This website uses cookies to ensure you have the best experience. Learn more

Rates If Reaction Gcse Cousrework Essay

3160 words - 13 pages

IntroductionI am investigating what affects the rate at which to reactants react and make a product. The two reactants in particular are marble (CaCO3) and hydrochloric acid (2HCl); the products that they produce are carbon dioxide (CO2), water (H20) and a calcium chloride (CaCl2). The product that will be measured (to show that the reaction has taken place) will be carbon dioxide, as a gas it can easily be bubbled off and measured in burette. The test will be time related e.g. seeing how long the mixture took to fill a 50 ml burette with carbon dioxide.Values and VariablesThe definition of a variable is anything that changes or can be changed. The definition of a value is how much something is worth or what groups it can be put into. There are three types of values (which in turn can be split into 3 categories of variation depending what part in the experiment they play):"h Continuous Values- This variable is one that can go on forever and be potentially any number. Examples of this are size, time, volume and mass. They are affected by only by the degree of accuracy you are going to. For instance they are often (for practicality) rounded to a certain point."h Discrete values- These are similar to continuous but they tend to increase in steps and could in some cases seem to go on continuously but not in reality doesn't. Examples of this are shoe size or trouser waist size."h Categorical values- This type of variable isn't defined by a value or number, instead it is by the presence of a characteristic that they are defined. They are for example shape, hair colour, make of car etc.The 3 categories of variable are defined by what part in the experiment they play and in what manner I can control them. These 3 types are as follows:1. Independent Variables- These I have direct control over and are determined by pre set variables. An example of this would be how much acid I put in or the amount of carbon dioxide that is required to be produced before the test is completed.2. Dependant Variables- These are the type of variables that I am trying to find out. (Or in simple terms ¡Vmy results)3. Control Variables- These are variables that have to be kept the same throughout the test. Below are a selection of variables I choose If I were to choose one the rest would become control variables and to make it a fair test I would have to keep them the same.The next choice is which Variable I will choose to investigate. The list is belowThese things might affect the rate of the reaction1. Amounts of the reactants.2. Stirring or shaking the reactants.3. Adding a catalyst to the mixture.4. The temperature at which the solution is.5. The concentration or molarity of the reactants.6. The surface area of the surface of the marble.My VariableI have chosen to study how the concentration of one of the reactants affects the rate of the reaction. I have chosen this because along with altering the amount of reactants it is the only practical of accurately changing the...

Find Another Essay On Rates if Reaction GCSE Cousrework

Stop Saving Trees Essay

1572 words - 6 pages concentration reactants, larger surface area etc. (Factors Affecting Reaction Rates, 2014). Rate cannot be directly measured, so instead measuring the reactant or volume of gaseous product as the reaction progresses.In this investigation, hydrochloric acid and sodium carbonate were used. Hydrochloric acid is a colourless and odourless solution of hydrogen chloride and water (EPA, 2014). Similar to hydrochloric acid, acetic acid is an organic compound

The Effect of War on American Civil Rights

2437 words - 10 pages increased education rates and, importantly, greater voting registration among the black populace . Thus, by creating more opportunities for African-Americans, the defence build-up that accompanied both World War One and World War Two bequeathed to the black demographic greater political force - a crucial factor without which the civil rights movement could not have been successful. Furthermore, Foley argues that their economic gains furthered

Chemistry Coursework

2741 words - 11 pages is explained in our textbook Longmans GCSE chemistry:"If you increase the concentration of the reactants, the reaction becomes faster. Increasing the concentration increases the chances of particles hitting each other"PredictionAs the concentration increases the rate of reaction increases because of the scientific knowledge shown above.Safety· Lab coats are to be warn as spillages may occur· Safety glasses must be

Chemical Reactions

1045 words - 5 pages include the changes in state, such as ice melting into water, or even water evaporating into the air. If a physical change occurs, the physical properties of that substance will also change. But the chemical identity of the substance will remain the same. No matter what the chemical state water (H20) is the same compound, with each molecule composed of two atoms of hydrogen and one atom composed of oxygen. During a chemical reaction, the

Effects of Enzyme Rate by Variables of Enzyme Concentration, Substrate Concentraion, Temperature and pH

3910 words - 16 pages AbstractThis study was undertaken to determine the effects of different environments affecting the rate of reaction, PNPP (p-nitrophenyl phosphate) + H20 ? PNP (p-nitrophenol) + H3P04. This reaction is catalyzed by the enzyme phosphatase. Different environments produced different reaction rates as environmental factors affect the efficiency of phosphatase. This is because environmental factors can change the tertiary structure of phosphatase

Japan

8015 words - 32 pages qualifications. Around 1.5 million candidates from 150 countries enter Cambridge examinations each year. What makes educators around the world choose Cambridge? Recognition Cambridge IGCSE is internationally recognised by schools, universities and employers as equivalent to UK GCSE. Cambridge IGCSE is excellent preparation for AS/A Level, the Advanced International Certificate of Education (AICE), US Advanced Placement Programme and the International

The effects of change in concentration on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid

1764 words - 7 pages GCSE SCIENCE COURSEWORK (CHEMISTRY)PLANNING: Skill Area PWrite down the aim of your Investigation.To investigate the effects of change in concentration on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.Briefly describe your Preliminary Experiment and include your results. Explain how these results have helped you plan your main experiment (p8b).An increase in concentration will lead to an increase in the rate of reaction

Temperature’s Affect on Reactions

1400 words - 6 pages energies. Enzymes are catalysts that increase the rates of chemical reactions by decreasing the energy required to start a reaction. Many reactions have certain enzymes they need to help them take place. One basic example of an enzyme is lactase, an enzyme outlined by the gene LCT. Lactase is used in digestive systems to break down lactose, a sugar in dairy. When lactase is not present in a digestive system, the body is unable to digest lactose. Those

Light Intensity's Effect on Photosynthesis

5440 words - 22 pages ) · Sodium Hydrogen Carbonate (NaHCO ) · Thermometer (if necessary) · Small knife · Water Guillaume Wright 10C2 GCSE Science Coursework C/W Collecting Oxygen gas during Photosynthesis - How does light intensity 29/4/01 affect the rate of photosynthesis Diagram: [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE

Science-chemistry practical-To find out how the concentrations of the reactants affect the rate of reaction

1789 words - 7 pages increase in concentration, for example the line of best fit should go through 0, because if there is 0 g/l concentration there should logically be 0 rates. The graph showing the rate of reaction will have a positive correlation showing that the higher rate of reaction increases, as the concentration gets higher. This can be justified by relating to the collision theory. If solutions of reacting particles are made more concentrated there are more

Product Evaluation: A Hairdryer

1028 words - 4 pages Product Evaluation: A Hairdryer Introduction. I am a 4th year student in St Patrick's Grammar school Downpatrick studying technology and design for my GCSE. I must do two focused tasks, my first task is a product evaluation, for this task I will be evaluating a hairdryer manufactured by Vidal Sassoon. Justification. I picked this appliance because: Ÿ It is a commonly used household object. Ÿ I

Similar Essays

Order Of Reaction / Rate Law

684 words - 3 pages the reaction. The magnitude of the specific rate constant depends on the conditions of the reaction and is determined experimentally. The value of the specific rate constant, k, is large if the products form quickly; the value is small if the products form slowly. The order of a reaction is the power to which the concentration of a reactant must be raised to give the experimentally observed relationship between concentration and rate. In a

Should There Be A Mmr Vaccine

1769 words - 7 pages IntroductionIn this case study I am going to evaluate if the MMR vaccine should be used and whether it is safe for children to be vaccinated. Since 1988, there has been a big controversy about the safety of the MMR vaccine and its perceived link to bowel disease and autism. The MMR vaccine safeguards patients from deadly diseases such as Measles, Mumps and Rubella, reducing the risks of children transmitting the deadly disease and lowering the

Rate Of Reaction Coursework Essay

532 words - 2 pages Rates of Reaction A chemical reaction can only occur between particles when they collide (hit each other). Particles may be atoms, ions or molecules. There is a minimum amount of energy which colliding particles need in order to react with each other. If the colliding particles have less than this minimum energy then they just bounce off each other and no reaction occurs. This minimum energy is called the activation energy. The

David Thomas The Mind Of A Man

1294 words - 5 pages as Thomas' theory of female teachers being the cause of the boys lower grades. Thomas uses sarcasm as well to make his anger known. In reaction to her letter, he states "Heaven forbid that they [boys] should be given any consideration or compassion. Heaven forbid that the prejudices of the new age should be challenged. If you ever doubted that feminists have taken over from apoplectic old colonels as the great reactionaries of society, just read