Clamp and clamp stand Essay Example for Free

secure and clamp groundwork searchIn this project I am going to investigate come ins of response of an indigestion pill when added to hydrochloric acid. The variable I am going to use give be the temperature of the acid. (All background knowledge utilise in this project was taken from previous experience nones and experiments from work done in year nine) What be gaits of chemical chemical reaction? The rate of a reaction is the speed at which a reactant is turned into the product. chemical substance reactions atomic number 50 take place at very different rates (eg. explosions, rock formations).A rate is mensurable as A change in something (eg.loss of mass/mass of gas given off) dual-lane by The beat it takes to change/disappear Rates of reactions can be mea trustworthyd in 2 different ways How fast reactants disappear How fast products appear Many factors affect rates of reaction Surface area The greater the surface area of a solid, the greater the area of the pa rticles that is exposed and potential to collide with early(a) particles, meaning to a greater extent(prenominal) successful strikes can take place per second. Therefore reaction between acid and a finely powdered salt will take place high-speed than a reaction between the same acid and a lump of salt.Concentration of disclosecomes The rate of a reaction appends as the concentration of the solution increases. This is because thither are more solute particles to collide with a intractable muckle of solvent particles. Therefore more successful collisions take place. The rate of a reaction is resembling a shot proportional to its concentration (i. e. as concentration doubles, rate doubles. ) (This is assuming that any reactions taking place are not exothermic and that no other variables are changed) Temperature The rate of reaction increases as the temperature increases.This is because at a higher temperature the particles go around faster (due to heat cleverness being con verted into kinetic energy) and fetch more chance of colliding with separately other. Also, there is a greater chance of effectual collisions. However, unlike concentration, this is not proportional. As the temperature begins to increase, the rate increases slowly, but as it gets higher the rate increases faster, creating a curved graph. Catalysts Catalysts are substances which increase the rates of chemical reactions but are not used up or altered in any way altered themselves.They provide an alternative method of collision requiring less energy. (eg. enzymes in the physical structure are natural catalysts). Pressure of Gases When the pressure of a gas is increased, the molecules have less space to move around in. This increase in concentration makes them collide more often. What is Collision Theory? Collision theory states that the more successful collisions per second there are, the higher the rate of reaction. In order for a collision to be successful (or effective) there need to be enough energy, speed and strength to break the bonds in the colliding molecules.Collisions between molecules are stronger at higher temperatures. In an ineffective reaction, the molecules just rebound off severally other. My Experiment I am going to investigate the relationship between rates of reaction and temperature. I chose temperature because it is easy to keep the concentration constant and from previous experiments I have not methd the graph has more points of interest than that of concentration (see pageboy 2). I could do this in two different ways vizor how fast reactants disappearThis can be measured all by weighing a solution before and after to check mass change, or by sight (for example seeing how long it takes before a cross under a cloudy solution is no longer visible. ) The latter(prenominal) is inaccurate and not easily measurable as tender error plays too large a part. However, I could weigh the mixture before and afterwards Measure how fast produ cts appear This can be measured in many different ways, depending on the state of the product. If it is a gas, the gas can be stash awayed and measured in a gas syringe.First, I need to look at the equations for the reactions of the participating ingredients in the tablets with the acid. These active ingredients are Magnesium carbonate Calcium Carbonate Sodium Hydrogen Carbonate General Equation These equations show that the final products are a metal salt, water and carbon dioxide.I can either measure the mass before and after adding the tablet to the hydrochloric acid or collect the gas given off. I chose to measure the gas (after my preliminary experiments see page 7) because I cipher this method can be modified to produce good results. Also in the preliminary experiments I worked out a good vividness of gas to collect (see page 7). It does rely on human judgement (in starting and stopping the stopclock) but all other methods involving timing do also.Within this, there are t wo different ways that the gas given off can be measured I can measure how long it takes for the reaction to give off a fixed volume of gas. I can see how much gas is given off in a trustworthy time. I am going to use the first method, as I think that the stopclock will be more accurate than the gas syringe as I only want to measure the time to the nighest second. Also the gas syringe only has markings every for every 5cmi of gas given off, and whence it would be easier to measure to a marking on the syringe. Prediction and Hypothesis.I predict that as the temperature increases, the rate of reaction will increase also. This is because at a higher temperature there is more heat energy to be converted into kinetic energy, making the particles move around faster. Faster moving particles have more chance of colliding with each other and the greater quantity of heat and energy means more effective collisions are created. As I wrote earlier (see page 2), a graph of temperature/rate sho uld look like this a. Because the two wouldnt mix at 0i C or less I have to start at a temperature above that. Therefore the graph wont go through the origin.b. To begin with the rate of reaction rises slowly. c. It increases faster as the temperature increases, giving a line which gets rapidly steeper. Plan NB. Although this is the final plan for the echt experiments, a lot of the volumes and other measurements werent worked out until the preliminary experiments were done (see pages 6, 7 and 8). In the preliminary experiment section I have specified the areas that I was investigating. Get out equipment as specified. Measure out 50cmi of hydrochloric acid (concentration 4mol/dmi ) into a conelike flask utilise a burette.Measure the temperature of the solution and adjust it until it is the need temperature (by adding more cold/hot water into the beaker its in). Make sure the gas syringe is back to 0. tally two unit tablets to the solution, put the bung in and start the stopclock (or get someone else to start the stopclock). reel the solution gently to aid the reaction. When 50cm i of gas has been collected stop the stopclock Remove the bung from the conical flask to avoid too much gas being collected. Note the temperature and the time taken. Repeat the experiment, and then do the same for six other temperatures.To realise that this is a fair test, there should only be one variable, temperature. Therefore the temperature of the acid is the only thing that I should change. I should try to keep the volume of acid the same (by using a burette), keep the concentration of acid the same, only use whole tablets (to keep the surface area the same) and try to swirl the acid in the same way each time. Range and Readings Before the preliminary experiments I had decided to take six readings, all with repeats. These readings would have been either five or 10i C apart and would have ranged from approximately .During the preliminary experiments I investigated this furt her (see page 8), and revised this original method. However, I did realise beforehand that there were several different ways I could get temperatures of 50i C. I could use a Bunsen burner to heat the acid or I could stand the acid in a beaker full of boiling or hot water. The second method seemed the go around because it was easily controllable, the temperature wouldnt rise too quickly, and you could also stand the acid in ice to cool it to 10i C. I didnt change this part of the method, as it seemed to work effectively. Equipment Use Conical flask.This will hold the hydrochloric acid and the tablets. It needs to have a bung in it and a tube with a bend in it which can be subsumeed to the gas syringe, to stop any gas escaping during the reaction. As I am using two whole tablets, I dont need to have one with a particularly wide neck. Clamp and clamp stand These will hold the gas syringe at the correct height to connect to the conical flask. Gas syringe This will measure the volume o f gas given off during the reaction, or the length of time it takes to give off a given volume of gas (50cmi ). It should measure to the hot cmi.Burette This will be used to measure out 50cmiof hydrochloric acid accurately (it measures to half a cmi , and therefore is more accurate than for example a measuring cylinder. ) Thermometer This will be used to ensure the temperature is kept correct and constant leading up to the experiment. It measures to half a degree. Tub I will stand the conical flask in a tub full of hot water/ice which will bring the acid to the temperature needed. Stopclock This will time how long it takes to collect 50cmi of gas. This should be accurate to the nearest second. Diagram of Equipment Safety Certain safety precautions must be taken when using acids and other potentially harmful substancesGoggles must be worn to protect eyes. This is especially important as I am heating acid (although gently) and hot acid may spit before or during the reaction. If there are spills with corrosive acids they must be cleaned up immediately and thoroughly to prevent accidents (for example slithering on acid), and any skin that comes into contact with the acid must be thoroughly washed. Hands should be washed anyway after using acid. After my experiment I must make sure that everything is cleared away effectively. I must not leave any acid or other substances out to prevent it becoming a safety hazard.