Rates of Reaction - Magnesium and HCL :: GCSE Chemistry Coursework Investigation

Rate of reaction of Magnesium and HCL In order to find a good set of results for this experiment I need to decide what molars i am going to use, and also how i will make them. Once i have found which molars i would like to use i will give evidence of why i have chosen them, i will also decide which variables are important to considerm e.g The Values of Mg, Volume of acid. I also need to think about how i am going to measure the speed of the reaction in order to get a table of reliable results. Plan  · Equipment needed for experiment:  · Bowl  · Hcl  · 2 Measuring cylinders (1 big/1 small)  · Mg strips  · Flask  · Beaker  · Tube  · Stop clock  · Goggles  · Beehive shell Step One All of the above equipment must be gathered. Step Two The Beehive shell sould be placed in the centre inside the bowl, then the bowl is to be filled up with water until the beehive shell is covered.Then the big measuring cylinder is to be filled to the top with water and then turned upside down onto the beehive shell. Step Three The tube should be placed directly over the hole in the beehive shell, where the tube(which goes through the hole in the beehive shell and is connected to the flask) is placed into the cylinder. Step Four Then the flask needs to be filled with 20 cm3 Hcl acid, the acid is measured in a measuring tube and then poured in, once the flask is filled the magnesium strip is to be placed inside. In order to get the Magnesium strip as accurate as possible it is to be measured with a ruler to the size in which desired. Step 5 As soon as the magnesium strip touches the acid it starts to react, so the plastic plug should be put on to the flask quickly, then start the stopclock and record the amount of gas every 10 seconds. One person should read the results at eye level to the tube, so they can get an accurate reading, and another person should note down the times whereas one keeps there eye on the time. Things that will effect the rate of reaction  · Concentration of Hcl  · Surface area of Magnesium  · Temperature of reaction  · Catalyst  · Length of Magnesium  · Volume of Hcl The concentration can be increased or decreased to effect the rate of reaction. The higher the concentration, the more particles, therefore a higher rate of reaction. The surface area of magnesium can effect the rate of reaction. The larger the surface area, the faster the reaction will be as the

Behaviourist Theory for Atypical Behaviour

Behaviourist Theory (10 marks) First of all, behaviourists are psychologists that believe that behaviours are learnt instead of them being natural. Behaviourist theory believes that people learn to be phobic rather than are born phobic. Reason being, many people link their fear of an object or situation to something bad they have experienced. For instance, if someone is scared of needles, it may have been because they had a bad experience with it as a child, thus causing a phobia. This I known as classical conditioning – learning by association; learn to associate a certain response with a certain stimulus.However, even behaviourists do take into account that some behaviour are not learnt, but are instinctive instead. This is called unconditioned response. This contains of instinctive responses such as sexual arousal and anxiety. Unconditioned responses are triggered by unconditioned stimulus. They can be objects or events that naturally cause the reaction such as stimulating genitals might cause arousal or a threat may cause us to be anxious. Yet, sometimes these responses happen in the presence of a neutral stimulus. Neutral stimuli don’t cause a reaction.However we assume it does when we experience something good or bad. For example if a person ate chips and got sick -vomited, they may assume chips cause a bad reaction every single time. This is known as classical conditioning. Therefore each of the neutral stimuli is then described as a conditioned stimulus because they trigger a learnt response. A reaction to a conditioned stimulus is called a conditioned response. Also operant conditioning is a term used by the behaviourist to describe learning by consequences. If the consequences of an action are worthwhile we learn to do them again.Yet if the consequences are not good, we are likely not to do it again. Atypical behaviours are learnt in the same manner as typical behaviours. Atypical behaviours are just more uncommon cases of classical cond itioning. One of the criticisms of this theory is that it ignores the mind and the thinking behind it. For example if we two people got robbed at night, one is likely to think of it as one time incident and forget about it- rational. Whereas the other will think it will happen many times again – irrational. Thus causes to develop a phobia of dark. Different people have different outlook to the event.

Why Deflation Doesnt Happen During a Recession

When there is economic expansion, demand seems to outpace supply, particularly for goods and services that take time and major capital to increase supply. As a result, prices generally rise (or there is at least price pressure), particularly for goods and services that cannot rapidly meet the increased demand, such as housing in urban centers (relatively fixed supply), and advanced education (takes time to expand/build new schools). This doesnt apply to cars because automotive plants can gear up pretty quickly. Conversely, when there is an economic contraction (i.e. recession), supply initially outpaces demand. This would suggest that there would be downward pressure on prices, but prices for most goods and services dont go down and neither do wages.  Why do prices and wages appear to be sticky in a downward direction? For wages, corporate/human culture offer up a simple explanation: people do not like to give pay cuts... managers tend to lay off before they give pay cuts (though there exist some exceptions). That said, this doesnt explain why prices dont go down for most goods and services. In  Why Does Money Have Value, we saw that changes in the level of prices (inflation) were due to a combination of the following four factors: The supply of money goes up.The supply of goods goes down.Demand for money goes down.Demand for goods goes up. In a boom, we would expect that the demand for goods to rise faster than the supply. All else being equal, we would expect factor 4 to outweigh factor 2 and the level of prices to rise. Since deflation is the opposite of inflation, deflation is due to a combination of the following four factors: The supply of money goes down.The supply of goods goes up.Demand for money goes up.Demand for goods goes down. We would expect the demand for goods to decline faster than the supply, so factor 4 should outweigh factor 2, so all else being equal we should expect the level of prices to fall. In  A Beginners Guide to Economic Indicators we saw that measures of inflation such as the Implicit Price Deflator for GDP are pro-cyclical coincident economic indicators, so the inflation rate is high during booms and low during recessions. The information above shows that the inflation rate should be higher in booms than in bursts, but why is the inflation rate still positive in recessions? Different Situations, Different Results The answer is that all else is not equal. The money supply is constantly expanding, so the economy has a consistent inflationary pressure given by factor 1. The Federal Reserve has a table listing the M1, M2, and M3 money supply. From Recession? Depression? we saw that during the worst recession America has experienced since World War II, from November 1973 to March 1975, real GDP fell by 4.9 percent. This would have caused deflation, except that the money supply rose rapidly during this period, with the seasonally adjusted M2 rising 16.5% and the seasonally adjusted M3 rising 24.4%. Data from Economagic shows that the Consumer Price Index rose 14.68% during this severe recession. A recessionary period with a high inflation rate is known as stagflation, a concept made famous by Milton Friedman. While inflation rates are generally lower during recessions, we can still experience high levels of inflation through the growth of the money supply. So the key point here is that while the inflation rate rises during a boom and falls during a recession, it generally does not go below zero due to a consistently increasing money supply.   In addition, there may be consumer psychology-related factors that prevent prices from decreasing during a recession- more specifically, firms may be reluctant to decrease prices if they feel like customers will get upset when they increase prices back to their original levels at a later point in time.