• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

GCSE: Patterns of Behaviour

Browse by
Rating:
4 star+ (13)
3 star+ (49)
Word count:
fewer than 1000 (333)
1000-1999 (658)
2000-2999 (391)
3000+ (277)

Meet our team of inspirational teachers

find out about the team

Get help from 80+ teachers and hundreds of thousands of student written documents

  1. 1
  2. 2
  3. 3
  4. 4
  5. 56
  1. Marked by a teacher

    How the Concentration of Acid in a Solution affects the Rate of Reaction

    3 star(s)

    (Theory explained thoroughly in conclusion). Preliminary Test: Before conducting the experiment I had first to determine the ratio of Hydrochloric Acid and Sodium Thiosulphate that give the best range of results. We observed how long it took 5cm� of Hydrochloric Acid (in different concentrations) to react with 10cm� of Sodium Thiosulphate. This was very slow and it was still possible to see the "X". I repeated this 3 more times increasing the volume of Sodium Thiosulphate but keeping the volume of the Acid the same.

    • Word count: 1432
  2. Marked by a teacher

    Rates of reaction throughout the year

    3 star(s)

    Information on acid rain: Fossil fuels give off a small amount of Sulphur, S. Acid rain will also be a mix of sulphurous and sulphuric acid and a small amount of nitric acid. The statue is reacting with sulphuric and sulphurous acid. The sulphur is coming from fossil fuels. Equation of acid rain: S+02 S02 S02+H20 H2S03 My Prediction: I predict that in summer, it will corrode more because the temperature is higher. When the temperature is higher more reactions will occur because of the increase in collisions.

    • Word count: 1711
  3. Marked by a teacher

    How dose temperature affect the rate of reaction between magnesium and hydrochloric acid.

    3 star(s)

    This is to suture the acid and make sure that magnesium is always covered in acid. This will so make sure that the magnesium is in contact with unreacted acid this will make the reaction faster and I will be able to do more repiates. The second problem was that the magnesium had the top layer oxidised. This means some magnesium has already reacted with the oxygen in the air. I needed to depose of this because otherwise it could have effected the speed of the reaction, I am sur that the magnesium oxide reacts differently with hydrochloric acid.

    • Word count: 3900
  4. Marked by a teacher

    The effects of concentration on reaction rates

    3 star(s)

    area where there aren't hydrogen or chlorine atoms, so the collision rate is likely to be higher. Prediction: I predict that the higher the concentration of HCl, the faster the reaction will take place. As I said in the introduction, the atoms will find it easier to react (collide) with the magnesium, as there would be more atoms to react with it. I think that the graph I will draw from these results will show proportionalities between the concentrations of the acid, and the time taken to react. However, the table wont show proportionalities, because it won't take into account the different differences between each concentration.

    • Word count: 2300
  5. Marked by a teacher

    Rates of Reaction

    3 star(s)

    Also the rate of reaction is halved each time, there for it will take double the time to react. Although the particles may hit each other, they need to have hit each other hard enough to reach activation energy. It is when they reach activation energy is when they react with each other. The rate of the reaction is when more successful collisions happen per second. The reason why the rate of reaction is faster when the solution is more concentrated is that the ions are closer together in a concentrated solution.

    • Word count: 1324
  6. Marked by a teacher

    Rates of Reaction

    3 star(s)

    This increases the number of collisions. Solids with a smaller particle size react more quickly than solids with a larger particle size: Temperature If the temperature is increased the reactant particles move more quickly. The particles collide more often and more of the collisions result in a reaction, so the rate of reaction increases. At a lower temperature, the number of collisions is lower because the particles are moving more slowly. In addition, when a collision occurs there is less chance of a reaction-taking place because the movement energy in the particles is less.

    • Word count: 1889
  7. Marked by a teacher

    Investigating the Effect of Concentration on the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate

    3 star(s)

    - using just 5cm� of 0.1M sodium Thiosulphate for the weakest solution simply took too long as it was so weak, so I decided to alter the concentration for the main experiment. I will change the concentration from 0.1M to 0.15M, so it will not take so long. Method I will need to do five tests, all of different concentrations. The concentration table below will show how much water and Sodium Thiosulphate will be needed per solution: Solution No. Volume of Sodium Thiosulphate (cm�)

    • Word count: 1290
  8. Marked by a teacher

    Chemistry copper sulphate and zinc

    3 star(s)

    This is because heat can be lost quickly through the sides of a glass beaker, and by using a polythene cup; I hope to cut this heat loss down. I will use 25ml of copper sulphate solution and 0.8125 grams of zinc in each experiment. I manage to work this out using Avogadro's theory of moles. First, I had to work out how many moles there are in 25ml of copper sulphate at 0.5M. We need to convert the 'ml' units into 'dm' units.

    • Word count: 1220
  9. Marked by a teacher

    The Effect of Concentration on the Rate of Reaction between Hydrochloric Acid and Calcium Carbonate (marble) Chips.

    3 star(s)

    Chemical reactions can also occur at diffenet speeds depending on their factors and their enviroment. In this reaction the factor that will be investigated is the different concentrations of hydrochloric acid on small marble chips, and how fast its rate of reaction is in producing a certain amount of carbon dioxide. From research gathered and previosuly conducted experiments, it has been established that the higher the amount of concentration there is in each solution the faster the rate of production. I have decided there will be five concentrations tested, 100ml3, 75ml3, 50ml3 25ml3 and 0ml3; each test will be repeated twice to create an average for each experiment, to guarnatee all the results are correct and are similar to one another to prevent anomalies.

    • Word count: 4294
  10. Marked by a teacher

    In this project I am going to investigate rates of reaction of an indigestion tablet when added to hydrochloric acid. The variable I am going to use will be the temperature of the acid.

    3 star(s)

    and have more chance of colliding with each other. Also, there is a greater chance of effective 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.

    • Word count: 4782
  11. Marked by a teacher

    How concentration affects rate of reaction

    APPARATUS: - Conical flask (250cm3) - Beakers (large and small) - Large basin with water - Delivery tube & stopper - Measuring cylinders (large and small) - Clamp stand - Electronic balance - Stopwatch - Safety glases - Spatula - Pipette - Calcium carbonate - Hydrochloric acid (2M) - Plastic tray METHOD: 1. First collect all of the apparatus and set up the most important elements as in the image (you can use a clamp stand to secure the cylinder).

    • Word count: 677
  12. Marked by a teacher

    To monitor the rate of reaction we measure how a product changes with time, I am going to collect the gas given off when magnesium reacts with different concentrations of hydrochloric acid at a given time.

    I have chosen these times because I only need three results as I am going to measure the initial rate of reaction and not the average. I will repeat each experiment so that my results are reliable and reproducible. * Hypothesis I predict that as the temperature increases, the speed of the reaction will increase therefore the gas will be produced faster. I believe this because most chemical reactions happen faster when the temperature is higher. At higher temperatures molecules mover around faster, which makes it easier for them to react together.

    • Word count: 2493
  13. Free essay

    Rate Of Reacion

    One example is temperature. There is a quicker reaction as higher temperate create more energy, therefore creating more collisions to be able to have a reaction. For our experiment we needed to increase the number of successful collisions between the reacting particle molecules. Temperature would increase the collisions taking place, however, for our experiment we did not use temperature to test the rate of reaction as it makes it very difficult, because it makes it hard to get reliable results as temperature can change very quickly.

    • Word count: 2338
  14. Free essay

    Chemistry Rate of Reaction Coursework for Calcium Carbonate and Hydrochloric Acid

    The gas syringe has marks along its length which allow the volume of collected gas to be measured. The increase in volume can be timed, and a graph of volume against time can be plotted. This shows the rate of the reaction. Equipment: a gas syringe, rubber bung, conical flask, stand, clamp, 25ml hydrochloric acid, 2g medium sized calcium carbonate pieces, and a stopwatch. Method; 1) The gas syringe should be set up horizontally by an attachment to the stand, by the clamp. The tubing should be positioned well on the rear end of the gas syringe. 2)

    • Word count: 1805
  15. Marked by a teacher

    rates of reaction

    We did this by measuring out the same volume of acid and add it to a measuring cylinder. We used 20 ml of acid. And we used the same weight of marble chips. But had them in three different sizes, Powdered, Large Chips and small chips. KEY 2Hcl + CaCo3 CaCl2+H2o+Co2 aq : aquaris (aq) (s) (aq) (l) (g) S: solid l: Liquid g: Gas We poured the acid into the measuring cylinder and got the stop watch ready and the right weight of marble set.

    • Word count: 322
  16. Marked by a teacher

    Coursework Rates of reaction

    - Distilled water - Delivery tube - Bowl - Conical flask (100ml) - Beaker - Measuring cylinder (100 cm3) - Stop watch - Balance - Clamp - Clamp holder - Safety Glasses Method: 1. Collect all materials 2. Fill the bowl and the 100 cm3 cylinder with water 3. Holding the end so that the water doesn't go out, turn the cylinder upside down and place it down the bowl, keeping it still with the clamp, put the delivery tube at the hole of the cylinder 4.

    • Word count: 756
  17. Marked by a teacher

    The aim of this investigation is to investigate the rate of reaction of magnesium (mg) with Hydrochloric acid (HCl). After studying the availability of equipment I have chosen to investigate how the temperature can affect the rate of reaction.

    Usually, a rise of 10OC will double the rate of reaction. Chemical reactions take place by chance. Particles need to collide with enough velocity so that they react. As the temperature is increased the particles move faster since they have more energy. This means that they are colliding more often and more of the collisions have enough velocity to cause a reaction. Since there are more collisions the chemical reaction takes place faster. To help me gain better knowledge about the investigation I have found out some scientific information relating to the experiment of 'rates and reaction'.

    • Word count: 2103
  18. Marked by a teacher

    rates of reaction

    Lastly a catalyst is a chemical what we add what will increase the surface area, so there is more chance of collisions to take place, at the end of the reaction the catalyst can be removed. The reaction of the collision theory: Sodium thiosulphate+hydrochloric acid sodium chloride+ sulphur dioxide + water +sulphur My prediction I predict that as I increase the concentration of the sodium thiosulphate the rate of reaction will increase. This is because the number of particles will increase meaning more chance of collision further resulting in the rate of reaction to increase.

    • Word count: 770
  19. Marked by a teacher

    How concentration effects the rate of a chemical reaction

    Using 30ml of 2M acid, 3g of each of the particles had filled the measuring cylinder with hydrogen gas, the large bits filling it slowest and the powder filling it fastest. Equipment: Gas Cylinder Conical flask with rubber tube 50ml measuring cylinder 10ml measuring cylinder 6 100ml beakers Pipette Balance Stop clock Calcium Carbonate (large marble chips)

    • Word count: 389
  20. Marked by a teacher

    Chemistry Coursework - How the concentration effects the rate of reaction between sodium thiosulphate and hydrochloric acid.

    As the concentration is higher this means that there are mare sodium thiosulphate molecules to react with HCl molecules. As the HCl will be kept as a constant there will always be the same amount of molecules but as the sodium thiosulphate is being watered down this means that there will be less molecules for more successful collisions. What happens is the molecules in the two solutions mixed will be "free" as a figure of speech until they collide with another molecule that it can react with and the end result should be a yellow precipitation to be formed.

    • Word count: 3859
  21. Peer reviewed

    Rates of Reaction

    5 star(s)

    The rate of reaction is the speed of the reaction. It is how quickly a reaction takes place. There are three ways of measuring the rate of reaction. These are 1) Precipitation - this is when a product of the reaction is a precipitate which clouds the solution. Observe a marker through the solution and measure how long it takes for it to disappear. 2) Change in mass (usually a gas given off) - any reaction that produces a gas can be carried out on a mass balance and as the gas is released the mass disappearing is easily measured.

    • Word count: 5142
  22. Peer reviewed

    Temp labreport

    5 star(s)

    Therefore, increasing the temperature increases the energy between the particles and makes them move around a lot more and collide more often. Hypothesis: - The rate of reaction has a positive relationship with the temperature of the Hydrochloric Acid. Apparatus:- 1) Test tube 2) Rubber tube (a.k.a. delivery tube) 3) Measuring cylinder X2 [1-10ml, 1-100 ml] 4) Rubber Bung 5) Stopwatch 6) HCL - 150ml 7) 5x 3 cm of magnesium ribbon 8) Trough full of water 9) Beaker - 400ml 10)

    • Word count: 851
  23. Peer reviewed

    Study on food colourings

    5 star(s)

    as Caramel colouring which is used is cola products, which is found in caramelised sugar and Annatto which is made from the seed in a tropical tree and used to create a reddish orange dye for food. Also natural food colourings can be made from many plants other plants. Natural colourings tend to be a lot more healthy and not such a threat to your health as some artificial food colourings. Health risks of artificial food colourings Different food colourings have different effects.

    • Word count: 1523
  24. Peer reviewed

    My experiment will be conducted to find out at what concentration does sodium thiosulphate with hydrochloric acid have the most reaction and how the concentration generally affects the rate of reaction.

    4 star(s)

    Measure temperature of room 4) Put a bold 'X' beneath the THIO beaker then pour HCL and press 'GO' on the stopwatch. 5) Press 'STOP' when solution goes cloudy and 'x' disappears. 6) Record results 7) See if it takes longer for the dilute solution to react. 8) Spot trends. Initial Method Na2S2O3 (aq) + 2HCl (aq) SO 2 aq) + S(s) + H2O(l) + 2NaCl (aq) My prediction: when the concentration of sodium thiosulphate is increased, the time taken for the reaction to take place will also decrease because the water molecules would delay the collisions between sodium thiosulphate and hydrochloric acid.

    • Word count: 2005
  25. Peer reviewed

    Formula of Magnesium Oxide

    4 star(s)

    mass of crucible and magnesium after heating: 15.18g ? mass of magnesium before heating: 0.90g ? mass of magnesium oxide: 0.97g ? mass of oxygen: 0.07g Changes occurring during the reaction: � Magnesium stripe glowed and burned bright orange � Sparks appeared on the surface of the magnesium stripe � Started to shrink and change into white powder form but still glowing This shows that magnesium has reacted with oxygen to form magnesium oxide, a white powder. Appearance of contents at the end of experiment: � White powder � Not in a shape of a coil Number of moles of magnesium and oxygen in magnesium oxide: moles = mass moles = mass molar mass molar mass

    • Word count: 847

Marked by a teacher

This document has been marked by one of our great teachers. You can read the full teachers notes when you download the document.

Peer reviewed

This document has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the document page.

Peer reviewed

This document has been reviewed by one of our specialist student document reviewing squad. Read the full review under the document preview on this page.