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Finding thr Percentage Composition of Magnesium Oxide

Introduction According to Encyclopedia Britannica, the law of definite proportions is a “statement that every chemical compound contains fixed and constant proportions (by weight) of its constituent elements.” Using experimental data in this investigation, it will determine the percentage composition of magnesium oxide. Chemists believe that the energy released by the synthesis combustion reaction is… View Article

Detecting starch and sugars in food

Aim: To detect the presence of starch and sugars (glucose and fructose) in different food sources. Background: We have many different foods in daily life and many of them contain nutrients like carbonhydrates which are essential to human life. Starch is a polysaccharide, a group of nutrients known as carbonhydrates. Glucose and fructose are monosaccharides,… View Article

Determining Ka by the half-titration of a weak acid

To get the Ka of acetic acid, HC2H3O2 I will react it with sodium hydroxide. The point when our reaction is half-titrated can be used to determine the pKa. As I have added half as many moles of acetic , as NaOH, Thus, OH- will have reacted with only half of the acetic acid leaving… View Article

Experimental Molar Enthalpy of Neutralization for Sodium Hydroxide Solution

1. For information regarding the problem, prediction, materials and procedure, please see attached Measurements Table for Molar Enthalpy of Neutralization for Sodium Hydroxide Solution Substance Instrument Used Measurement Sodium hydroxide 100mL graduated cylinder (±0.2mL) 50.0mL Sulfuric acid 100mL graduated cylinder (±0.2mL) 30.0mL Temperature of sodium hydroxide solution Thermometer (±0.2ËC) 26.0ËC Temperature of the sulfuric acid… View Article

Investigation of Enthalpy Change When Mg is added to HCl

Research Question: How is the enthalpy change of the reaction between Mg and HCl affected when different amounts of Mg are added to a constant amount of HCl? Variables: Independent: Mg Dependent: Temperature Control: HCl Controlling Variables I will use three different masses of Mg: 0.02g ± 0.001g, 0.03g ± 0.001g, 0.04g ± 0.001g I… View Article

Chemistry Investigation to find the Empirical Formula of Magnesium Oxide

During the experiment the crucible used was slightly damaged however did not continue to break or cause any inconvenience to the investigation. For approximately ten minutes, no reaction was visible. The substance contained no odour. After approximately fifteen minutes the piece of magnesium commenced to burn with an overall duration of twenty minutes. When burnt,… View Article

Chem lab report shampoo experiment

Investigate the Chemical Properties different shampoo brands and determine the best brand of shampoo manufacturers. Take your 1% shampoo solution in a beaker and using the pH meter find the pH value of the shampoo. Information: Most shampoos are neutral or slightly acidic. Acidic solutions cause the cuticle of the hair to shrink and lay… View Article

Exploring How State of Matter Affects the Rate of Diffusion

Introduction Diffusion is the random process by which particles distribute themselves within a container or medium. There are two factors that distinguish how substances move passively through membranes. The first factor is hydrophobic , a nonpolar molecule that can dissolve in a lipid bilayer and freely move through the membrane. However a hydrophillic molecule consisting… View Article

Chemistry IA: Electrolysis of Metal Sulphate solutions

Introduction Electrolysis is the chemical decomposition of a compound by applying an electric current through a solution containing ions. Electrolytes are required to conduct electricity. They must be dissolved in water or in molten state for the electrolytes to conduct because then, the ions are free to move allowing the solution to be electrolyzed.[1] In… View Article

Analysis of Hydrated copper sulphate

Aim – To determine the molecular formula of hydrated copper sulfate. Requirements – Hydrous copper sulfate Electronic balance Evaporating dish Glass rod Tripod stand Bunsen burner Crucible Procedure – First I weighed 3g of hydrous copper sulfate on electronic balance and began heating it in an evaporating dish on top of a Bunsen burner. After… View Article

Analysis of the Standard Enthalpy of Combustion for Alcohols

Aim: To investigate the standard enthalpy change of combustion for 5 consecutive alcohols in the alcohol homologous series, methanol, ethanol, propan-1-ol, butan-1-ol and pentan-1-ol, by using a calorimetric method to calculate the heat gained by the 100cm3 water in the experiment, and thus the heat lost by the alcohol lamp at standard temperature and pressure… View Article

Neutralization Titration using a Strong Acid and Weak Base

What mass of sodium carbonate is needed to make 250cm3 of a 0.0500 mol dm-3 solution? What is the concentration of the Hydrochloric acid of 0.108 mols? This experiment involves the making of a standard sodium carbonate solution and using the exact concentration of this solution to find the accurate concentration of an approximately 0.1mol… View Article

Investigating the Effects of Surface Area on the Rate of Reaction

Aim: To study the effects of changing the surface area on the rate of a chemical reaction Hypothesis: This hypothesis is based on the Collision Theory, where in order to react, the two particles involved must: 1. Collide with each other 2. The collision must be energetic enough to overcome the activation energy of the… View Article