic drying agent (this strongly binds to the remaining traces of water dissolved in the
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