Science Essays

The aim of my experiment will be to find out which alcohols have a higher enthalpy change of combustion. The comparison of the enthalpy changes of these fuels will then determine the alcohol efficiency and effectiveness. I will experiment on the first 5 consecutive primary alcohols. These are; methanol, ethanol, …

This film is a typical example of sci-fi, we can tell this by the use of visual codes and convention. The film is set in space and Spaceships are in conflict with each other, there are lazers being fired, robots are running around and there is a clear divide between …

This middle market tabloid article is produced to present an opinionated and polemic point of view of the renowned Miss World Competition. Vanessa Feltz produces a written mode text which expresses the thoughts and feeling in regards to the competition. It aims to capture the attention from the readership of …

1. MUCH OF THE WORK OF CHEMISTS INVOLVES MONITORING THE REACTANTS AND PRODUCTS OF REACTIONS AND MANAGING REACTION CONDITIONS * outline the role of a chemist employed in a named industry or enterprise, identifying the branch of chemistry undertaken by the chemist and explaining a chemical principle that the chemist …

Analysis Method one. In order to find out the ratio of H2O to FeSO4, the mass of water needs to be calculated, which is done by weighing the iron sulphate before and after the heating. This will tell us the weight that was lost and thus the weight of the …

Aim: To determine the percentage purity of a sample of sodium carbonate. Equation: Na2CO3 + 2HCl –> 2NaCl + H20 + CO2 Sodium Hydrochloric Sodium Water Carbon Carbonate Acid Chloride Dioxide Chemicals: * 4.00 g dm-3 of impure Sodium Carbonate in solution * 1.00 mol dm-3 Hydrochloric acid Apparatus: * …

Reacting Lithium with water Mass of Lithium reacted 0.08g Volume of Hydrogen collected 131cm3 Titration Rough 1 2 Volume of LiOH 25cm3 25cm3 25cm3 Volume of HCl required 25.6cm3 25.4cm3 25.4cm3 Analysis 1. 2Li(s) + 2H20(l) 2LiOH(aq) + H2(g) a) Finding the number of moles of Hydrogen: To find the …

Purpose: The purpose of this lab was to determine the type of bonding in some unknown substances based on their physical properties. Table of Properties: Properties Ionic Molecular Electrical Conductivity of the compound in aqueous solution Conduct Don’t Conduct Melting and Boiling points High Low Electrical Conductivity of the compound …

Skill P – Planning * The aim of this practical experiment is to determine the enthalpy change for this reaction by an indirect method based on Hess’s Law. Both Calcium Oxide and Calcium Carbonate react readily with 2 mol dm Hydrochloric Acid solutions. The temperature changes during these reactions can …

Planning Aim and background reading The aim of this experiment is to show how the rate of reaction of the halogenoalkanes changes in respect to the C-X bond, where the C is the carbon and the X is the halogen. This will occur through a nucleophilic attack. The halogenoalkanes undergo …