## Saturday, February 8, 2020

### Which is bigger Feel the Fear or The Giant Essay - 2

Which is bigger Feel the Fear or The Giant - Essay Example The accurate and appropriate calculations including all the steps of arriving at the right answers are given in the report analysis section (Berry et.al 1995 pp24). The conclusion part will discuss and comment on the results obtained in the entire investigation. Mathematical modelling is the process of using the concepts of mathematics, as well as its language as a system of description (Berry et.al 1995 pp24). A model of mathematics is the idea of representing the relationship between numerous variables that are significant to a given question or problem. The model is used to solving and provide accurate answers to the given problems or situation. The process uses mathematics to solve situations and problems (Berry et.al 1995 pp24). The model guides the solver to find the answers to the questions asked. The modelling is used for a number of aspects including a description of phenomena in the real world, investigation of the observed world and its issues and questions, idea test and predict the real world among others. Questions one and two deals with the calculations of the maximum and the minimum height. The two questions are essential to the report since they determine the achievement of one of the most important research questions. The other questions, i.e. three and four all lie under the same topic of maximization and minimization. Question three finds the area and question four determines the length or the dimensions of the box. To conclude, the investigation gave the results and the data as expected. The mathematical is relevant to the calculations and analysis section of the report. The process of analysis was used in the report to find accurate answers to the mathematical problems in the report. Using the main ideas in the modelling process such as formulation and analyzing among others. The answers found are accurate and gives a general answer to the research questions. They play the analysis part in the report. The answers include the

## Tuesday, January 21, 2020

### The higher the temperature of the sodium thiosulphate the faster the :: GCSE Chemistry Coursework Investigation

The higher the temperature of the sodium thiosulphate the faster the reaction of the two liquids. Information. According to the kinetic theory all matter is made up of tiny, invisible particles that move all the time. When the temperature is increased around or on these particles, the faster they move. Heavier particles move more slowly than light ones at a given temperature. This theory defines the differences between solids liquids and gasses; in a gas the particles move freely and at random in all the space available, in solids particles only vibrate around fixed positions and in liquids the particles have some freedom and can move around each other. Using the kinetic theory we can explain changes in the state of substances as they are heated and cooled. We can also explain dissolving and diffusion using the kinetic theory. The kinetic theory says that gases diffuse to fill up the space around them. This explains how the smell of cooking can be smelt all over the house after a short period of time. It's not only gases that diffuse, diffusion occurs in liquids too. Diffusion involves the movement of particles from a region of higher concentration towards a region of lower concentration. The kinetic theory can be used to explain the factors affecting the rates of reaction, this is an extension to the kinetic theory called the collision theory. The collision theory says that Chemical reactions occur when particles of the reactants collide. They must collide with a certain minimum energy, called the activation energy. To summarise, the requirements for an effective collision (for a chemical reaction to occur): The reactants must collide with each other, The molecules must have sufficient energy to initiate the reaction (called activation energy). Planning This experiment is to discover what affects rate of reaction. In this experiment there are two solutions used, Sodium Thiosulphate and Hydrochloric Acid. (Sodium Thiosulphate + Hydrochloric Acid) (Na2S2O3 (aq) + 2HCl (aq) In this reaction, a fine precipitate of sulphur slowly forms, to measure the rate of reaction, we time how long it takes to form the precipitate. Five of the most common ways to influence the rate of reaction can be explained using collision theory. They are: changing the nature of the reactants, changing the concentration of one or more of the reactants, changing the temperature at which a reaction is performed, changing the surface area of a solid reactant, adding a catalyst. I have chosen to study how the rate of reaction changes when the temperature of the sodium thiosulphate is varied. Before we could conduct the experiment there was some preliminary work to be done. This was to find out what amount of each liquid would be